Blitz: Fischer Chess Clock — Open Source Games 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