Clockwork - Watch app

Clockwork - Watch app

Track Mechanical Accuracy

24 ratings
33 reviews
Free
In-App Purchases

Details

Released
April 1, 2022
Updated
September 7, 2026

Features

Clockwork - Watch app screenshot #1 for iPhone
Clockwork - Watch app screenshot #2 for iPhone
Clockwork - Watch app screenshot #3 for iPhone
Clockwork - Watch app screenshot #4 for iPhone
Clockwork - Watch app screenshot #5 for iPhone
Clockwork - Watch app screenshot #6 for iPhone
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About

This app allows you to measure the accuracy of your watches using your phone's camera. It compares an image of your watch to an atomic clock to calculate its timekeeping offset. Track accuracy over time with graphs and store detailed watch information.

✓Measure accuracy using images
✓Atomic clock synchronization
✓Accuracy over time graphs
✓Store detailed watch information
✓Dark mode support
✓Digital and analog atomic clock
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What's New in Clockwork

1.4.4

September 7, 2026

Share your results Create a visual summary of your watch’s accuracy and share it directly from the watch detail screen. Payment fixes We fixed an issue affecting premium payments.

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Subscriptions & In-App Purchases

$5.99

Clockwork Premium

This purchase opens premium features

User reviews

Please add a zoom when taking a picture

It’s really hard talking a picture without being able to zoom in. I need a 2x, 1x, and 0.5x zoom button for my iPhone Pro Max, which has 3 different cameras on the back. It’s too small to see otherwise, and getting closer only results in a blurry picture.

Update: the new version 1.4.3 is very cool in how it will crop out the watch and attempt to audio-detect the time. But it’s still only a virtual zoom, and leaves me with a low resolution picture of the face of my watch which makes reading the time quite hard. I still need a physical hardware zoom. But I appreciate your effort and your response. Keep up the good work
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No se me activa la versión de pago

Tiene muy buena pinta, pero no se me activa la versión de pago. De momento he desestimado la compra. A ver si en la siguiente actualización me deja comprarlo.

Broken in last update

Since the latest update I can no longer capture the time for tracking. Clicking the camera button is not triggering the time capture, nothing is happening. I tried using atomic time and prediction mode and both don’t do anything now. Please fix asap.

Please add a zoom when taking a picture

It’s really hard talking a picture without being able to zoom in. I need a 2x, 1x, and 0.5x zoom button for my iPhone Pro Max, which has 3 different cameras on the back. It’s too small to see otherwise, and getting closer only results in a blurry picture.

Muy fácil de usar

Estupenda. Lo único que faltaría una representación un poco más clara de los gráficos

Developer apps

FAQ

How does this app measure watch accuracy?

The app uses your phone's camera to take a picture of your watch. It then synchronizes the image capture time with an atomic clock and compares it to the time displayed on your watch in the image to calculate any offset.

What are the benefits of measuring watch accuracy?

Measuring accuracy can indicate when your watch might need servicing. Consistent accuracy can also increase a watch's resale value, particularly for vintage timepieces.

Does the app require any special equipment?

No, unlike many other watch measurement apps, this app does not require any third-party equipment. It relies solely on your phone's camera and an atomic clock sync.

Can I track my watch's accuracy over time?

Yes, the app features beautifully crafted graphs that allow you to visualize your watch's accuracy measurements over time. These graphs can show trends and inform you about your watch's performance.

Is there a cost associated with using this app?

The app is free to download and use, but it offers in-app purchases. These purchases likely unlock additional features or customization options beyond the core functionality.