# CRL8 – Correlate daily habits — Which habits make you happy? > Track daily habits to find correlations and understand their impact on happiness and productivity. (iPhone/iPad app by Jonathan Mercer.) - Source: https://appshunter.io/ios/app/crl8-correlate-daily-habits/id1584727849 (this page in markdown: same URL + `.md`) - Developer: [Jonathan Mercer](https://appshunter.io/developer/1139082295) - Category: Productivity, Health & Fitness - Price: Free - Rating: 4.88/5 from 8 App Store ratings · 3 written reviews indexed - Age rating: 4+ - Requires: iOS 14.0 · 1 MB - Languages: English - Released: 2021-09-12 - Data updated: 2026-06-05 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/crl8-correlate-daily-habits/id1584727849/reviews.md ## What is CRL8? Find your most productive habits or find which habits are holding you back. Track all your habits and find the correlation between them. * Does eating a late dinner mess with your sleep? * Does going for morning walks increase the time you spend on side-projects? * Do consistent chats with friends make you less anxious? * Does your period affect your gym performance? How it works * Create tags. Each tag either happens or doesn't in a day * At the end of the day, go through each tag that you you that day * After a few days, there should be enough data to gather correlations between tags For best use of the app: * Track as much as you can. Even the mundane can lead to a correlation (like taking turmeric in the morning) * For events that happen multiple times per day, like walks, consider making a "walk #1" and "walk #2" I'm open to any suggestions on more ways to calculate correlations. Leave a review with your formula! ## Key features - Habit tracking - Correlation analysis - Customizable tags - Daily logging - Data-driven insights ## Recent user reviews (3 of 3) All indexed reviews: https://appshunter.io/ios/app/crl8-correlate-daily-habits/id1584727849/reviews.md ### 4/5 — Basic but it works *2023-03-29* I am really enjoying this app. I love how this lets shows me what is correlated and one cannot find causation without knowing correlation first. Unfortunately it looks like the developer isn’t around anymore (dead website) because there are a few things this app desperately needs (like contact info for comments/questions, a FAQ page, and especially instructions! I have no idea what the circles/half circles mean on the correlation page and I had no clue I could click something more than once and it would show the number on the correlation page. At the same time, it’s still usable so I will continue. ### 5/5 — Best app for simple symptom tracking *2022-05-31* I'm using this for simple symptom tracking. Out of all the apps I've tried it's the best. My one complaint is it doesn't do negative correlations. I.e. it can show you what happens on days you eat mushrooms, but it can't show you what *doesn't* happen in days you eat mushrooms. ### 5/5 — Love this app! *2022-05-27* If I could add anything to it, it’d probably be the ability to drag and drop the boxes around, so as to permute their order, and perhaps change their color if you drop it in a different row. :D ## Frequently asked questions about CRL8 ### What is CRL8 used for? CRL8 helps you track your daily habits and discover correlations between them. This allows you to understand which habits contribute to your happiness and productivity, and which might be holding you back. ### How does CRL8 calculate correlations? You create tags for your daily activities. By logging these tags consistently over a few days, the app gathers data to identify relationships and correlations between different habits. ### Can I track multiple instances of the same habit in CRL8? Yes, for habits that occur multiple times a day, like walks, you can create separate tags such as 'walk #1' and 'walk #2' to track each instance individually. ### What devices does CRL8 support? CRL8 is available on iPhone, iPad, and iPod, making it accessible across various Apple devices. ### Is CRL8 free to use? Yes, CRL8 is available for free, with no in-app purchases or advertisements, allowing for an uninterrupted user experience. ### How often is CRL8 updated? The latest version of CRL8 is 1.6, and it was last updated on October 9, 2021. While specific update frequency isn't detailed, this indicates ongoing development. ### What is the age rating for CRL8? CRL8 has an age rating of 4+, making it suitable for a wide range of users. ### What do users like about CRL8? Users appreciate CRL8's ability to uncover insightful correlations between daily activities and well-being, with an impressive average rating of 4.9 stars from 8 ratings. ## Version history (last 4 releases) ### 1.6 — 2021-10-09 Added "visualization" view. It's like that GitHub green square commit view, but for your tags. It allows you to visualize that's happening throughout the month. ### 1.4 — 2021-10-02 * iOS 15 fixes on UI animation * More padding in logo ### 1.2 — 2021-09-21 Thanks for the feedback! Changes: * added a more complex but less noisy correlation * more tutorial text * correlation screen shows occurrence count * selected tags shows up first in the grid * icon correctly centered * small fixes ### 1.0 — 2021-09-13 No release notes. ## Apps similar to CRL8 | App | Rating | Price | Category | | --- | --- | --- | --- | | [LearnFlow](https://appshunter.io/ios/app/learnflow/id6446949338) | — | Free | Productivity | | [Fire Tracker. Build habits.](https://appshunter.io/ios/app/fire-tracker-build-habits/id6474456340) | — | Free | Productivity | | [WFN: Widgets for Notion](https://appshunter.io/ios/app/wfn-widgets-for-notion/id6740022883) | — | $0.99 | Productivity | | [HabitLeader](https://appshunter.io/ios/app/habitleader/id1634748214) | 5.0 (3) | Free | Productivity | | [Boyoty](https://appshunter.io/ios/app/boyoty/id1604115725) | — | Free | Productivity | | [Build Ur: Build your Life](https://appshunter.io/ios/app/build-ur-build-your-life/id6450644562) | — | Free | Productivity | ## More apps by Jonathan Mercer - [Higher - Map Explorer](https://appshunter.io/ios/app/higher-map-explorer/id1484559419) - [Plato Podcast Player](https://appshunter.io/ios/app/plato-podcast-player/id1671043710) - [Sharper - Decision Diary](https://appshunter.io/ios/app/sharper-decision-diary/id6471383280) - [Nag - Relentless Reminders](https://appshunter.io/ios/app/nag-relentless-reminders/id6472675266) - [Vidnotation](https://appshunter.io/ios/app/vidnotation/id6532588668) All apps by Jonathan Mercer: https://appshunter.io/developer/1139082295 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-05.*