Tempochron: Watch Timegrapher

Find out whether your mechanical watch runs fast or slow, using only your iPhone.

Hold the watch against the microphone and Tempochron listens to the escapement, detects the beat rate and shows the daily rate in seconds per day, with beat error and a trust score that tells you when a reading is ready. No microphone contact? Photograph the dial twice against an atomic-time reference and Tempochron works out the daily rate without touching the watch.

FEATURES
• Live rate and beat error with automatic BPH detection
• Live trace and a trust score for every reading
• Faint-tick detection for quiet watches on the built-in iPhone mic
• Camera time checks with a daily-rate history
• Multi-position sessions with a positional summary
• Manual entry for timing-machine results, all positions at once
• Watch profiles with caliber, purchase, warranty and service history
• Private iCloud sync; audio recordings stay on your device
• Wired and USB microphones that iOS exposes as audio inputs
• Made for iPhone and iPad

TEMPOCHRON PRO
The free version covers up to three watches. One purchase, no subscription, adds unlimited watches, multi-position sessions, full history and trends, PDF and CSV reports, JSON backup, raw audio sharing and advanced diagnostics.

Tempochron is a screening tool, not a certified timing machine. Results depend on microphone contact, background noise, position, mainspring state and the movement itself. Use bench equipment for final regulation.