TenSync vs Stopwatch Challenge

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.

Stopwatch Challenge is a simple game of timing and nerve. Start the clock, trust your instincts when the display fades, and hit the buzzer as close to the target as you can. Choose a target from 3 to 15 seconds and play again instantly. Every attempt shows your exact time and percentage score, making a perfect stop satisfying and easy to understand. FEATURES • Precision timing measured to one hundredth of a second • A fading display that tests your internal clock • Targets from 3 to 15 seconds • Immediate scores and unlimited retries • Sound and haptic feedback • No accounts, advertisements, or data collection • Works completely offline How close can you get to 100%