SemperClock is a multi-device workout timer and performance tracker built for serious training
SemperClock is a multi-device workout timer and performance tracker built for serious training. It connects your iPhone, Apple Watch, and Apple TV into a synchronized fitness system — so your timer, heart rate, and rowing metrics stay in sync across every screen. UNIFIED MULTI-DEVICE EXPERIENCE Start a workout on your iPhone and see it live on Apple TV across the room. Track heart rate from your Apple Watch or a Bluetooth chest strap. Every device stays perfectly in sync over your local network. 11 WORKOUT FORMATS Program any style of high-intensity training: - For Time and Rounds for Time - AMRAP (As Many Rounds As Possible) - EMOM (Every Minute on the Minute) - Tabata intervals - Ladder and Pyramid schemes - Chipper, Complex, and more Each format supports customizable work/rest periods, round counts, time caps, and flexible exercise programming with reps, distance, weight, and calories. CONCEPT2 ROWER INTEGRATION Connect directly to your Concept2 PM5 via Bluetooth for real-time stroke rate, pace, distance, power, and 500m splits. Run programmed rowing workouts with single distance, interval, and open rest modes. Track individual interval results with average pace and power breakdown. MULTI-SOURCE HEART RATE Combine Apple Watch heart rate with external Bluetooth sensors like the Polar H10. SemperClock intelligently prioritizes the best available source and tracks time spent in five heart rate zones throughout your workout. MULTI-USER WORKOUTS Train with others locally or remotely. The Bullpen staging area lets multiple devices connect before a workout begins. Track heart rate and performance for every participant on one screen. Apple TV serves as the shared display for group training. APPLE TV DISPLAY Purpose-built tvOS interface shows the workout timer, participant heart rates, and rowing metrics in a large, readable format. Ideal for home gyms, garage setups, and group classes. DETAILED RESULTS Every workout captures total time, round splits with delta tracking, average and max heart rate, heart rate zone breakdown, rowing splits, and exercise-specific rep counts. VOICE COMMANDS Enter scores and control your workout hands-free with built-in speech recognition. Built entirely with SwiftUI for a native experience on every Apple platform.