The best companion app for your mechanical watch.


• Set your watch precisely with a full-screen atomic clock.
• Track your watches’ accuracy over time with beautiful charts. Trend lines tell you how your watch is performing and let you know when it’s time for service.

Atomic Clock

The “Atomic Clock” tab is a precise clock you can use to set your mechanical watch to the second.


On the “Watches” tab, add and name each of the watches you want to track. Tap “Add Point” to add a measurement. Wait until your watch’s hands match what’s shown on the screen, then tap the screen. This will add a point to the chart, recording if your watch was ahead or behind, and by how much. Repeat this over time and you will start to see trend lines with an estimate of your watch’s accuracy.

If your watch gains or loses 3s/day or less... congratulations! You have a chronometer-quality piece. If your watch gains or loses more than 60s/day, it might be in need of service.

When adding a measurement, if your watch is ahead of the time shown on the screen, or significantly behind, you can adjust the target time to get closer. Use the -5 and +5 buttons until the hands are slightly ahead compared to your watch, then wait for your watch to catch up, and tap.


• When you add a point, the hands on the screen automatically jump ahead by 5 seconds. This is so you can add a new point 5 seconds later. Do this a few times in a row to increase the accuracy of your measurements.
• When you reset your watch, our AI will attempt to detect that and start a new trendline for you. However, even though it’s 2020, the AI sometimes gets it wrong. If that happens, not to worry, force-press or long-tap on a point to reveal a “Split Here” or “Do Not Split Here” button. You get to lord over the AI. For now.
• To remove a point, force-press or long-tap on it to bring up a delete button.
• Multiple points taken within 30 seconds of each other will cluster together and their average will count as a single measurement. Long-tap on a cluster to see and edit the individual points within.
• If you have iCloud enabled, you can find raw data, with all your measurements, in your iCloud Drive. The data is in the standard CSV format, supported by Excel, Numbers, Google Sheets, and many other apps.

What’s New

Version 2.0

Our top requested feature is here! You can now manually split or join runs.

When you reset your watch, our AI attempts to detect that and start a new trendline for you. However, even though it’s 2020, the AI sometimes gets it wrong. If that happens, not to worry, you can now force-press or long-tap on a point to reveal a “Split Here” or “Do Not Split Here” button. You get to lord over the AI. For now.

Thank you for using Movement. If you like the app and want to see more updates like this, please help spread the word!

Ratings and Reviews

4.7 out of 5
13 Ratings

13 Ratings

derekbot3000 ,

Beautiful app, look forward to future updates and feature

I’ve been searching for a great app to measure my mechanical watch accuracy. After trying a couple other top apps in the store I was excited to see this one appear.
Looks perfect on the iPhone Xs screen. Fits in perfectly with iOS’s style but looks unique in its own right.
It is rather minimal in features but the core functions (atomic clock, watch accuracy tracking is great). I hope some more robust feature can be added in the future. I would love to be able to edit mistake points on the graph, add more information on the watch like year or purchase date, iCloud sync, and notification reminder if desired.
Great app! Thanks!
[Update] iCloud sync and deleting points have been added since first review. Great support from devs. Thanks!!

Developer Response ,

Thanks for the kind words! We’ve added iCloud sync and the option to delete points in the graph. Please try the new version and let us know how you like it. (P.S. - Reminders are coming soon!)

nitodev ,

Good updates

Liked the last update you made where you can split the graph for when you recalibrate the watch to a reference time.

But there’s still a lot to improve.

For one, I want to be able to see the time graph more in detail. I only see week indications so I can’t properly examine how long it’s been since I reset the watch.

Building on to this, the graphs should be zoomable. This way, I can see more time indications as well as navigating very long graphs.

Last thing for now is that the loss/gain rates that show at the bottom in red can clump up together when they’re short, making it completely illegible.

Looking forward to the next update. I use it almost daily.

koffee66 ,

Beautifully designed and thoughtful app

The app is thoughtfully designed and beautiful to look at. The haptics on the ticking second hand are a nice touch. Good set of functionality and excited to see where the developer takes it. Fills a real niche in the market.

Developer Response ,

Thanks! We’re flattered. New features are coming soon! Feel free to email us with any other ideas or suggestions.


Rational Creation LLC
18.6 MB

Requires iOS 9.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

You May Also Like