Time Calibrator vs Clock Seconds
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.
Clock Seconds
A highly accurate and customizable digital clock that fills your screen. Offers adjustable colors, sizes, and 12/24 hour formats. Designed for minimal battery usage.
- Largest digital clock display
- Accurate atomic time comparison
- Customizable colors and dimensions
- 12/24 hour format options
- Minimal battery consumption design
- Portrait mode settings access
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Largest and most accurate digital clock to fit your screen, with customizable colors, dimensions, 12/24 hour modes, atomic (compare to https://time.gov) , and more. To customize the clock use Portrait, tap the clock to show / hide settings. The app was designed to minimize battery consumption on your device. Compare accuracy to https://time.gov
Screenshots
Verdict
The clearest difference is rating: Clock Seconds at 5.0 against Time Calibrator's 2.7. Clock Seconds also leads on update cadence (every 4 weeks vs every 8 months) and iOS requirement (13.0 vs 15.6). Time Calibrator's advantage is in-app purchases (none vs 2). On price, ratings volume, ads and device support 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. Clock Seconds sells 2 one-off in-app purchases. Time Calibrator asks for nothing beyond the download.
Clock Seconds holds the better App Store score, 5.0 against 2.7. Both are backed by a comparable volume of ratings — 3 and 4 respectively.
Time Calibrator ships an update every 8 months, Clock Seconds every 4 weeks. The most recent releases landed on August 24, 2026 and September 15, 2026 respectively.
| Parameter | Time Calibrator | Clock Seconds |
|---|---|---|
| Price | Free | Free |
| Rating | 2.7 (3 ratings) | 5.0 (4 ratings) — better |
| Positive reviews | 33.3% of reviews | — |
| Number of ratings | 3 | 4 — better |
| Update frequency | Every 8 months | Every 4 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 13.0 — better |
| Further details — not scored | ||
| Size | 8 MB | 22 MB |
| Age rating | 4+ | 4+ |
| Developer | Atomtime Suisse S.A. | David Engler - Apps |
Customer experience
Time Calibrator
Clock Seconds
In-app purchases
Time Calibrator
No in-app purchases
Clock Seconds
- Remove Ads$2.99
- Unlock$9.99
Questions
Is Time Calibrator free?
Is Clock Seconds free?
Which has better reviews, Time Calibrator or Clock Seconds?
Do Time Calibrator or Clock Seconds have ads?
Which is updated more often, Time Calibrator or Clock Seconds?
Other comparisons
