A backgammon clock for two players sharing one phone between them. Reserve time plus a fixed number of free seconds each turn that never carry over. Defaults to 3:00 with a 12 second delay.
It asks for no permissions at all. There is no network access, no analytics, no accounts, no ads, and nothing to configure before you can play. The whole clock is a single HTML file inside the app.
Tap your own half to end your turn and start your opponent's clock.
Matches
Set the match length to any odd number of points up to 29. The time you set is per point, so a 5-point match at 2:00 a point puts 10:00 on each clock. Each half of the screen reads the score from that player's own side of the board, so both players see their own score on the top line.
At one point there is no match to keep score of, and the score lines disappear entirely — you get a plain single-game clock with a move count.
It survives being closed
Settings and the match in progress are kept on the device: the score, both clocks, the move counts, whose turn it is and how much delay was left. Force-quit it mid-match and it all comes back. The one thing it can't restore is time that passed while the app was closed, so it returns paused rather than charging anyone for the gap — a crash shouldn't decide a game.
Pause freezes mid-turn and resumes exactly where it stopped, delay included. Reset takes two taps, so one stray thumb can't wipe a live match.
Five colour schemes, three sounds generated on the fly, and the screen stays awake while you play.
Design is by Hans de Zwart, partially inspired by the Chess.com clock. Code is by Claude Opus.