Skip to content


Switch branches/tags

Name already in use

A tag already exists with the provided branch name. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Are you sure you want to create this branch?


Failed to load latest commit information.
Latest commit message
Commit time
August 9, 2019 09:20
July 12, 2019 13:08
October 6, 2019 11:30
August 9, 2019 09:20
June 7, 2019 17:56
October 6, 2019 11:30
March 25, 2019 21:50
April 6, 2019 15:43
October 6, 2019 11:30
July 30, 2019 09:59
July 10, 2019 11:51
December 2, 2018 15:27
September 25, 2019 13:28
December 22, 2018 11:16
January 6, 2021 11:23
June 22, 2019 12:22
September 26, 2019 10:11
June 22, 2019 12:22
September 27, 2019 11:23
September 27, 2019 11:23
April 9, 2019 21:50
December 25, 2018 11:24
September 27, 2019 11:23


Quirk is no longer being maintained.

Quirk started as a little thing I made for myself as I started doing CBT. As I got better, I needed Quirk less. But at the same time, lots of other people had discovered Quirk and started picking it up. That meant more bug fixes, more features, and just more work to be done. I really couldn't keep it up well, especially with my main focus at the time (my day job).

So in order to work on it full time, my brother and I tried to turn it into a company. That way we could continue to develop Quirk as a primary focus, even if we didn't need it anymore.

For awhile, Quirk was going quite well. Lots of people subscribed, we got backed by Y Combinator, and we were growing very quickly.

Unfortunately, in order for the business to work and for us to pay ourselves, we needed folks to be subscribed for a fair amount of time. But in general, most people fell into three camps: didn't use the app at all (and weren't getting value for what they paid), felt better and then unsubscribed, or didn't feel better but persisted anyway. That meant the business model treated successes as failures and failures as successes. So a future Quirk would need to make people feel worse for longer or otherwise not help people we signed up to help. If the incentives of the business weren't aligned with the people, it would have been naive to assume that we could easily fix it as the organization grew and we held less control. We didn't want to go down that path, so we pivoted the company.

Anyone who's followed this project will know that we explored multiple paths towards sustainability. Much of it was discussed in the PRs and issues of this repo. We've investigated a completely free model, an indie open source model, a community open source model, a donation model, a pay-up-front model, an ad model, a tele-therapy model, and a subscription model.

Quirk (the company) is now Room Service.

Now-a-days, we're making Room Service, which helps folks build multiplayer stuff, like what Figma or Google Docs have. Multiple cursors, CRDTs, sockets, lots of people editing the same thing, that sort of thing. We're still the same commercial entity and such, just making a different product now. If you think multiplayer systems are cool and want to join us, send me an email: evan @ roomservice . dev.

Make your own Quirk.

If you like Quirk and want it to continue, feel free to fork it. We'd ask that you change the name to avoid confusion. Just heed our warning, becareful about the way you keep yourself afloat and becareful about your desire to work on this full-time. There's more of a write up about this here.

If you want to fork Quirk, you should fork off of this commit, it's right before we added payments and when the code was the cleanest.


โœจ๐Ÿ™ quirk.

Download iOS โ€ข Download Android โ€ข Contact โ€ข Newsletter

Quirk is a crossplatform, GPL-licensed, Cognitive Behavioral Therapy (CBT) app built in React Native / Expo.

Unlike many CBT apps, it's fairly unbiased in what you use it for; it doesn't ask about you to do depression-specific CBT exercises. That makes it fairly quick and discreet to use, especially in a public setting.


How Quirk Supports Itself

In order for Quirk to support itself, it charges a small subscription fee. Currently it's $5.99 / month in the US, which is roughly the cost of a cup of coffee. This helps pay for a full-time developer to make Quirk not-dead and generally good.

The Survival Law of Product Design

To understand why we do a subscription, we can look to the Survival Law of Product Design, a fancy term I just made up. When you make a product, whatever keeps that product alive becomes the primary force of design.

For example, is not Facebook's product, is Facebook's product. Because 0 dollars are made from facebook accounts, only from advertisers that pay to get access to those facebook accounts. The way you keep the lights on ultimately shapes the product you make.

So if you want to make a good product that helps folks, you should pick a model of sustainability where the financial incentives of the organization are aligned with the individual interests of the users.

After a lot of tries with other models, that ended up being a subscription. In a subscription, the primary metric is retention: are people still using this thing? If retention drops, people cancel their subscription and you no longer get to exist.

The only solid way to have good retention is to create something that is actively useful and good. Similarly, the only way to get any value from CBT is to consistently do it.


Some amazing folks have helped build the Quirk you see today.

  • @devinroche for setting up translation and stepping up as a core maintainer ๐Ÿ”ฅ
  • @devilcius for the amazing Spanish translation ๐Ÿ‡ช๐Ÿ‡ธ
  • @idnovic for the amazing German translation ๐Ÿ‡ฉ๐Ÿ‡ช (and the iPad support!)
  • @kwierbol for the amazing Polish translation ๐Ÿ‡ต๐Ÿ‡ฑ
  • @Walther for the amazing Finnish translation ๐Ÿ‡ซ๐Ÿ‡ฎ
  • @Jos512 for the amazing Dutch translation ๐Ÿ‡ณ๐Ÿ‡ฑ
  • @jinto for the amazing Korean translation ๐Ÿ‡ฐ๐Ÿ‡ท
  • @briankung for the Chinese ๐Ÿ‡จ๐Ÿ‡ณ localization, internationalization support and helping guide the entire translation effort. ๐ŸŽ‰
  • @akinariobi for the Russian translation ๐Ÿ‡ท๐Ÿ‡บ
  • @miguelmf for the Portugese translation ๐Ÿ‡ต๐Ÿ‡น
  • @comradekingu for the Norweigan Bokmรฅl translation ๐Ÿ‡ณ๐Ÿ‡ด
  • @micheleriva for the Italian translation ๐Ÿ‡ฎ๐Ÿ‡น
  • @Jolg42 for the French translation ๐Ÿ‡ซ๐Ÿ‡ท
  • @Buricescu for the Romanian translation ๐Ÿ‡ท๐Ÿ‡ด

Running Locally

Quirk is built on React Native and therefore assumes you have node installed. Yarn is preferred over NPM as a package manager.

# clone the project and cd into it
git clone; cd ./quirk

# copy the sample .env (edit as required)
cp .env.sample .env

# install dependencies

# start development environment
yarn start

You'll then be in the expo development environment. If you already have XCode installed with a simulator, you can just press i to start it.

Can I help?

Of course!

If you like the app, go give it 5 stars! It helps more people find the app.

If you're a mental health professional, audit the descriptions of the cognitive distortions. If you have suggestions, let me know and we'll change stuff!

If you can draw and can make digital illustrations of the little blobs, let me know and I'll find a place to stick them in the app!

If you know a language other than English, help us translate the app!


Quirk's goal is to be both inviting and focused. It should be really easy to enter in a thought; people frequently enter these in public settings and need to do it fairly quickly. It also should not cause any increased frustration.

Design Logic

Quirk is built with two main goals in mind:

  • Don't be bloated
  • Don't be evil

Don't be bloated

Don't include features for one particular condition at the expense of other conditions. For example, don't couple mood tracking to thought tracking. If a user has to enter a mood in order to track a thought, then the entire app is ruined for people who use it for panic, OCD or another condition where mood isn't the primary focus.

Don't include non-CBT related treatments without good reason. No relaxation audio tracks or meditation guides. It's a CBT app, keep it focused on CBT.

Don't include things that could be better accomplished by another app. No one needs an in-app diary when a diary works just fine. No one needs an in-app heart rate tracker when a heart rate tracker works just fine.

Be quick and efficient. Thoughts shouldn't take 5 minutes to enter and you should be able to skip fields if it's reasonable. Don't let the perfect be the enemy of the good.

Don't be Evil

Thoughts are more valuable than passwords, treat them that way. Most people would rather give over their passwords than their CBT thoughts. They're incredibly private, occasionally involve other people, and frequently are embarrassing.

Don't have $200 dollar in app purchases. I'm looking at you CBT Thought Diary. I get it, developers need to make money. It costs a lot to just keep the app on the app store. But you're preying on vulnerable people. Very few people of rational mind will purposely spend $200s for a dark mode.

Don't have dumb notifications. Scheduling is fine, abusing push notifications so your app has better traffic is scummy and gross.

Be open. Not every app has to be open source; it's a hard choice to make. But be clear and obvious within the app about what's going on with the user's data. Don't be sending it to some server without making that clear within the app, especially if it's not providing any extra utility to the user.

Don't push people to be unhappy. Do not purposefully or accidentally force people to be unhappy to use their app. Don't force people to state their unhappy in order to access a feature. It's easy for this to sneak up in the design, if a user has to rate their happiness below average in order to access the CBT features, you're asking them to be unhappy to use your app.

Be extremely cautious about making engagement your core metric. User engagement is fine to be concerned about. We all want people who need help to be actually engaging in the help. But holy moly becareful about this. You do not want to drive something that is for many people a treatment into a self-perpetuating engagement loop. A ruthless focus on engagement has caused many a product to become skinner boxes. No one should ever be addicted to your mental health app.

Engineering Logic

Quirk must not lose user data. The entire point of the app is to record your thoughts, so if you lost them it would be pretty bad. As stated in one study:

While an app failure in general can be inconvenient and annoying, it can have serious consequences in the context of mental health appsโ€”someone who has come to rely on an app for emotional support can find a failure โ€œdevastating.โ€

Therefore, data management should be given a higher priority than any other part of the app.

Taxonomy and Order of Data Failure Cases

The following is a list of extremely bad behaviors and states that could happen in order of severity.

1 - Large Scale Data Corruption

All thoughts have been corrupted somehow. For example, the JSON format of every item is wrong. This is put at the top because not only can a user not access the data, but it may spiral out can cause continuing errors forcing the app to be "bricked."

2 - Large Scale Data Loss

All thoughts have been deleted without any hope of recovery.

3 - Small Scale Data Loss

A small amount of data has been deleted without any hope of recovery.

4 - Small Scale Data Corruption

A small amount of data has been corrupted in a recoverable way. The user still has lost data, but the app does not crash, and this is potentially fixable via an update.


Quirk is licensed under the GPL, which guarantees end users the freedom to study, share, and modify the software.

Note that this license does not give free reign to redistribute the name and branding of quirk. So if you'd like to publish your own version, please rename it to avoid end-user confusion.