Weed tracker to quit, cut down or understand your cannabis use. Open source.
About this app
Petals is a free and open source cannabis tracker that helps you understand your habit — and change it at your own pace.
Whether you want to quit weed, take a tolerance break, cut down gradually, or simply know how much you actually use, Petals gives you the numbers. No account, no sign-up, and your data never leaves your phone.
TRACK YOUR USE
- Log every session: amount in grams, cost per gram, date and time - Record the consumption method: smoked, vaporized, edible or other - See the time since your last use, down to the second - Track how much you spend on weed, today, this week and overall - Add a use in one tap from the home screen widget
UNDERSTAND YOUR PATTERNS
- Statistics and graphs of your cannabis usage over time - Usage by hour of day and by day of week, so you can see when the urge really hits - Filter your history and spot the trends you would never notice from memory - Watch the real cost of the habit add up
CUT DOWN AT YOUR OWN PACE
- Time-gate your sessions: set a minimum interval between uses and let the timer hold you to it - Register pause periods for a tolerance break or a full stop - No streak shaming, no pressure: the app shows you the data, you set the pace
WITHDRAWAL AND DRUG TESTS
- Track withdrawal symptoms over time: irritability, anger, restlessness, sleep difficulty, anxiety, decreased appetite and discomfort - Estimated THC concentration after your last use - Estimates of when urine, blood, saliva and hair tests may come back clean, with the sources cited
PRIVACY BY DESIGN
- All of your data stays on your device - No account, no cloud, no analytics - Lock the app behind a personal PIN - Export and import everything as plain CSV files — your data belongs to you
HARM REDUCTION
- Built-in harm reduction information, because using less safely beats using blindly
FREE AND OPEN SOURCE
Petals is free and licensed under the AGPL-3.0. The full source code is public, contributions are welcome, and the app is translated by its own community of users.
Licensed under AGPL-3.0-or-later, by Leonardo Colman Lopes.
What's New in v3.41.2
Imported from the F-Droid repository index.
- Fixed a crash that stopped the app from opening at all on recent versions. Sorry about that — updating gets you back in, and your data is untouched.
Version history
Jul 16, 2026 · 10.6 MB · Android API 26–36 · code 3041002
Imported from the F-Droid repository index.
- Fixed a crash that stopped the app from opening at all on recent versions. Sorry about that — updating gets you back in, and your data is untouched.
SHA-256 f9b0dfea2544db32ad1f79a72cb79076b7f301f5fe266109532f7d22f39e8beb
Jul 15, 2026 · 10.5 MB · Android API 26–36 · code 3041001
Imported from the F-Droid repository index.
- Improved the store listing so people looking for a cannabis tracker can actually find the app, and fixed listing translations in Ukrainian and Tamil that described the wrong kind of weed.
SHA-256 d317ad5cf32c736b387424934595f5c9e43c3db56768b6d0f7b0ec719c879d03
Jul 14, 2026 · 10.5 MB · Android API 26–36 · code 3040003
Imported from the F-Droid repository index.
- Refreshed Play Store appearance with new localized artwork
SHA-256 2e4e41a8c60c16b6a903cb773c606801f2da4027fe22ee28def7acaea8ba048c
Will it run on your device?
92%
- Runs on a broad range of modern Android versions.
- Multiple CPU architectures are covered.
- Aligned with the latest Android target SDK expectations.
Installation Guide
Open Settings on your Android device
Go to Security → Unknown sources (or Install unknown apps)
Enable "Allow from this source" for your browser or file manager
Open the downloaded APK file from your Downloads folder
Tap "Install" and wait for installation to complete
Launch the app from your home screen
Make sure to re-enable Unknown Sources restrictions after installation for security.
How to install this safely
How to verify the file you downloaded
Before you install anything, confirm the file is the one described here. On a computer, run shasum -a 256 your-download.apk (macOS or Linux) or certutil -hashfile your-download.apk SHA256 (Windows), then compare the output character-for-character with the SHA-256 on this page. If a single character differs, the file is not the build we recorded — delete it.
What the signing certificate proves
Every Android app is signed with a private key that only its developer holds. The fingerprint on this page is a hash of the matching public certificate, and it proves continuity rather than identity: it tells you a build came from whoever signed the earlier ones. Android enforces this at install time — if a package claiming to be br.com.colman.petals is signed with a different key, the system will refuse to install it over your existing copy. A fingerprint that changes between releases is worth pausing on, because a repackaged app that has been modified by someone else cannot keep the original signature.
How to roll back to an earlier version
If the current release misbehaves, 3.41.1 is the last build before it. Android will not install an older version code over a newer one, so you must uninstall Petals: Cannabis Use Tracker first — which clears its local data unless you have a backup. Reinstall the older APK only if its signing fingerprint matches the build you already trust, and check the API range: an older release may target an Android version your device has moved past.
Why we list sources instead of hosting everything
The official store channel is almost always the right choice: it updates automatically and carries the publisher's own distribution guarantees. A direct APK is useful when a device has no store access, when a rollout has not reached your region, or when you need a specific version — and only when the publisher has authorized that copy. APKBrowse does not list pirated, cracked, or unauthorized rebuilds of Petals: Cannabis Use Tracker, and a listing is removed when the evidence for it stops holding up.
Get Petals: Cannabis Use Tracker
Every source we list for br.com.colman.petals is legality-reviewed. Pirated or cracked builds are never offered.
Other sources
F-Droid listing
officialF-Droid builds this app from source and signs it. This is its official listing, with older builds and full release notes.
Source code
verified publisherThe upstream repository this build is compiled from.
We check legality and signature continuity, but device behaviour still varies. Install at your own discretion.
App Information
Security Verification
We record provenance; we do not run malware scans. Verify the hash yourself before installing.
SHA-256 Hash
f9b0dfea2544db32ad1f79a72cb79076b7f301f5fe266109532f7d22f39e8beb
Signing certificate
4ff7db0e73a378db1570ec9bc802f37902188c27b8171e0cb6d0bbd7fa96371f
Permissions Required
Previous Versions
The signing certificate fingerprint for this release is on record, so a build that does not match it did not come from this publisher.
Report a problem with this listing
A listing is only as good as its corrections. If a source is broken, a signature looks wrong, or this app should not be here, tell the moderation team.