Precision Watch: Accuracy
Mechanical watch rate tracker
Free · In-App Purchases
Measure your watch's true daily accuracy in minutes — no watchmaker needed. See if it runs fast or slow, and track your whole collection over time.
Is your mechanical watch running fast or slow? Find out in minutes.
Precision Watch measures your watch's true daily accuracy by comparing it to atomic time — no expensive timegrapher and no trip to the watchmaker. Start a measurement, come back later, enter what your watch reads, and see exactly how many seconds per day your watch gains or loses.
WHY PRECISION WATCH
• Atomic-accurate — every measurement is referenced against an atomic clock
• No microphone guesswork — a reliable, repeatable method that actually works
• Track every watch — build your collection and follow each one's rate over time
• Fast & beautiful — a clean, native experience made for watch lovers
• Private — everything stays on your device, no account required
HOW IT WORKS
1. Sync your watch to the on-screen atomic clock
2. Wait — from a few minutes to several hours, your choice
3. Enter what your watch reads now
4. Get your precise +/- seconds-per-day result
Know when your watch truly needs a service — and when it doesn't. Stop guessing and start measuring.
Precision Watch Pro unlocks unlimited saved measurements and your full watch collection.
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Thanks for using Precision Watch! This update brings localization improvements and minor refinements across the app.
The developer, Louis Marion, 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 Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Identifiers
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Location
- Identifiers
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Size
- 75.1 MB
- Category
- Utilities
- Compatibility
Requires iOS 16.4 or later.
- iPhone
Requires iOS 16.4 or later. - iPad
Requires iPadOS 16.4 or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 9 more
- English, Dutch, French, German, Italian, Japanese, Korean, Portuguese, Simplified Chinese, Spanish
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Annual Pro subscription 29,99 €
- Pro Subscription 2,99 €
- Provider
Louis Marion
- Louis Marion has not identified itself as a trader for this app. If you are a consumer in the European Economic Area, consumer rights do not apply to agreements between you and the provider.
- Copyright
- © 2025 LMEI