# Clockwork - Watch app — Track Mechanical Accuracy > Measure watch accuracy using photos and an atomic clock. (iPhone/iPad app by Appfred AS.) - Source: https://appshunter.io/ios/app/clockwork-watch-app/id1612061033 (this page in markdown: same URL + `.md`) - Developer: [Appfred AS](https://appshunter.io/developer/1612061035) - Category: Utilities, Productivity - Price: Free with in-app purchases - Rating: 4.38/5 from 24 App Store ratings · 28 written reviews indexed - Age rating: 4+ - Requires: iOS 16.4 · 242 MB - Languages: English - Released: 2022-04-01 - Data updated: 2026-09-11 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/clockwork-watch-app/id1612061033/reviews.md ## What is Clockwork? Measure the accuracy of your watches today! Clockwork includes several useful features. You can store watch information, measure watch accuracy, and set your watch using a clock synchronized with atomic time. Check it out now! _MEASUREMENTS USING IMAGES_ Most other watch measurement apps require either third-party equipment or that you press a button at a specific time. Additional equipment is often expensive, and timing a button press is difficult to do precisely. Clockwork solves this by letting you take a picture of your watch and indicate the time shown in the image. We then synchronize the image capture time with atomic time before comparing it with the time shown on the watch to calculate an offset. Taking measurements over time provides a real-world view of your watch's accuracy. _GRAPHS_ Watch your measurements over time on a beautifully crafted graph. The graph shows how your watch's accuracy changes over time and offers several modes to help you understand its performance. _WHY MEASURE?_ Knowing the accuracy of your watch is interesting on its own, but it also has several practical uses. It can indicate when it is time for a service, and documented accuracy could increase resale value, especially for vintage watches. _STORE DETAILED INFORMATION_ In case of theft or accidents, it will always help to have your information stored in a secure place. _ATOMIC CLOCK, DARK MODE AND MUCH MORE!_ Clockwork includes an atomic clock in both digital and analog formats to help you set your watch as precisely as possible. Powerful settings such as Dark or Light mode, separate day and date formats, and different ways to sort your watches let you customize the app to your liking. // Appfred AS © 2026 ## Key features - Measure accuracy using images - Atomic clock synchronization - Accuracy over time graphs - Store detailed watch information - Dark mode support - Digital and analog atomic clock ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Clockwork Premium | $5.99 | one-time | ## Recent user reviews (10 of 28) All indexed reviews: https://appshunter.io/ios/app/clockwork-watch-app/id1612061033/reviews.md ### 3/5 — Please add a zoom when taking a picture *2026-09-03* 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 **Developer response:** Thank you for the feedback! We have thought about this issue, and come up with something we think works even better than manual zoom buttons. In the latest versions of the app, we detect where your watch is on the camera feed, so we can make sure your watch is always in focus. Also, when you take the picture of your watch, we again detect where the watch is on the image and crop around it, to make it look bigger. This way, you do not need to select a zoom level on your own, as you Watch will fill the whole image. If the image is not clear enough when inserting the time, you can always zoom in on the image of the watch there, by using two fingers on the image. If you have any other feedback or requests for the app, do not hesitate to contact us on clockwork.watch.app@gmail.com! Best regards, The Clockwork - Watch app team ### 2/5 — Please add a zoom when taking a picture *2026-03-05* 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. ### 2/5 — Pointless trial *2025-01-31, version 1.3.5* It took a nice picture but that was it. The app didn’t take a note of the watch time so only recorded the atomic clock time with no delta. I deleted the app. ### 3/5 — App closing *2025-01-28* Now on IOS 18.3 the app open and close immediately ### 1/5 — Very inaccurate *2025-01-19, version 1.3.5* Tried the free version to begin with and it looked like it was giving a reasonable and believable result (given the limited five measurements you get with the free version). I paid for the full version and added three watches. These were all quartz analog watches and known to be very accurate (as checked with my radio-controlled watch). However, I got some very odd results. Two of the watches returned -2.5 and -3.5 seconds per day while the third was apparently -74.3s/day! This is a very large amount for a quartz watch and would have been obvious to me previously as I compared them to my radio-controlled watch. As a test I measured my radio-controlled watch (which never fails to pick up the time signal) and the app says it’s +7.7 seconds / day! This really is a terribly inaccurate and unreliable app. I contacted the developer but never received a reply. I just wanted to know if there was anything I was doing wrong as there aren’t and real instructions. I got a refund as this app clearly needs some work. ### 3/5 — Great simple app *2024-12-13, version 1.3.3* Seems to work well for relative tracking - just don’t understand why when setting the watch with the displayed atomic clock to the correct time the measurement using an image says its 2 seconds slow - so there is a difference of about 2 seconds between the two? ### 2/5 — Camera not up to snuff *2024-11-27* The app is ok to track accuracy. I like that the app lets me stay timed accurately. However, the camera doesn’t adjust to distance and the pics are out of focus. I merely wait to take a pic as a I observe the seconds hand at 12 o’clock or a known spot. When I snap the pic and it’s used as a stopwatch. If there is a fix please let me know. **Developer response:** That is a clever workaround indeed, but I am glad to say that the camera focus issues has been fixed in the latest release! Update the app an give it should be fixed - Alfred ### 2/5 — Please fix write a review feature *2024-11-19* Keeps asking over and over. Seriously annoying after each measurement. App is good otherwise **Developer response:** Thanks for letting us know, sounds annoying indeed. We will have a look at this issue soon! ### 5/5 — Very easy & intuitive *2024-11-18* Great UX/UI for recording exact times. Very easy and intuitive. Thank you. ### 1/5 — Doesn't work, I can' even enter the data in manually *2024-11-11* Photo method is always significantly incorrect even in good lighting. I asked if they could release a manual time set feature and they said no. This app is useless to me when it can't register the time of my watch. Ipad mini 6. Cannot use camera focus ## Frequently asked questions about Clockwork ### 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. ## Version history (last 5 releases) ### 1.4.4 — 2026-09-07 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. ### 1.4.3 — 2026-09-01 More accurate measurement times We’ve improved how Clockwork handles 12-hour input, atomic-time corrections, and measurements around midnight. More reliable camera capture Taking a measurement is now more reliable while live watch detection is running. Clearer measurement history Group headers are easier to scan, with cleaner dates, consistent arrows, and improved dark-mode contrast. ### 1.4.2 — 2026-08-25 Reliable measurement saving Fixed an issue that prevented some users from saving their measurements. ### 1.4.1 — 2026-08-21 Choose your measurement time Start with the predicted watch time or atomic time. Set an app default and override it for individual watches. More reliable predictions Improved watch detection and image cropping make predictions more reliable. Unlikely results now fall back safely to atomic time. Smoother camera experience Watch detection and measurement capture are now more reliable. ### 1.4.0 — 2026-08-14 Smarter graphs Graphs now show measurement points more clearly and automatically adapt the height as you zoom and drag. Clearer measurements Measurements are now grouped, with seconds per day visible at a glance. Smoother sign-in Signing in with an email link now takes you reliably back into the app. Reliable reminders Measurement reminders are now cleared correctly when you delete a measurement or watch, or sign out. ## Apps similar to Clockwork | App | Rating | Price | Category | | --- | --- | --- | --- | | [Watch Tuner Timegrapher](https://appshunter.io/ios/app/watch-tuner-timegrapher/id991367080) | 3.8 (80) | $7.99 | Utilities | | [TickTracer - Watch Accuracy](https://appshunter.io/ios/app/ticktracer-watch-accuracy/id6474094486) | 4.3 (9) | Free | Utilities | | [Twelve O'clock](https://appshunter.io/ios/app/twelve-oclock/id1570977980) | 4.4 (82) | Free | Utilities | | [ChronoLog • Watch Accuracy](https://appshunter.io/ios/app/chronolog-watch-accuracy/id6452083510) | 4.6 (204) | Free | Utilities | | [Timegrapher - watch accuracy](https://appshunter.io/ios/app/timegrapher-watch-accuracy/id6450460771) | 2.8 (44) | Free | Utilities | | [Watch Tracker](https://appshunter.io/ios/app/watch-tracker/id610666926) | 4.7 (322) | $4.99 | Utilities | ## More apps by Appfred AS - [Guess the Imposter: Spy Games](https://appshunter.io/ios/app/guess-the-imposter-spy-games/id6758518858) All apps by Appfred AS: https://appshunter.io/developer/1612061035 ## Related topics [chronolog • watch accuracy](https://appshunter.io/ios/topics/chronolog-watch-accuracy) · [watch regulator](https://appshunter.io/ios/topics/watch-regulator) · [toolwatch](https://appshunter.io/ios/topics/toolwatch) · [clickwork applications](https://appshunter.io/ios/topics/clickwork-applications) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-11.*