TGTimer

Watch Timing & Rate Analyser

Only for iPhone

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

iPhone

Get bench-timegrapher accuracy for under £10. Now works with the iPhone's built-in mic — just rest the phone on the watch, no accessory needed. Faster, clearer live readings with a live signal trace. TG Timer does the rest. Designed for watchmakers and enthusiasts who service their own movements, TG Timer measures the rate, beat error, and amplitude of any mechanical watch using autocorrelation analysis of the tick signal — the same technique used by dedicated bench timegraphers costing hundreds of pounds. What It Measures • Rate — seconds gained or lost per day • Beat error — escapement symmetry in milliseconds • Amplitude — balance wheel arc in degrees • BPH — movement frequency, auto-detected or manually set How It Works Rest your iPhone upright with its bottom edge on the watch crystal (dial up), tap play, and follow the quick on-screen guide. A reading builds on screen within a few seconds and keeps refining live as it listens — a live signal trace shows the individual readings settling onto the answer. Leave it running as long as you like; it never times out, so you can be certain the reading is rock-steady. Optional Contact Mic No accessory is needed — but for the strongest signal, especially in a noisy workshop, you can clip on a piezo contact microphone via a USB-C audio adapter. TG Timer detects it automatically. (Search "piezo contact microphone" and "USB-C audio adapter" — typically under £30.) Movement Presets Choose from a built-in library covering ETA, Sellita, Miyota, Seiko, Rolex, Omega, and more. Selecting a preset automatically sets the correct BPH and lift angle for accurate amplitude readings. PDF Reports Generate a clean PDF report with watchmaker and customer details, watch brand and movement, position, notes, and the full rate history chart. Share directly from the app. Designed for the Workshop • Screen stays on during a measurement run • Portrait-locked for stable bench use • Dark interface — easy on the eyes under workshop lighting • No account, no subscription, no data collected

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This update makes measuring with your iPhone's built-in microphone far more reliable: • Much more accurate readings from the built-in mic — now on par with a contact mic • Readings appear and settle noticeably faster • New: save your measurements to a History tab, each with a results summary and PDF export • Fixed a crash when switching between the built-in mic and a contact mic • Smoother PDF report exporting Thanks for using TG Timer — happy timing!

Version 1.3

The developer, NICHOLAS EDWARD WHITE, 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

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    Seller
    NICHOLAS EDWARD WHITE
    Size
    2.9 MB
    Category
    Utilities
    Compatibility
    Requires iOS 16.0 or later.
    • iPhone
      Requires iOS 16.0 or later.
    • Mac
      Requires macOS 13.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Languages
    English
    Age Rating
    4+
    In-App Purchases
    Yes
    Copyright
    © 2026 Nicholas Edward White
  • Developer Website
  • Privacy Policy

    • More by NICHOLAS EDWARD WHITE

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