Tempochron: Watch Timegrapher

Measure Watch Accuracy

Free · In‑App Purchases · Designed for iPad. Not verified for macOS.

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.

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Take a time reading without touching the watch. • Measure daily rate from two dial photos, with an atomic-time reference and clear camera reading history • Keep purchase, warranty, next-service, and service history beside each watch • Sync watch profiles and measurement history privately across devices with iCloud • Use Tempochron more comfortably on iPad with a sidebar and improved Measure layout • Add manual readings with a clear source label, plus reliability fixes for saving camera readings and watch care

The developer, Jan Sokol, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    The developer indicated that this app supports the following accessibility features. Learn More

    • Supported Features

      • Dark Interface

      • Sufficient Contrast

    Seller
    • Jan Sokol
    Size
    • 6.3 MB
    Category
    • Utilities
    Compatibility
    Requires iOS 17.0 or later.
    • iPhone
      Requires iOS 17.0 or later.
    • iPad
      Requires iPadOS 17.0 or later.
    • Mac
      Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Languages
    English and 14 more
    • English, Czech, Dutch, French, German, Italian, Japanese, Korean, Polish, Portuguese, Russian, Simplified Chinese, Spanish, Traditional Chinese, Turkish
    Age Rating
    4+
    In-App Purchases
    Yes
    Copyright
    • © 2026 Cognerva