Time Calibrator vs Clockwork
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Time Calibrator
This utility app provides precise local time and date information by connecting to an atomic clock server in Switzerland. It utilizes quantum technology to transmit this data at the speed of light directly to compatible i-Atomic watches.
- Accurate global time and date
- Connects to Swiss atomic clock server
- Quantum technology data transmission
- Direct communication to i-Atomic watches
- Light signal synchronization
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This app is designed for i-Atomic watches users Welcome to Time Calibrator! Time Calibrator has been specifically designed to deliver accurate time information to people all around the globe. The app connects automatically to the atomic clock server in Switzerland to display the exact local time and date. Through quantum technology, the information travels at the speed of light from the NTP server and is communicated directly to AtomTime i-Atomic watches via light signals.
Clockwork
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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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
Screenshots
Verdict
The clearest difference is rating: Clockwork at 4.4 against Time Calibrator's 2.7. Clockwork also leads on update cadence (every 3 weeks vs every 8 months) and ratings volume (24 vs 3). Time Calibrator's advantage is in-app purchases (none vs 1) and device support (3 vs 1). On price, ads and iOS requirement there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Clockwork sells 1 one-off in-app purchase. Time Calibrator asks for nothing beyond the download.
Clockwork holds the better App Store score, 4.4 against 2.7. That said, the two scores are not equally well evidenced: Clockwork has 24 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 33% of Time Calibrator's written reviews are positive against 43% of Clockwork's.
Time Calibrator ships an update every 8 months, Clockwork every 3 weeks. The most recent releases landed on August 24, 2026 and September 11, 2026 respectively.
| Parameter | Time Calibrator | Clockwork |
|---|---|---|
| Price | Free | Free |
| Rating | 2.7 (3 ratings) | 4.4 (24 ratings) — better |
| Positive reviews | 33.3% of reviews | 42.9% of reviews — better |
| Number of ratings | 3 | 24 — better |
| Update frequency | Every 8 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 15.6 — better | 16.4 |
| Further details — not scored | ||
| Size | 8 MB | 242 MB |
| Age rating | 4+ | 4+ |
| Developer | Atomtime Suisse S.A. | Appfred AS |
Customer experience
Time Calibrator
Clockwork
In-app purchases
Time Calibrator
No in-app purchases
Clockwork
- Clockwork Premium$5.99
Questions
Is Time Calibrator free?
Is Clockwork free?
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