Track what your body is doing while fasting
About this app
Simple, Free, Open Source.
No ads, no in-app purchases, no permissions.
Just tell the app when you start your fast, and check back in to see what your body is doing during your fast.
Licensed under MIT, by Darkrock Studios.
What's New in v5.0.1
Imported from the F-Droid repository index.
- - Localization updates
- - Remove READ_PHONE_STATE permission
- - Properly clear session notifications
Version history
May 28, 2026 · 4.5 MB · Android API 26–36 · code 40
Imported from the F-Droid repository index.
- - Localization updates
- - Remove READ_PHONE_STATE permission
- - Properly clear session notifications
SHA-256 424d8fafc1bc14313021e9e9713723f86a13507787159803b38a63a61668f909
Apr 24, 2026 · 5.1 MB · Android API 26–36 · code 39
Imported from the F-Droid repository index.
- - Dark mode with System/Light/Dark selector
- - Calendar view on Log screen
- - Stage animation
- - Locale-aware weight decimal separator
- - Fixed AM/PM vs 24-hour clock inconsistency
- - Metric toggle moved to Settings
SHA-256 3b0613ffed8a7677c9109713609642e89966b0549625ea59050f1cc40d585811
Dec 24, 2025 · 5.2 MB · Android API 26–36 · code 38
Imported from the F-Droid repository index.
- - Fix high power usage when in background
- (thanks for the report atom-smasher!)
- - Fixed fasting screen on very small screens
- - Translation updates
- - Library updates
SHA-256 92a6f95afa3067bc1957df3087b3e2d675164dc9a0aa77241bb224539b119e19
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 com.darkrockstudios.apps.fasttrack 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, 5.0.0 is the last build before it. Android will not install an older version code over a newer one, so you must uninstall FastTrack 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 FastTrack, and a listing is removed when the evidence for it stops holding up.
Get FastTrack
Every source we list for com.darkrockstudios.apps.fasttrack 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
424d8fafc1bc14313021e9e9713723f86a13507787159803b38a63a61668f909
Signing certificate
66a4da23c900c2a57c117c026059eb1352a04e8a7dc00b393bbddbcc7e1383b6
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.