# Time Calibrator vs Clock Seconds

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.

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.

## The numbers

| Metric | Time Calibrator | Clock Seconds |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.7 (3 ratings)](https://appshunter.io/ios/app/time-calibrator/id786988278/reviews) | **[5.0 (4 ratings)](https://appshunter.io/ios/app/clock-seconds/id6446502527/reviews)** |
| Number of ratings | 3 | **4** |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 4 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 8 MB | 22 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Atomtime Suisse S.A.](https://appshunter.io/developer/786988281) | [David Engler - Apps](https://appshunter.io/developer/1678138767) |

## What reviewers say

### Time Calibrator

[App page](https://appshunter.io/ios/app/time-calibrator/id786988278)

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.

**Highlights:** Accurate global time and date, Connects to Swiss atomic clock server, Quantum technology data transmission, Direct communication to i-Atomic watches, Light signal synchronization

**Features:** macOS Compatibility

**In-app purchases:** none


### Clock Seconds

[App page](https://appshunter.io/ios/app/clock-seconds/id6446502527)

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.

**Highlights:** 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

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $2.99 | one-time |
| Unlock | $9.99 | one-time |


## Frequently asked questions

### Is Time Calibrator free?

Time Calibrator is free to download, with no in-app purchases.

### Is Clock Seconds free?

Clock Seconds is free to download, with in-app purchases available.

### Which has better reviews, Time Calibrator or Clock Seconds?

Clock Seconds is rated higher. Time Calibrator averages 2.7 out of 5 from 3 ratings, while Clock Seconds averages 5.0 from 4 ratings.

### Do Time Calibrator or Clock Seconds have ads?

Neither Time Calibrator nor Clock Seconds shows ads.

### Which is updated more often, Time Calibrator or Clock Seconds?

Time Calibrator ships an update every 8 months, and Clock Seconds every 4 weeks. Most recently, Time Calibrator was updated on August 24, 2026 and Clock Seconds on September 15, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*