The Corrello Blog

Thoughts on Scrum and Agile with Trello

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What labels are in your Trello backlog and how long will it take to complete those cards?

The latest (small) update to Corrello adds the ability to see what cards are in your backlog based on both the list they are in and the labels they have assigned.


For the labels you can see how many cards with each label are on the backlog, how many are currently in progress and an estimat of how long it would take to complete them all. This can be especially useful if you use labels in Trello to group cards into Epics (or other collections of cards). This way you can see how long it would take to complete an individual Epic assuming you focused the efforts of the team on that one piece of work.

For the lists you can see how many cards are in each and an estimate of how long it will take to complete all the cards in that list assuming you focused all your efforts on completing those cards. This can be useful for Kanban teams so you can be sure you have enough work ready for the team to work on, as well as an estimate of the size of the outstanding backlog. If you are using lists to store upcoming releases this also gives an idea of how long it will take to complete each upcoming release, particularly useful in combination with the project burnup charts in Corrello.

You can check out the new features in your dashboards here. If you don’t have a Corrello account you can check out all the features and try out our 14 day free trial here.

In the screenshot above we are reporting estimates in terms of cards and sprints to complete the work. For Kanban teams this would be shown in weeks and for teams using Story points this would be reported in terms of points rather than cards.

This is the second addition to the backlog tab in recent months, after the inclusion of the Burnup charts previously. There should be more improvements coming here in future, if you have suggestions please do comment below or drop us an email 🙂

Slack + Trello + Corrello = Trello Burndowns, CFDs and stats in your Slack Channels

Corrello + Slack = Burndowns, CFDs and Stats for your Trello boards in Slack

Apologies for the long title, there’s a lot of services getting tied together in this update!

I just launched the Corrello Slack app, you can try it out here. If you’re not familiar with Corrello, it’s a dashboard for agile teams using Trello. You can use it to see Burndown charts, release forecasts, cumulative flow diagrams, cycle time and much more for your Trello boards. The Corrello Slack app gives you access to some of those features directly in your Slack channels.

The Corrello Slack app adds these three commands to your Slack channels:



The burndown command lets you get the latest burndown chart from one of your Corrello dashboards. This is the burndown for the current sprint as is visible to everyone in the channel, great for standups!



The /cfd command shows you the last 2 weeks from the Cumulative flow diagram for one of your dashboards. Clicking the link in the title takes you to the full CFD where you can choose what date range you want and turn lists on and off.



The stats command pulls the stats for the latest sprint (or week, if you’re not using sprints) for one of your dashboards. These are all color coded the same as they are in Corrello, clicking on them takes you directly to the list of matching cards. The stats displayed are the ones you have set up for that dashboard, they can include counts of cards (or points if you’re using them) completed, due, overdue or with specific labels (ie ‘bugs’).

That’s all folks! If you’ve already got a Corrello account you can add the Slack app here here. If you don’t have an account yet you can sign up for a free trial here.

$0 to $1k MRR in 57 months

Late last year I finally passed the (at least psychologically) significant $1k MRR mark on a business I’d bootstrapped solo. Since then things have picked up even more but I wanted to go back and write this post about the journey from $0 to $1k.

In case it’s not obvious from the title, this isn’t one of those exciting “I built something in a weekend, launched it and paying customers rained from the skies” posts. Not to malign those, I enjoy them as much as the next guy. But, that’s not been my experience or the experience of anyone else I know. This post is about the journey over 4 years to go from launching ideas that had little chance of success, to launching Corrello (Dashboards for agile teams using Trello, if that’s you check it out :)) which is showing some signs of being a success. I wanted to write something for those of us who struggled to level up their skills and knowledge by failing over and over. I want to focus on what I learned in the 4 years before I started work on my latest venture, not on the tactics I’ve learned since. Because I think there is value on those lessons, and without learning those I wouldn’t have got to $1000 MRR and beyond. I’m not going to cover everything, just the highlights. And I’ll try to keep things succinct. If you’re a software developer or budding entrepreneur who wants to launch their own software product there should be value in the story below.

57 months to go –

I registered the domain name on March 11th 2011. Jobs Tractor got taken down last March and never made me any money. That was the first time I actually launched one of my side projects so I’m taking that as the slightly arbitrary start date of my journey to $1000 MRR.

I started Jobs Tractor with a simple idea “Top blogs like Joel on Software etc. make good money advertising jobs, so what if a load of smaller sites ganged together and did the same?”. The plan was to offer an alternative to advertising, and by aggregating readers from multiple blogs we could reach a similar audience to those larger sites. I built the site out, including heavy load testing of the endpoints which would be used to get the jobs to display on people’s blogs. I think I actually built some stuff to get the most relevant jobs based on the user’s location from their IP address. Obviously I had all the user admin, the ability to post and edit jobs and paypal (bleargh!) integrated to take payments. I also had to learn how to host and deploy everything as this was the first side project I’d actually put out into the wild. All this took several months of evenings and weekends. I honestly can’t remember what I did to ‘launch’ the site, I probably just put it up and posted it to HN. No one came, no one cared.

Whilst building Jobs Tractor I’d come across a couple similar services which had closed their doors or pivoted some time ago. One still had a list of the blogs they published jobs on. I started looking for contact details and emailing the people behind those blogs. The bloggers who got back to me told me that the service never really worked for them and that they did a lot better from advertising anyway. Which put an end to that whole plan! That was the last time I invested that much effort in something without getting some feedback on the idea first. Memories of weekends sat at home working while my friends (and girlfriend, now wife) were out somewhere nice in the sun inoculated me against building too much functionality without first getting some input from potential users.

A few months later I was messing around with Mongo, Node and the Twitter API, trying to find what programming languages people were hiring for near me. I had a simple search to get tweets which looked like job posts, filtered out jobs boards and recruiters, did some simple classification to remove tweets which weren’t jobs and worked out where the job was based and the programming languages involved. This turned out to be a potentially useful way of finding people hiring developers directly via twitter (minus the recruiters and job boards spam) so I incorporated some Javascript which would identify where a user was geographically, and then had the site load the most recently posted jobs close to them. I posted this new site to HN, hit the top of the front page for several hours and had to have a serious sit down to relax myself! I’d included the ability for people to give me their email addresses in return for a weekly email with jobs for their location. Having learned my lesson about writing code no one was going to execute I’d not actually written anything to send the emails out. I spent the weekend happily hacking that together in time for the first batch of emails to go out on Monday.

Next I started emailing news sites trying to get some coverage for Jobs Tractor. This was hard work at first and I spent far too long hemming and hawwing before sending each email. It’s strange to think how shy/nervous I was about sending those emails back then. But you only get past that sort of roadblock by doing the thing you’re nervous about and I can honestly say it’s not something which gives me pause for thought nowadays. Lesson learned here? If something needs to be done but feels unnatural just find a way to get it done. Repeated exposure will make it easier over time.

I spent odd bits of time over the next couple of years trying to get some revenue from Jobs Tractor. At first I thought the users I had would be useful in attracting employers but in reality I had probably one or two people in dozens of cities around the world so any employer trying to post a job was unlikely to find someone local with the skills they needed. Possibly I could have picked a location which I seemed to have a lot of devs in and focus my efforts there, including a lot of personal out reach to employers. This may have worked but I wasn’t ready for that kind of approach at the time.

Jobs Tractor remained up and working until early last year when I decided to kill it to save load on my server. I learned a few things from the experience, but the main takeaway for me (apart from not wasting time on code no one will use) was to build something people can get utility from without needing to have other people on the site. What I’d built was a two sided market place. If you’re no good at marketing, a two sided market place just means you shot yourself in the foot twice. Two sided market place ideas always sounds great at first, and once you’re at scale the are. But to get there you need to attract each side of the market. And just because you have one side doesn’t mean the other side will magically appear. You still need to tell them about it. Beware ideas which only sound interesting once you’ve got 1000s of users on your site, unless you have a clear plan on how to get those early 1000s interested.

42 Months to go –

The rules so far:

  1. Don’t spend ages building a load of highly polished functionality no one will ever see.
  2. Build something user 1 can pay for and get use from without needing other people on the site.

You may well have heard of Patrick McKenzie and his original business selling bingo cards to school teachers. Well, I did some googling and checked search volumes for a similar niche selling software which would generate word searches. It seemed OKish, with a bunch of crappy sites, some reasonable search volume and low competition on those keywords. I put up a site using a landing page generator, when users clicked the buy button they went through to a form which said we were coming soon and asked for an email address. This collected a bunch of email addresses and convinced me it was worth pushing ahead. I wish I could remember numbers here but I can’t so just trust me it seemed like it might be a sensible idea, although I was probably willing it to be if I’m honest. The site didn’t take long to build and looked like it was from sometime slightly after the late 90’s, I was pretty pleased with it! I deployed it, fired up adwords and started thinking about content marketing and SEO. In the end I ran it for a while without getting any actual paid customers. People were checking it out but didn’t want to pay when I asked them to subscribe to the service. I dropped the price, and dropped it again. In the end I was almost giving it away ($19 lifetime subscription) , and even if I could get a few signups it was going to be a long way off being a significant amount of monthly revenue.

What did I learn here? This was one of many small sites I built and deployed fairly quickly. Ultimately I learned I wanted to build a SaaS rather than go after one off sales, and that I needed to target people who had a problem big enough they were going to pay serious money ($30/month or more) to have it solved. I also learned something (but not enough) about contacting your early users. I collected those first batch of email addresses but did nothing to get in contact with them until I launched.

22 Months to go –

The rules:

  1. Don’t spend ages building a load of perfect functionality no one will ever see
  2. Build something user 1 can pay for and get use from without needing other people on the site
  3. Build something worth $30/month or more

Hulimail came to me while reading up on marketing technologies. In the preceding few years I’d started to develop an interest in marketing (if not any real skills). I was reading an article on the FullContact blog one night about how Maptia had jerryrigged something to send them an email with research on new signups to their prelaunch mailing list. The following day I was up early, coding for 12 hours straight (happy pre-parenthood times when I had 12 straight hours free on a Saturday :)). On Sunday I decided to rein myself in from coding too much before some validation and focused on getting a landing page up instead. I started collecting email addresses and posted the site to betalist. Someone also posted the pre-launch site to ProductHunt which got me another 100 or so email addresses.

As I built I posted updates to the mailing list and heard back from people occasionally. I started onboarding people individually but didn’t really get anyone that interested in the solution I was offering. I did get a few people signing up but for the most part they were interested in free access in return for ‘help developing the product’ or in one case some actual promotion to their sizeable audience. I took these offers as I wasn’t really a user of the tool myself and felt I needed people’s feedback. In retrospect I should have pushed for people to pay, and if they weren’t willing I should have looked for someone who was. Not doing so early on let me keep working on something which I think ultimately didn’t have a market I could find economically.

If I learned a lesson here it was about validation, and that people wanting to use your software for free isn’t enough (it’s something, just not enough). The interest in Hulimail wasn’t from people with a problem they desperately needed solving, but something they’d like solved if it was cheap/free to do so. I also learned to consider the market. The people interested in Hulimail were mostly trying to avoid spending money somewhere else, this doesn’t make for a lucrative customer base.

10 Months to go – Corrello

The rules:

  1. Don’t spend ages building a load of perfect functionality no one will ever see
  2. Build something user 1 can pay for and get use from without needing other people on the site
  3. Build something worth $30/month or more
  4. Build something to solve a problem people are willing to pay for
  5. Charge early, and beware products aimed at people resistant to paying for things

I won’t say much about building Corrello, except that I think the final piece of the puzzle fell into place when I had a chance conversation with Josh Pigford (of BareMetrics fame) briefly after launching my MVP. He pushed me to contact everyone who had signed up and to have a conversation with them to understand what problems they were having with reporting from Trello. Rather than assume I knew what I should build I should start by finding out as many people’s problems as possible. This was something which was missing from my previous efforts. I’d always considered the pre-launch mailing list as a group of people interested in what I was building. Instead, I started to view them as people with problems in roughly the area I was working in, who I should talk to and understand those problems so I can decide exactly what to build. This led to a change of direction and ultimately a fairly well defined market to go after. This is an important lesson for a lot of entrepreneurs I think as it’s easy to fall in love with your idea. You need to talk to anyone interested enough to give you their time and find out what their problems actually are.

If you’d like to hear more about my journey over the last year you should check out my interview on the excellent Britstrapped podcast.


The rules (for me YMMV):

  1. Don’t spend ages building a load of perfect functionality no one will ever see
  2. Build something user 1 can pay for and get use from without needing other people on the site
  3. Build something worth $30/month or more
  4. Build something to solve a problem people are willing to pay for
  5. Charge early, and beware products aimed at people resistant to paying for things
  6. Your pre-launch list (and early customers) are probably interested in something other than (but close to) what you are building. Success comes from finding out what that is

It’s been a fun/hard/exciting/depressing few years working on this stuff. It’s been a slog at times, but I’m glad I did it. I don’t think you can really succeed at anything meaningful without failing a bunch first. If you’re in a similar place to where I was, keep at it and try to make sure you don’t make the same mistake twice.

The only other thing I’d say is that if you’re on an agile team using Trello you should check out Corrello :).

How to add charts to Trello

Trello is great, but as a project management tool it can be a little bare bones. In this post we’ll look at a few ways you can add some different charts in to your Trello boards. The simplest is to get some existing plugins and power-ups to do the job for you. The next option is to use the API to add some totally custom charts that you can configure however you want (assuming you’ve the skills and the time).

Plugins and power ups to add charts to Trello

There are a bunch of different options here depending on your needs. We’ve got options for old school PMs looking for Gantt charts, agile teams looking for Burndown charts and Cumulative flow diagrams and for those of you who need to keep an eye on the time there’s great options around time tracking too.

Gantt charts

I’ll freely admit that Gantt charts are not my first port of call when looking to add charts to my projects. However, they serve a purpose and for some people they are the key chart that they need. The best place to get started adding Gantt charts to Trello is with a tool called Elegantt which works as a chrome plugin or a Trello power up (for business class users).


Elegantt also adds some nice features on top of Trello such as task dependencies and milestones (ie the date of an upcoming launch). If Gantt charts are your thing you should give it a go.

Scrum and Kanban charts

Naturally I would say this as I built it but if you’re looking to add charts for agile teams the best option is Corrello. It has a mix of features for both Scrum and Kanban teams, so you can get your sprint Burndown charts for your Scrums:


And for Kanban teams there’s Cumulative flow diagrams:


As well as Cycle time charts (and cycle time percentile ranges):


These and other charts are all available in Corrello, and for Trello business class users you can also install the Corrello power up to get the first two directly in your Trello boards.

The main alternatives to Corrello would be Burndown for Trello (here) for burndown charts and this site for CFD charts.

Time tracking charts

Harvest is a tool which gives you visual reporting to keep track of project progress and break down the hours that went into that project. It’s a great looking tool with plugins for a lot of project management tools including Trello. With their Chrome plugin or Trello power-up you can start and stop progress on individual cards directly from Trello. You can then keep track of the time spent on projects and tasks in Harvest. If you’re interested in tracking time spent and progress down to the hour against a time budget Harvest is a nice option.


Simple charts (counts of labels, overdue cards etc)

Sometimes all you want to know is how much work you and your team mates are getting done each week, and a few other simple counts (cards labeled as ‘bug’ or past their due date). This would actually be one of the simplest to build your own dashboard for if you wanted to use the API. If you’d rather someone else do it I’m going to have to plug Corrello again I’m afraid.


Using the API to create custom charts

I’ve written a little about creating your own dashboards using the Trello API previously. That should serve as a good starting point to get to grips with the API and put together a quick POC for your charts. The next step is to pick your visualisation library. For simple charts I’d suggest HighCharts which is what I use for all the charts in Corrello, and if you need some more complex charts check out d3.js.

An alternative approach if you want to avoid coding everything up yourself is to pull the data into google sheets. There is a write up on that approach here. That still requires some coding but it saves you creating the charts yourself as once your code has pulled the Trello data into google sheets you just manipulate it and create your charts there.


That’s it. My top picks for plugins again in case you wanted the links are

  1. Elegantt – for gantt charts
  2. Corrello – for agile charts
  3. Harvest – for detailed time tracking

Project (or Release) burnup charts for your Trello projects

I’m excited to announce the latest big addition to Corrello – Project (or Release) Burnup charts.

This is a new chart in Corrello which tracks to the total work in a project over time vs how much of that work has been completed.


The release burnup chart shows you three lines

  1. The red ‘total effort’ line plotting how much work has been in the release over time.
  2. The blue ‘completed’ line showing how much of that work has been done.
  3. The dashed blue ‘forecast’ line showing when you will be complete assuming your current velocity is maintained.

The total effort line is useful to visualise the impact of scope changes. If you’ve had to agree a load of new work as part of a project, this can be a nice way to show the impact of that on the schedule. The blue line then burns up towards that total as cards are completed over time and the dashed forecast line shows how things are expected to progress.

You also get some stats on how much work is remaining, your recent velocity, how long it will take to complete the work and how much of the work has been estimated. You can also drill down and see the individual remaining cards along with estimates of when they are likely to get done.

These charts can be enabled for any of your dashboards right now. If you have a Corrello account you can login here. If you don’t you can start a free trial here.


Burndowns and CFDs in your Trello boards – It’s the Corrello Power-Up!

Trello just announced their power-ups platform and here at Corrello we’re announcing our Corrello power-up for Trello. This is something we’ve been working on with the team at Trello since late last year, so it’s great to be able to talk about it at last!

The Corrello power-up is one of the first power-ups to be developed by someone other than the Trello team. It adds a Corrello button in the top right of your Trello board. Clicking on that gives you options to see a cumulative flow diagram, burndown chart or the full dashboard for that board. There are more details on enabling and using the power-up here.



I’ll be adding more features in future, let me know what you want to see.

How much automated testing is enough automated testing?

I had been a proponent of automated testing for a long time before we really adopted it at my last company. It was one of those things people wanted to do but never felt they had the time for. When we all actually started writing tests for our code was at the start of a new project, a rewrite of an existing product. The fact that on day one we could create and maintain 100% test coverage was a strong driver in writing more tests. I knew that code coverage was an imperfect metric, but it’s so easy to track it’s natural to use it. This is, I think, the key problem with automated testing that leads people to think that 100% is what they should be aiming for. When measuring coverage is so easy, and 100% coverage of your first piece of code is possible it’s natural to try and maintain that.

I think a lot of people who haven’t really considered what tests they should write also assume 100% coverage is what they should aim for. This seems to be the default opinion people come to the question with, if they even realise that there is a question to be asked.

Why 100% test coverage is actually a bad goal

I believe you should definitely not try to write “as much automation as possible” or fall into the common trap of thinking that 100% automation is an ideal to be aimed for.

Writing automated tests takes time, running them takes time and maintaining them takes time. Imagine for the sake of argument that only 50% of your tests are useful. In this case you have wasted time writing the remaining 50%. You need to wait for the other 50% to finish executing to get the results of the useful ones. And, you need to spend time maintaining them. Most of the work in software development is in the maintenance, not in originally creating the code. Less code is a laudable aim, this also applies to your tests.

So, you may well ask, how can we decide if we’ve written enough tests for a piece of code or not? Which is lucky because that’s what I’m going to tell you next :).

How to know if you’ve written enough tests

I propose splitting your tests into four groups:

  1. Core functionality of your app. If your app is a website monitoring tool then this would probably be any alerts which need to fire if a site has problems. If these go wrong your app isn’t serving its core purpose so having automated regression tests to run on every code change makes sense.
  2. The basics (often called a smoke test). For example you could use Selenium to click all the links to navigate through a web app and make sure the server responds with a 200 for each page. Note, I don’t mean checking the content of the pages, just that you can navigate the app and it’s not obviously broken. These tests ensure any manual testers aren’t having their time (and morale) wasted with obviously broken builds.
  3. Anything fragile which is likely to break. This is hard to define for new code, but if you’re working on some legacy code which you know to be bug prone then building tests around any changes you make is a good way to build towards being able to refactor more safely.
  4. Things the developers wanted to automate because it was easy to do. Sometimes it makes sense to add tests while you’re building something, that shouldn’t be discouraged.

By structuring your test cases along the above lines, when one fails people know why it was created. If it is the test that is wrong and not the code under test they should understand why it’s important to fix the test rather than delete/disable it. Or if it’s not important to maintain, they can delete it if that’s what they want to do. Note, I would suggest explicitly laying out your code using these four categories so anyone reading it knows which group the test is in.

Code review of the tests then becomes easier as someone can look at the functionality under test and form their own opinion about the tests which should appear in each category. This is where a code coverage report is useful, a scan through that as part of a code review may show something up which you think should be tested.

You can obviously adapt the above to your own needs, but I think the categories are vague enough they would suit most teams.

Agile team? Using Trello? You should check out Corrello – Dashboards for agile teams using Trello.

How to create recurring tasks in Trello

Update: If you are looking for a simple way to create recurring tasks and whole lot of other cool automation within Trello you should check out Butler bot.

Something I’ve seen over and over again is people creating recurring tasks in Trello. There’s a joke somewhere in that last sentence. Maybe not a good one admittedly, but it was only a short sentence.

There are a couple of manual work-arounds people adopt to deal with these situations. Let’s not worry about those, because today I’m going to show you how to automate recurring tasks in Trello. There are two versions of the story I’m going to tell. Firstly, the longer one for those of you who have 5 minutes to learn how to use If This Then That (IFTTT), and secondly a quicker one for those of you who just want to get your recurring tasks set up already and aren’t interested in any of my jibber jabber! Take pity on a fool and scroll down to the bottom if that’s you.

For both you’ll need an account on IFTTT, a free service which works as a kind of magical web glue for sticking your internets together. Clear? Fear not, it will be.

The long(er) version

Get an IFTTT account (free) by clicking the signup link on their homepage, which should take you here.

They will walk you briefly through how IFTTT works. It’s pretty simple. You pick two events, a this and a that. If this happens then we want that to happen. For example:

  • If ‘the weather is sunny’ (this)
  • Tweet ‘weather looks nice, let’s all go to the beach!’ (that)

Or in our instance, if the time is 9am on a Monday create a new card in Trello. Each of those is called a recipe by IFTTT.

So now you’re logged in, click on ‘My account’ and then ‘Create a recipe’ to get started. Or, you can go here which should do the same thing. You should see something like this


IFTTT has a bunch of what they call Channels which can trigger your recipes. Click on this and you will see some of them. Now, stop looking at all the channels and idly imagining the possibilities of wiring up every service you’ve ever heard of. We know we need the time channel, so type time in the search box and select ‘Date & Time’.


You now need to choose how frequently you want to create your new Trello card. Daily? Monthly? Annually? I’m sure you can work it out, you got this far!


I’m using the “Every day of the week at” trigger which doesn’t fire every day of the week, but every day of the week which you select. Ie, every Monday or every Tuesday and Friday.


Pick the time of day you want your trigger to fire on, and the days of the week (or whatever is appropriate for the frequency you selected) and click on create trigger.


We’re half way there! Click on that and search for the Trello channel.


When you click on Trello you will need to log in to your Trello account and let IFTTT access your boards. You will then need to choose which action you want to take in Trello when the trigger fires. Luckily there’s only one action…


So let’s choose ‘Create a card’.

From there you get to set which board and list to create your card in. Choose a title and description as well as assign members, add labels and link attachments. All pretty handy.

Finally you’ll be asked to confirm your choices and create your recipe. You should end up back on your My Recipes page and see your new recipe there. Now, just sit back, relax and wait for 9am Monday morning to roll around and your new robot overlord will tell you what to do :).

The quick version

Head over to IFTTT using one of these links, depending on the frequency of your recurring task

If you’ve got an IFTTT account sign in and add the relevant recipe. If not, click the signup link and follow the instructions.

Need a dashboard to keep on top of your Trello boards? Check out Corrello – Dashboards for Agile teams using Trello

Burndowns! CFDS! cycle time! label counts! all for Trello – It’s Corrello V2

I’m happy to announce a slew (is that the correct collective noun?) of new features in Corrello.

Trello is a popular tool for managing agile projects and it works great for the teams day to day work. However, it could be a bit better on the reporting side of things. The new features in Corrello V2 further close the gap between Trello and other Scrum/Kanban focussed project management tools. Here’s a look at some of the bigger ones.

For Scrum teams

Burndown charts

Choose which list holds your sprint backlog and you can get a burndown chart showing the ideal burdown vs how you’re currently progressing. Learn more about Corrello burndown charts for Trello or about Corrello for Scrum teams.


For Kanban teams

Cumulative flow diagrams

Does what it says on the tin. A cumulative flow diagram showing how many cards (or points) were in each list historically. Learn more about Corrello cumulative flow diagrams.


Cycle time scatter plots

A cycle time plot showing how long completed cards were in progress for vs they day they were completed. There is also a table showing cycle time percentiles. You can learn more about our Cycle time for Trello or all Kanban for Trello features on the main site.

cycle_time_scatter cycle_times

For everyone

Count story points or cards

Corrello now integrates with story point data from the popular Scrum for Trello plugin.

Stats on your labels

Get counts of bugs, important tasks or any other label important to you.


Backlog delivery date estimates

Need a rough delivery date for a card, or want to know how long the next version will take. You can now get all that by including your backlog in Corrello.


If you’ve not tried Corrello yet give it a go for free over at

Build your own Dashboard on the Trello API

Once upon a time someone created a Trello board and invited their team to it. Over time they added cards, moved old ones and archived those they’d finished. One day they started adding labels to their cards (‘Bug’, ‘High priority’, ‘Blocked’). Their use of Trello grew as the team grew, their project grew and others started using Trello. As the team’s use of Trello expanded, managers wanted to get updates on how the team was doing. Are we closing as many bugs as we opened? What’s our velocity? How about a cumulative flow diagram? There was much scratching of heads and “well I suppose we could…”. Until finally one intrepid developer took a look at the Trello API. You are that developer, and here is where you start building your first dashboard on the Trello API.

Wasn’t that a nice story? 🙂 It’s not too far from what I’ve seen at a lot of the companies I’ve been talking to while building Corrello – Dashboards for agile teams using Trello. Today we’re going to build a very simple dashboard which will show a count of cards with each label. The code is all available on Github but I’d encourage you to follow along as we build your dashboard here. It really is extremely simple, but it also shows the key concepts you need to learn about the Trello API to build anything you want on top of it.

First off – The Trello API

Trello have created a fantastic API. In fact, their own mobile apps are built against their API. They did this to show that they aren’t holding anything back from their public API. You get full access to everything their own apps do. You can make 100 requests every 10 seconds which is pretty good. We’ll be able to load the information we need for our dashboard without making people wait. If you were caching data locally obviously things would be even faster.

Trello have also published some very good Trello developer documentation which is worth bookmarking for future reference.

Our blank dashboard

If we’re going to have an empty dashboard, it may as well be a good looking one! So let’s get bootstrap. I’m using v3 but go with whatever you’re happy with. You will need to host this html file somehow. Use whatever you’re happiest with, we won’t be writing any back end code so it really doesn’t matter 🙂

Connecting to the API

Next we need to connect to the API and authenticate a user. The first thing to do is get your app key from here. We will need the key field in the next step where we add the client.js file from Trello to our dashboard, and authenticate our user.

If you look at where we are loading the client.js file from and you will see we pass in a parameter key=[AppKey]. Take [AppKey] and replace it with they key you got for your app.

If you reload your page you should be presented with this popup (if it doesn’t appear check that your browser isn’t blocking popups).

Authorize Trello API

This shows we’re asking for read permission only and that we want access forever. You can choose to get write permission as well when you call Trello.authorize(). Don’t worry, due the the magic of local storage you will only need to authenticate once 🙂

Selecting the board to report on

Now we’re authenticated we can access the Trello API as the user and start loading the data we want. We’ll start by loading all of their boards and asking the user to choose one for us to create a dashboard for. This is where things get a little more interesting.
There is now a select element which we will put our boards in and a loadBoards() function which gets the boards for the current user from the Trello API.

All the loadBoards() function does is call Trello.get() with the path we want to load and tell it to call loadedBoards() when it’s done. All resources in the Trello API are structured in the same way, so if you want to load a specific board you ask for ‘/boards/[id]’ where [id] is the id of the board you wish to load. To get the lists for a board you request ‘/boards/[id]/lists’. What we’re requesting here is all the boards the currently authenticated user can see ‘/members/me/boards’. Simple right?

Getting the counts for the labels

Not long to go now, but we’ve already connected to someone’s Trello account and loaded some data for them. Now we want to let them select a board to report on and get the labels for that board along with the counts of cards with each label. You’ve probably already guessed that we need to call ‘/boards/[id]/labels’ to get the labels we are interested in.

The JSON we get back from that request actually gives us all the information we need! Including the label name, how often it’s used and the colour to use.

Get the full final version of the code here.

What next?

That’s it. Your dashboard may not be anything too fancy (yet) but you now know how to get whatever data you want from the Trello API. If you want to check out the full documentation for the API head here, and if you want to see what is returned from any request checkout the sandbox. You could take your dashboard above and extend it to add the features you want, or move some of the code server side and start storing data in a database. It would be pretty simple to load the cards for a board and display the actual cards linked to each label if you wanted to.

Want a more advanced Dashboard?

If you’re looking for something more comprehensive without all the coding (where’s the fun in that?) do check out Corrello. It’s got cumulative flow diagrams, burndown charts, counts of bugs etc. and lots more.

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