Free, open-source C25K/C210K running trainer. No Google, no tracking.
About this app
C2K is a free, open-source running trainer for Android that guides you from the couch to running 5K or 10K — with no Google services, no tracking, and no ads.
Features: • Couch to 5K (C25K) — 9-week program, 3 runs per week • Couch to 10K (C210K) — 14-week program • Audible voice prompts — "Start running", "Walk for 90 seconds", countdown warnings • Background workout timer — continues with screen off • GPS tracking (optional) — records distance and pace; works without GPS too • Progress tracking — remembers which weeks and days you've completed • Works offline — no internet permission required • No Google Play Services required — compatible with GrapheneOS and de-Googled devices
Permissions: • FOREGROUND_SERVICE — keeps the workout timer running with screen off • WAKE_LOCK — prevents the CPU sleeping mid-workout • ACCESS_FINE_LOCATION — optional GPS for distance/pace tracking (you can skip this) • POST_NOTIFICATIONS — workout notification with pause/stop controls
C2K is free software released under the GNU General Public License v3.
Licensed under GPL-3.0-only, by Matt Brown.
What's New in v1.2.4
Imported from the F-Droid repository index.
- • Fix: build tooling change to produce reproducible builds (no app functionality changes)
Version history
Jul 16, 2026 · 1.8 MB · Android API 26–36 · code 11
Imported from the F-Droid repository index.
- • Fix: build tooling change to produce reproducible builds (no app functionality changes)
SHA-256 4c83c0cfb4f777c5065ab0f15f627ef82094d0cf53fcfabe4fa7f3b0d5208111
Jul 15, 2026 · 1.8 MB · Android API 26–36 · code 10
Imported from the F-Droid repository index.
- • Fix: voice announcements now use the app's language instead of the device's system language
- • Added German, French, and Brazilian Portuguese translations
SHA-256 eb8b9006e1d13f1107b74f1de3cf9ab69ab72639a00aa1106c66e9726b979a31
Jun 30, 2026 · 1.8 MB · Android API 26–36 · code 6
Imported from the F-Droid repository index.
- • New: Monochrome icon for themed icons support on Android 13+
- • Fix: Splash screen now respects dark mode
SHA-256 4a9999fc7dd3ce23f3a574f750e28fdd2155b51828d92a0c95fc6db5e9fb0e40
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.hackerapps.c2k 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, 1.2.3 is the last build before it. Android will not install an older version code over a newer one, so you must uninstall C2K — Couch to 5K & 10K 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 C2K — Couch to 5K & 10K, and a listing is removed when the evidence for it stops holding up.
Get C2K — Couch to 5K & 10K
Every source we list for com.hackerapps.c2k 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
4c83c0cfb4f777c5065ab0f15f627ef82094d0cf53fcfabe4fa7f3b0d5208111
Signing certificate
a4d8f51c09620c0bcbe2c3ed97958d1785c6c2ac7ab9fbf504650f6945407896
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.