Petals aims to help users quit or reduce cannabis use and track consumption through its open-source app.
Open source
24 alternativesCaffeineHealth
The CaffeineHealth Android app tracks caffeine and shows estimated active caffeine levels over time.
About CaffeineHealth
CaffeineHealth is an open source Android app that tracks caffeine intake and estimates how much caffeine is still active in the body over the course of a day. Users log drinks from a built-in catalog and view their estimated active caffeine level on a 24-hour chart. The app also forecasts the caffeine level at the user's bedtime and compares it with a sleep threshold the user sets.
The app's personal profile setup asks for details such as age range, weight, bedtime, sleep sensitivity, lifestyle factors and medications, and uses them to adjust the estimated caffeine half-life. The project describes itself as privacy-first. Because the levels are estimates from a model, they should not be treated as exact measurements of caffeine in the body.
Key features
- Live 24-hour caffeine curve showing estimated active caffeine level, updated in real time
- Sleep forecast showing caffeine still active at bedtime compared with a set threshold
- Drink catalog with search and category filter chips
- One-tap logging with custom serving sizes and timing adjustments
- Personalized caffeine half-life based on profile, lifestyle factors and medications
- Opt-in broadcast automation for Tasker, MacroDroid or NFC tags
Best for: Android users who want to track caffeine intake and see how it may affect their sleep timing.
Good for
- Open source, with the source code and license available in the GitHub repository
- Built around a privacy-first design, as described by the project
- Lifestyle adjustments link to their pharmacological sources
Watch out for
- Available only for Android
- Caffeine levels and sleep forecasts are estimates produced by the app's model
- Automation logging of drinks not in the catalog requires entering the caffeine amount manually
CaffeineHealth at a glance
- Category
- Health & Fitness › Health & Fitness Resources
- Type
- Open-source project
- Pricing
- Not confirmed. Check the site
- Platforms
- Android
- Open source
- Yes · Source code
- Language
- English
- Last checked
- Oct 6, 2026 · Online when checked
- Listed
- Oct 5, 2026
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CaffeineHealth FAQ
Can drinks be logged automatically?
Yes. Automation is opt-in and is enabled under Settings → Automation. Tasker, MacroDroid or an NFC tag can send a broadcast to log a drink.
Can the sleep threshold be changed?
Yes. Settings lets the user define the milligram level they consider safe before bed.
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