Quirk is an open source thought diary for Cognitive Behavioral Therapy (CBT). It costs $5.99 a month.

Cognitive Behavioral Therapy (CBT) is the "gold standard" of psychotherapy and is widely considered to be one of the most effective, evidence backed treatments for depression, anxiety, and panic. If you go into just about any therapist or psychiatrist, CBT will likely be one of the first treatments they try.

Quirk is a companion and self-help app for one of the most common formats of CBT. You may have heard it called "the three column technique" or "catch it, check it, change it." Your brain is really good at making you feel exactly what you're thinking. Often, we find ourselves thinking "automatic negative thoughts" that lead us to fume on something that may not be true. That can cause us to feel depressed or anxious.

CBT helps you record "automatic thoughts," challenge them with cognitive distortions and then train your brain with an alternative thought. If you do it enough, you can change your thoughts, your moods and your behavior.

Quirk is open source under the GPL. You can find the code on Github at:

Terms of Service at:
Privacy Policy at:

What’s New

Version 2.4.0

Fixes crashes on iOS 13

Ratings and Reviews

4.6 out of 5
273 Ratings

273 Ratings

lilkimfan ,

Try this

This is a perfect supplement to therapy. It’s helped me slow down, examine my thoughts and reframe them. It’s like when you complain to a friend and they try to reason with you in an attempt to make you feel better and now you have this new perspective to think about. With Quirk you’re able to easily record the interaction and you’re forced to come up with a new perspective all on your own.

Wahahahe ,

Almost there

I like that this app is simple. Like other “CBT” apps, this app seems to be based on Albert Ellis’ REBT. However, it is missing a couple steps of REBT. For one, under Automatic Thought, it asks, “what is going on?” These are two different questions/steps in REBT. The last two queries—Challenge and Alternative Thought—are essentially the same step; i.e. “Disputation”. REBT asks the following questions; “what is going on” (Activating event), then “automatic thoughts” (Beliefs) then what you are “feeling” (Consequences), then “cognitive distortions” and “disputation” (Disputation), then “new feelings” (Effects). These are the ABCDE steps of Albert Ellis’ REBT or CBT.

IdahoPhoenix ,

mobile mental therapy? Yes please!

We can spend our time, you know, shooting irate pigeons at building materials, or we can use our technology to rebuild our minds and straighten out bad thinking.

Do the latter and do it with this app. I can’t wait till everyone discovers Quirk, this excellent app that helps you maintain your therapy gains on the bus, in the grocery line, or on the toilet (you know it’s true).

Lean in with Quirk.

App Privacy

The developer, Evan Conrad, has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer's privacy policy.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


Evan Conrad
40.6 MB

Requires iOS 10.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating
Infrequent/Mild Medical/Treatment Information
In-App Purchases
  1. Quirk Monthly Subscription $5.99


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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