Blitz: Fischer Chess Clock

Léo de Souza

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 anywhere on the screen switches to the next player
• Time and increment are set by horizontal and vertical dragging
• 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
• Open source with reproducible builds
• Enables memory tagging on compatible devices
• Meets Android 15 security requirements

What's new

• Fix bug where clock would reset if time ended during back gesture