Blitz: Fischer Chess Clock

Blitz: Fischer Chess Clock is an open-source Android application in the Games category. It provides a chess clock for blitz games, where each player’s available time is managed alongside an increment added after moves. Its default setting is Fischer 5+3, meaning five minutes of starting time and three seconds added per move. For this setting, the initial display follows FIDE timing by using 5:03 rather than 5:00.

The controls are designed for direct use during a game. Touching the screen switches control to the next player, while horizontal and vertical dragging set the clock time and increment. Back gestures pause and reset the clock. Haptic feedback can be enabled by setting the device ringtone to vibrate.

The clock uses the most precise time source available on the Android device. Its clock implementation has been tested with 100% code coverage. The application has no ads and requests no permissions, making its privacy behavior straightforward. It is free software with reproducible builds, meets Android 15 security requirements, and enables memory tagging on compatible devices.

As an Android game utility, Blitz: Fischer Chess Clock is suited to players who need a dedicated timer for blitz chess. MirrorNest distributes the official build directly from its own storage. Before publishing, MirrorNest scans the mirrored build for malware, providing a direct catalog route to this open-source Android software.