Tenstop vs TenSync

10 Second Challenge is a simple yet deep timing game. Press start and try to stop exactly at 10 seconds! The thrill of precision will keep you hooked. After each attempt, you'll see how many seconds off you were and your accuracy percentage, with your best record saved. For an added challenge, try the hidden timer mode. This game will test your sense of time and concentration—give it a try!

TenSync is a minimal timing game: tap Start, then tap Stop at exactly 10.00 seconds. The twist: when other iPhones running TenSync are on the same Wi-Fi, they auto-discover each other and start every round at the exact same moment (synchronized within ±2 ms). Each device stops independently and sees its own result, so you can race friends in the same room with no setup, no accounts, no servers. A 1-second tick metronome (toggleable) helps you stay in rhythm. An 11-second time limit prevents endless waits. Your best attempt is tracked locally. No accounts. No ads. No tracking.