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Ratekeeper: Watch Accuracy

Ratekeeper: Watch Accuracy

Measure your watch's accuracy

2 ratings
2 reviews
🔧 Utilities
Free
In-App Purchases

Details

  • Released
  • Updated
  • September 1, 2026
  • September 2, 2026

Features

Developer

Slow Sunday Software LLC
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Ratekeeper: Watch Accuracy screenshot #1 for iPhone
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Ratekeeper: Watch Accuracy screenshot #5 for iPhone
iphone
ipad
🧾$4.99
In-App Purchase↘︎
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❓8 answered
FAQ↘︎
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About

Measure the daily accuracy of your mechanical watch without specialized equipment. Simply tap when your watch's second hand aligns with true time, and the app calculates its rate. Track historical data, compare against specifications, and analyze performance by resting position.

✓Measures watch rate in seconds per day
✓Historical data tracking and charting
✓Comparison against specified accuracy bands
✓Analysis of rate by resting position
✓Standalone true-time reference clock
✓Export readings to CSV
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What's New in Ratekeeper

1.0.1

September 2, 2026

Regulated a few bugs out of the movement. Ratekeeper should run a little closer to spec now.

1

In-App Purchases

$4.99

Unlock the entire app

The full record and multiple watches.

User reviews

Most RecentHighest RatedLowest Rated

Clean, accurate, and no subscription

Really well-made app. UI is super clean, no ads, and it doesn't force you into an account or a monthly fee. Just paid the one-time unlock to add the rest of my collection. Highly recommend if you care about your watch accuracy.
Doppelfederhaus24Doppelfederhaus24

Great tool!

As an owner of a few watches that I rotate, this is so helpful to ensure they are synced and ready to go. I found out that one of them had significant drift and was losing eight seconds a day, which means I probably need to service it. Now I can ensure they are in the best possible condition.
App is simple and easy to use.
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TinaWexTinaWex

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FAQ

How does Ratekeeper measure watch accuracy?

Ratekeeper uses a simple method: you tap the screen when your watch's second hand aligns with true atomic time. The app then compares this tap to the atomic network time, accurate to hundredths of a second, to calculate your watch's rate in seconds per day.

Does Ratekeeper have ads?

No, Ratekeeper is ad-free. The app is designed to be private by default, with no ads and no data collection.

What devices does Ratekeeper support?

Ratekeeper is available for iPhone and iPad devices.

Can I export my watch accuracy data from Ratekeeper?

Yes, you can export every reading to CSV format whenever you like, ensuring you keep your data.

How often is Ratekeeper updated?

The latest version is 1.0.1, last updated on September 2, 2026. While specific update frequency isn't detailed, the app is actively maintained.

What is the age rating for Ratekeeper?

Ratekeeper has an age rating of 4+, making it suitable for a wide range of users.

Does Ratekeeper require an account or sign-up?

No, Ratekeeper is private by default and does not require an account or sign-up. Your data stays on your device and syncs privately via iCloud.

Can Ratekeeper help me adjust my watch's resting position?

Yes, Ratekeeper breaks down the rate by resting position (dial up, crown down, etc.) and can suggest how to rest your watch to improve its accuracy.