Blitz: Fischer Chess Clock vs Guessaday
Side-by-side comparison of two open source alternatives
Blitz: Fischer Chess Clock
A chess clock made for blitzDefaults to 5+3 Fischer timing: 5 minutes + 3 seconds per moveFIDE-compliant: initial time for 5+3 is 5:03, not 5:00Privacy-friendly: no ads, no permissionsFast and intuitive controlsTouching the screen switches to the next playerHorizontal and vertical dragging set the time and incrementHaptic feedback is enabled by setting the ringtone to vibrateBack gestures pause and reset the clockRobust time implementationUses the most precise time source available on the deviceClock implementation tested with 100% code coverageFree and secureFree software with reproducible buildsMeets Android 15 security requirementsEnables memory tagging on compatible devices
Guessaday
A trainer for calculating the day of the week of any given date. This app displays a random date and asks you what day of the week that date is. Then it checks your answer. Optionally it measures how long it took you. In the settings you can configure the range for the random date. If you want to learn how to do this calculation, check out on the developer's website!
| Feature | Blitz: Fischer Chess Clock | Guessaday |
|---|---|---|
| License | Apache-2.0 | GPL-3.0-only |
| Install sources | F-DroidGitHub | F-DroidGitHub |
| Categories | GamesCalendar | ProductivityGamesCalendar |
| Features | Ad-FreeOpen SourceNo Tracking | Ad-FreeOpen SourceNo Tracking |
| Platforms | Android | Android |
| Website | ||
| Source code |