Tap a player's clock to start the other side's timer. Over-the-board play, no app needed.
This is a standard two-player chess clock. Pick a time control (or set a custom one with an increment), press Start, then tap the running player's clock when you've moved — that stops your clock, adds your increment, and starts your opponent's. When a clock hits zero it flags red.
Prefer to play with the clock built in? Play online free — every game is timed and rated. New to time controls? See how ratings work.