Tempochron: Watch Timegrapher

Measure rate and beat error with your iPhone—or compare two dial photos with the camera. Keep care history and readings with each watch.

Tempochron turns your iPhone into a practical timing companion for mechanical watches.

Use the iPhone microphone or a compatible external input to listen to watch ticks, estimate rate, beat error, and timing stability. Or compare elapsed time between two dial photos: align each photo with an atomic-time reference to estimate daily rate without touching the watch.

Save readings by watch for service notes, regulation checks, and before/after comparisons.

Features:

• Live rate and beat error measurement
• Camera time checks with daily-rate history
• Compatible external wired or USB microphones when iOS exposes them as audio inputs
• Automatic BPH detection for common mechanical movements
• Watch profiles with purchase, warranty, and service history
• Private iCloud sync for watch profiles, care records, and measurement history; audio recordings stay on this device
• Multi-position timing sessions for dial-up, dial-down, crown-up, crown-down, crown-left, and crown-right checks
• Signal scope and advanced diagnostics for evaluating recording quality
• CSV, JSON, PDF, and raw audio export tools with Tempochron Pro

Tempochron is designed as a field screening tool, not a certified timing machine. Results depend on microphone contact, background noise, watch position, mainspring state, and movement condition. Use proper bench equipment for final regulation decisions.