Timegrapher — Watch Accuracy

Timegrapher — Watch Accuracy

Rate, Amplitude & Beat Error

24 ratings
1 review
Free
In-App Purchases

Details

Released
July 20, 2026
Updated
November 1, 2026

Features

Timegrapher — Watch Accuracy screenshot #1 for iPhone
Timegrapher — Watch Accuracy screenshot #2 for iPhone
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Timegrapher — Watch Accuracy screenshot #5 for iPhone
Timegrapher — Watch Accuracy screenshot #6 for iPhone
Timegrapher — Watch Accuracy screenshot #7 for iPhone
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About

This app uses your iPhone's microphone to analyze watch accuracy, measuring rate, amplitude, and beat error. It provides detailed insights into your watch collection's performance and value, all processed locally on your device.

✓Measures rate, amplitude, and beat error
✓Analyzes beat rate from 18,000 to 36,000 bph
✓Tracks watch collection performance over time
✓Computes current market value from Chrono24
✓Provides plain-language verdicts on watch condition
✓Processes all data locally for privacy
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What's New in Timegrapher

2.8

November 1, 2026

Two changes you asked for: • Lift angle to a tenth of a degree. The slider now moves in steps of 0.5°, and the − and + buttons beside it change the lift angle by 0.1°, so you can enter values like 51.5° or 49.3° from a lift angle table. • More photos of each watch. Add up to 12 more photos, such as the caseback, the movement, the box and papers, or the watch on your wrist. Crop each one, or make any of them the main photo. Swipe through them at the top of the watch's page, and tap one to see it full screen and zoom in.

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Subscriptions & In-App Purchases

$9.99

Timegrapher Pro

More than 1 watch? Purchase Timegrapher Pro

User reviews

Great app

This is a great app. I have a Weishi 1000 Timegrapher that I used to check when it’s time to service my watches. But it is a pain to log the results. I had to manually fill out an Excel spreadsheet to check the watches’ evolution. I tried other timegrapher apps but the results vary. This is the first app that allows you to keep track of different watches and the results are pretty close to my Weishi 1000. Needless to say, I stopped using the Weishi. Also, customer service is great with Fotis answering every request personally and very fast.
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Response from developer

Thank you so much for this kind review! It’s great to hear that the app now handles the logging you used to do by hand in Excel, and that its readings come close to your Weishi 1000. That comparison means a lot, because accuracy is what we’ve worked the hardest on. Thanks also for the kind words about support. We are always happy to help, so please keep the feedback and suggestions coming. Enjoy your watches!

Developer apps

FAQ

What can Timegrapher measure?

Timegrapher measures a watch's rate (seconds gained/lost per day), amplitude (balance swing), and beat error (tick-tock asymmetry). It can also automatically detect beat rates from 18,000 to 36,000 bph.

How accurate are Timegrapher's readings?

Timegrapher uses advanced noise filtering and computes amplitude based on the specific calibre's lift angle for improved accuracy. While results are indicative, a bench machine and professional judgment remain the gold standard for service decisions.

Can I track my watch collection with Timegrapher?

Yes, you can add each watch with details like photos, serial numbers, and lift angles. Timegrapher saves all measurements and charts their performance and value over months and years.

Does Timegrapher have ads?

No, Timegrapher is private by design and does not have any advertisements. All audio processing is done on the device, and no data is recorded, stored, or uploaded.

How much does Timegrapher cost?

Your first watch analysis is free. Timegrapher Pro, which unlocks unlimited watches, is available as a one-time purchase, not a subscription.

What devices does Timegrapher support?

Timegrapher is currently supported on iPhone devices. Purchases can be restored on any device signed into the same App Store account.

How often is Timegrapher updated?

The latest version is 2.3, last updated on August 17, 2026. Updates typically include improvements to accuracy, new features, and bug fixes.

What is the age rating for Timegrapher?

Timegrapher has an age rating of 4+. This indicates it is suitable for users of all ages, with no content restrictions.