Isochron: Watch Timegrapher

Rate, Beat Error & Amplitude

Only for iPhone

$2.99 · Designed for iPhone. Not verified for macOS.

iPhone

Just launched: time your mechanical watches on iPhone. Rate (s/day), beat error, and stability from the microphone. On-device, never recorded. No extra hardware needed. See how accurate your mechanical watch really is. Isochron uses the iPhone microphone to measure rate, beat error, and stability. Nothing is recorded or sent off-device. WHAT YOU GET • Rate in seconds per day — the number you actually compare between wears • Beat rate from vintage 18,000 BPH to hi-beat 36,000 BPH • Beat error in milliseconds (tick vs tock) • Stability as the reading settles • Amplitude as an estimate, labeled honestly — not a bench-machine claim SIX POSITIONS, ONE MOVEMENT Dial up, dial down, crown up, crown down, crown left, crown right. Spot positional drift before you book a service. A PROFILE FOR EVERY PIECE Save brand, model, reference, movement, and serial. Each measurement stays with that watch so you can see if it is wandering over days and weeks. HOW TO MEASURE 1. Find a quiet room. 2. Hold the watch 5–15 cm from the iPhone microphone, or rest the crown near it. 3. Start a measurement and wait until the rate settles. Longer sessions raise confidence. PRIVACY The microphone detects mechanical impulses only. Sound is not saved and never sent anywhere. No account. No cloud. No ads. No subscription. HONEST LIMITS Isochron is a precision aid, not a laboratory timegrapher. Rate is measured. Amplitude is estimated. Background noise will move the numbers — that is physics, not a defect. Download Isochron and time the watches you actually wear.

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

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    Information

    Seller
    Kaan Uluer
    Size
    951.3 KB
    Category
    Utilities
    Compatibility
    Requires iOS 18.0 or later.
    • iPhone
      Requires iOS 18.0 or later.
    • Mac
      Requires macOS 15.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 2.0 or later.
    Languages
    English
    Age Rating
    4+
    Copyright
    © 2026 Uluer Technoilogy Solutions
  • Developer Website
  • Privacy Policy

    • Supports

    • Family Sharing

      Up to six family members can use this app with Family Sharing enabled.

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