Calibre: Watch Collector

Mechanical Watch Timegrapher

Free · In‑App Purchases

Calibre is a precision instrument for your pocket — a software timegrapher that measures the accuracy of mechanical watches using your device's wired or built-in microphone. Place the microphone so that it can pick up the sound of your watch/movement and Calibre begins listening immediately. The escapement's tick and tock are detected in real time and the app computes the same measurements as a physical paper-tape timegrapher: • Rate deviation — seconds per day gained or lost relative to nominal • Beat error — asymmetry between the tick and tock intervals in milliseconds (preview) • Amplitude — the arc of the balance wheel in degrees (preview) • BPH — the beat frequency of the movement, detected automatically or set manually A scrolling paper-tape trace gives you a live visual of timing consistency. An ensemble beat waveform view overlays averaged tick and tock cycles for detailed acoustic inspection. Confidence bars and real-time signal quality indicators guide you to the best microphone placement. WATCH LIBRARY Build a library of watches/movements with individual profiles — lift angle, nominal BPH, caliber notes and full measurement history. Measurements are grouped by dial position when you measure the same watch in multiple orientations and a rate history chart shows how accuracy changes over time. Service events mark the start of a new era so pre-service data is retained but excluded from current analysis. REAL-WORLD COMPARISON Manual timing runs let you log (real time, watch time) pairs over hours or days. Linear regression computes drift rate, current offset and R², letting you compare bench measurements against the watch's actual performance on the wrist. AUDIO PIPELINE Separate DSP profiles for built-in, wired and Bluetooth microphones switch automatically when the audio route changes. Optional AudioKit Butterworth filters, software AGC, adjustable detector threshold and envelope release give you precise control over how the signal is processed. An on-demand signal analyser inspects the live audio feed and suggests filter and gain settings as individually-appliable cards. FULLY OFFLINE No account required. No network requests. No analytics or telemetry. All measurement data stays on your device. Calibre is designed for watch enthusiasts, collectors and watchmakers who want data at their fingertips. LEGAL Privacy Policy: https://calibrewatch.app/privacy Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

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Welcome to Calibre 1.2. LIBRARY VIEWS The Watches tab gains a photo grid. Tap the toolbar button to switch between grid and list. Grid cells are larger on iPad to show more detail and watches. FILTER AND SEARCH Filter the library by movement type or brand. Search by name, brand, model or caliber. The filter button highlights when a filter is active. PDF WATCH REPORT Export a formatted PDF for any watch from the share menu: specs, rate-history chart, measurement table, service history, magnetism readings and timing runs in one document. BRANDS Brand autocomplete now spans hundreds of makers including a large catalog of micro brands. When a brand is recognised you can tap through to its official homepage in an in-app browser. MOVEMENTS The built-in caliber database has nearly doubled. It adds more mechanical movements, a wide range of quartz movements and Seiko Spring Drive. Choosing a known caliber fills the movement type automatically and skips beat rate and lift angle where they do not apply. ADD WATCH It is now possible to add a watch via a web search. AMPLITUDE MEASUREMENT Improvements to timegrapher amplitude measurements. FIXES • Corrected the magnetism sensor reticle position on iPhone • Magnetism readings are hidden for watches marked as wanted • Consistent typography across the app

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

    Seller
    • Tim McNerney
    Size
    • 9.5 MB
    Category
    • Utilities
    Compatibility
    Requires iOS 17.0 or later.
    • iPhone
      Requires iOS 17.0 or later.
    • iPad
      Requires iPadOS 17.0 or later.
    Languages
    English and 2 more
    • English, French, Spanish
    Age Rating
    4+
    In-App Purchases
    Yes
    • Calibre Pro Annual $4.99
    • Calibre Pro $14.99
    Copyright
    • © 2026 Oneofus