Ratewell: Watch Timegrapher

Mechanical Accuracy & Rate Log

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

Your iPhone is now a precision timegrapher. Measure rate, amplitude and beat error, then track every watch's accuracy over time. Free to measure, forever. Ratewell turns your iPhone into a precision timegrapher for mechanical watches. Hold your watch to the microphone and read rate, amplitude and beat error in seconds — the same measurements a watchmaker's machine gives you, without the costly hardware. But a single reading is only the start. Ratewell logs every measurement to build the one thing other apps don't: a long-term accuracy history for each watch in your collection. MEASURE LIKE A WATCHMAKER - Live timegrapher: rate (seconds/day), amplitude and beat error from your microphone - Calibrated signal detection that stays steady through ambient noise - Six-position analysis: dial up/down, crown left/right and more — see positional variance and isochronism - Chronometer (COSC) tolerance reference so you instantly know if a reading is in spec TRACK ACCURACY OVER TIME - Automatic rate-history chart per watch — every measurement, plotted - Spot drift and regulation issues before they cost you a service - Compare positions, sessions and trends across your whole collection A REAL COLLECTION & SERVICE BOOK - Unlimited watches: brand, model, caliber, reference, purchase date, photos - Service log and reminders: last service, interval, warranty, power reserve - Wear tracking and rotation — know what you wear and what sits idle - Export a clean PDF accuracy certificate or CSV for your watchmaker YOURS, EVERYWHERE - iCloud sync and backup across iPhone and iPad - Home-screen widgets for today's rate and the next service due - Designed dark-first, like a real timing machine, with tabular figures throughout FREE TO MEASURE — ALWAYS The timegrapher and the data you save are never locked behind a paywall. Measure, log and read your full history for free, forever. RATEWELL PRO Unlock the complete instrument: unlimited watches, six-position analysis, isochronism and long-term trends, service reminders, wear tracking, iCloud sync, widgets and export. - Monthly or Annual subscription — the Annual plan includes a 7-day free trial - Or pay once with Lifetime — no subscription, ever Built for collectors who care about precision, from a vintage automatic to a modern chronometer. — Ratewell Pro is an auto-renewable subscription. Payment is charged to your Apple ID at confirmation of purchase. The subscription renews automatically unless it is cancelled at least 24 hours before the end of the current period; your account is charged for renewal within 24 hours before the period ends. Manage or cancel your subscription anytime in your App Store account settings. A Lifetime one-time purchase is also available. Any unused portion of a free trial is forfeited when you buy a subscription. Privacy Policy: https://develak.com/privacy-policy/ Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Ratings & Reviews

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The developer, Develak, 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 based, for example, 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

      • VoiceOver

      • Voice Control

      • Larger Text

      • Dark Interface

      • Differentiate Without Colour Alone

      • Sufficient Contrast

      • Reduced Motion

    Information

    Provider
    • PRIOMAT LLC
    Size
    • 5.2 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 43 more
    • English, Arabic, Bengali, Catalan, Croatian, Czech, Danish, Dutch, Finnish, French, German, Greek, Gujarati, Hebrew, Hindi, Hungarian, Indonesian, Italian, Japanese, Kannada, Korean, Malay, Malayalam, Marathi, Norwegian Bokmål, Oriya, Polish, Portuguese, Punjabi, Romanian, Russian, Simplified Chinese, Slovak, Slovenian, Spanish, Swedish, Tamil, Telugu, Thai, Traditional Chinese, Turkish, Ukrainian, Urdu, Vietnamese
    Age Rating
    4+
    In-App Purchases
    Yes
    • Ratewell Pro Lifetime USD 49.99
    • Ratewell Pro Monthly USD 1.99
    • Ratewell Pro Annual USD 22.99
    • Learn More
    Copyright
    • © 2026 Develak
  • Privacy Policy

    • More by Develak

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