ChronoBeat: Watch Timegrapher
BPH & Beat Error Analyzer
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
Turn your iPhone into an acoustic mechanical watch analyzer. Measure beat rate and beat error on-device using your microphone or supported AirPods input.
Turn your iPhone into an acoustic mechanical watch analyzer.
ChronoBeat listens to the tick of your mechanical watch and analyzes it directly on your iPhone. Place the watch near the microphone — or use supported AirPods microphone input — and ChronoBeat estimates the beat rate (BPH), beat error and, when the signal allows it, the daily rate.
YOUR iPHONE LISTENS. CHRONOBEAT ANALYZES.
• Beat rate (BPH) detected from the sound itself — 18,000, 21,600, 25,200, 28,800, 36,000 BPH and other standard rates, never assumed
• Beat error from the timing difference between tick and tock, shown only when the two can be reliably separated
• Rate in seconds per day, with its uncertainty, when the measurement is stable enough
• Timegrapher-style trace of every beat
• Signal quality, stability and a confidence score for every result
• Live analysis while you measure: BPH, beat error, signal, confidence and detected beats
HONEST BY DESIGN
If the signal cannot support a value, ChronoBeat shows “--” and explains why instead of inventing a number. Results below the confidence threshold are never saved and never count as a test.
ON-DEVICE ACOUSTIC DSP
Band-pass filtering, envelope extraction, transient detection, autocorrelation and a robust timing fit run entirely on your iPhone. No cloud processing, no audio upload, no account. Measurements work in Airplane Mode.
BUILT FOR WATCH ENTHUSIASTS
• Watch profiles for your collection
• Position tags (dial up, dial down, crown up/down/left/right)
• History grouped by watch, with notes
• Statistics: averages, rate trend, rate by position and charts
• CSV and JSON export, shareable result cards
• Apple Watch companion with your latest results and complications
PRICING
Try 3 successful measurements for free. Failed or cancelled attempts never count. Unlock unlimited measurements with a one-time ChronoBeat Lifetime purchase — no subscription. Free and paid tests use the same measurement engine.
PLEASE NOTE
ChronoBeat is an acoustic timing analyzer, not a certified timegrapher and not a replacement for professional watchmaking equipment. Results depend on your watch, microphone, placement and room noise. ChronoBeat does not measure amplitude. AirPods microphone availability depends on your AirPods model, iOS version and connection.
Support: chronobeat@tarikdavulcu.com
Ratings & Reviews
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The developer, Tarik Davulcu, 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.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Tarik Davulcu
- Size
- 4.5 MB
- Category
- Utilities
- Compatibility
Requires iOS 26.0 or later.
- iPhone
Requires iOS 26.0 or later. - Mac
Requires macOS 26.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 26.0 or later. - Apple Watch
Requires watchOS 26.0 or later.
- iPhone
- Languages
English and 6 more
- English, Arabic, French, German, Japanese, Spanish, Turkish
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- ChronoBeat Lifetime $24.99
- Copyright
- © 2026 Tarik Davulcu