A minimalist Fischer chess clock for Android.
About this app
A chess clock made for blitz
• Defaults to 5+3 Fischer timing: 5 minutes + 3 seconds per move • FIDE-compliant: initial time for 5+3 is 5:03, not 5:00 • Privacy-friendly: no ads, no permissions Fast and intuitive controls
• Touching the screen switches to the next player • Horizontal and vertical dragging set the time and increment • Haptic feedback is enabled by setting the ringtone to vibrate • Back gestures pause and reset the clock Robust time implementation
• Uses the most precise time source available on the device • Clock implementation tested with 100% code coverage Free and secure
• Free software with reproducible builds • Meets Android 15 security requirements • Enables memory tagging on compatible devices
Licensed under Apache-2.0.
What's New in v2.0.8
Imported from the F-Droid repository index.
- • Fix back gestures switching players even with no time left
- • Update dependencies
Version history
Mar 11, 2026 · 0.7 MB · Android API 23–36 · code 208
Imported from the F-Droid repository index.
- • Fix back gestures switching players even with no time left
- • Update dependencies
SHA-256 469e9066dc54c739e2e5313e81e00cf7c5ffc24f4a0b767fcf6db774259ebcc4
Mar 9, 2026 · 0.7 MB · Android API 23–36 · code 207
Imported from the F-Droid repository index.
- • Switch players on finger press instead of release
- • Update dependencies
SHA-256 9a9658258c1ccd6af1b9ecd17c5a83d13259852063c77f6839d77eae3da17ded
Nov 25, 2025 · 0.7 MB · Android API 23–36 · code 206
Imported from the F-Droid repository index.
- • Set minimum SDK version to 23 (Android 6.0)
- • Update dependencies
SHA-256 2247ba87fd76ea1c7a0645243e418d7ba07b9a04774ebaeac3e5dc36b054f709
Will it run on your device?
78%
- Runs on a broad range of modern Android versions.
- ABI coverage is focused on newer 64-bit devices.
- 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 net.leodesouza.blitz 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, 2.0.7 is the last build before it. Android will not install an older version code over a newer one, so you must uninstall Blitz: Fischer Chess Clock 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 Blitz: Fischer Chess Clock, and a listing is removed when the evidence for it stops holding up.
Get Blitz: Fischer Chess Clock
Every source we list for net.leodesouza.blitz 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
469e9066dc54c739e2e5313e81e00cf7c5ffc24f4a0b767fcf6db774259ebcc4
Signing certificate
6d7fd2715ed21cff64086dc5fcf8820a685a793ebd07d972163d86172babba75
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.