Free iPhone timegrapher

Your iPhone.
Your watch.
Precision timing.

Isochron measures mechanical-watch rate (seconds per day), beat error, beat rate, and stability through the iPhone microphone. Amplitude is estimated — and labeled that way. Audio is never recorded.

Download on the App Store Privacy policy

Coming soon — bundle com.uluersolutions.isochron

Isochron measuring +3.8 seconds per day on a Rolex Submariner Date

What you get

The numbers collectors actually use

A timing companion for the watches you wear — not a laboratory claim, and not another subscription.

Measured

Rate in seconds / day

See how fast or slow a movement runs, from a quiet room, 5–15 cm from the microphone.

Measured

Beat rate & beat error

From vintage 18,000 BPH to hi-beat 36,000. Beat error in milliseconds — tick versus tock.

Calculated

Stability as it settles

Watch the reading settle. Longer sessions raise confidence. Background noise will move the numbers.

Estimated

Honest amplitude

Amplitude is estimated from impulse energy and tagged as estimated. Not a bench-machine claim.

Six positions

Dial, crown, drift

Dial up/down, crown up/down/left/right. Compare positional drift before you book a service.

On-device

Collection + history

Profiles for brand, model, reference, movement, serial. Each result stays with that watch on this iPhone.

How it works

Three steps. A quiet room.

Find a quiet room

Isochron listens for mechanical impulses. HVAC, conversation, and desk noise will move the reading — that is physics, not a defect.

Place the watch by the microphone

Hold it 5–15 cm from the iPhone mic, or rest the crown near it. Start a measurement and wait until the rate settles.

Save it to the watch

Keep a history per piece. Compare positions. See whether a daily wearer is wandering over days and weeks.

Product

Dark champagne. Built for horology.

Measure screen showing seconds per day Six timing positions Watch collection profiles Measurement history Privacy settings

Privacy

The microphone never keeps a recording

Timing analysis runs in memory on your iPhone. There is no account, no cloud, no ads, and no analytics SDK.

  • Audio stays here Sound is processed on-device and is not written to disk or sent anywhere.
  • Your collection stays here Watch profiles and results live in SwiftData on this iPhone.
  • No account Isochron does not ask for email, login, or personal information.
  • No tracking No advertising identifier, no third-party analytics.

Read the full privacy policy. Support: support@kaanuluer.com.

Honest limits

A precision aid, not a laboratory timegrapher

Isochron is for daily checks, positional comparison, and collection records. Rate is measured. Amplitude is estimated. It does not replace a Witschi or a watchmaker’s bench machine.

iPhone · iOS 18+

Time the watches you actually wear

Free. No extra hardware. No subscription.

Coming soon on the App Store