No subscription, ever. Measure rate, amplitude and beat error in 30 seconds, track every watch you own, and see what it's worth — with the first watch free forever.
A timegrapher in your pocket: rate, amplitude and beat error from your iPhone's microphone in 30 seconds. Reads through room noise, with amplitude computed from your calibre's own lift angle. First watch free — Pro is one purchase, never a subscription.
WHAT IT MEASURES
• Rate — seconds gained or lost per day, the number a chronometer certificate is built on
• Amplitude — how far the balance swings, the vital sign a watchmaker checks first
• Beat error — the tick/tock asymmetry that says the escapement wants adjusting
• Beat rate — detected automatically, from vintage 18,000 bph to hi-beat 36,000 bph
WHY THE READINGS HOLD STEADY
Phone timing apps have a reputation for jumping around, and for amplitude you can't trust. Two things are done differently here. The analyser tracks the room's own noise floor and rejects transients, so a quiet movement stays locked on — it will read a watch through a barking dog. And amplitude is computed from the lift angle you set for that specific calibre, because a wrong lift angle is the single most common reason a phone app reports the wrong swing.
Each tick is really three tiny impacts. Timegrapher times every one to a fraction of a millisecond and fits thousands of them against your iPhone's clock — the same principle as a watchmaker's bench machine.
YOUR COLLECTION
Add every watch with a photo, reference and serial number, year, movement type and lift angle. Every measurement is saved, and charts show the rate drifting across months and years — so a movement slowly going off gets caught early. After each reading you get a plain-language verdict, Excellent through Service needed, with the reasons spelled out. A Guide tab explains every number in plain English.
TRACK WHAT IT'S WORTH
One tap pulls current Chrono24 asking prices for your exact reference and logs the median — computed on your device, in your own currency. Log what you paid and Timegrapher charts each watch's value over time, its gain since purchase, and your collection's total.
PRIVATE BY DESIGN
Everything runs on the device. No audio is ever recorded, stored or uploaded. No account, no ads, no tracking.
PRICING
Your first watch is free, forever. Timegrapher Pro unlocks unlimited watches for a single payment — no subscription. Purchases restore on any device signed into the same App Store account.
HONEST LIMITS
A quiet room and firm contact between phone and case give the best readings. Results are indicative: a bench machine and a professional's judgement remain the gold standard for service decisions.
Ratings & Reviews
4.9
out of 5
8 Ratings
STEADIER, FASTER MEASUREMENTS
The measuring engine is new. It finds the watch's beat from its regularity and times each tick against that watch's averaged tick. A weak or noisy signal now gives a steady reading.
• The first reading appears within a few seconds.
• The trace stays steady while you measure.
• Amplitude is read from the averaged tick, where the faint first sound of each tick is visible. If the room is too noisy to measure it, the app shows a dash until it can.
• The app listens in the frequency bands where the ticks are clear and leaves out the bands that carry only room noise.
• Measurements finish at 30 seconds more often, because the app now hears more of the ticks.
For the strongest signal, rest the bottom of the iPhone on the watch glass.
RATE OVER A DAY OF WEAR
Photograph the dial, wear the watch as usual, and photograph it again the next day. Timegrapher reads the time of each photo from the photo itself. You mark the seconds hand on both. The app then shows how much the watch gained or lost on your wrist during that day.
A day between photos gives a reading precise to a fraction of a second. Shorter gaps also work, and each result shows its precision. Your first photo stays saved, so you can close the app and come back later.
GERMAN, FRENCH AND JAPANESE
The Guide, the health verdicts, the Pro screen, purchase messages and the microphone and camera prompts are now translated. In version 2.4 they were still in English. Numbers now use your region's decimal separator throughout the app.
FIXED
• On the trend chart, choosing Amplitude could hide the other tabs when a reading had no amplitude. All three tabs now stay visible.
Version 2.5
The developer, Fotios Avgidis, 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
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
Seller
Fotios Avgidis
Size
2.4 MB
Category
Utilities
Compatibility
Requires iOS 17.0 or later.
iPhone Requires iOS 17.0 or later.
Mac Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.