# ChronoLog vs ClockSync

The clearest difference is price: ChronoLog at Free against ClockSync's $0.99. ChronoLog also leads on iOS requirement (15.0 vs 26.0). ClockSync's advantage is in-app purchases (none vs 2). On update cadence, ads and device support there is nothing between them.

ChronoLog is free to download; ClockSync costs $0.99 up front. ChronoLog sells 2 one-off in-app purchases. ClockSync asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on November 3, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | ChronoLog | ClockSync |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[4.6 (236 ratings)](https://appshunter.io/ios/app/chronolog-watch-accuracy/id6452083510/reviews)** | — |
| Number of ratings | **236** | — |
| Positive reviews | 85.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Monetization | Paid | — |
| Size | 50 MB | 4 MB |
| Requires iOS | **15.0** | 26.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [tyler wood](https://appshunter.io/developer/1698739777) | [Elegant Chaos Limited](https://appshunter.io/developer/1212020544) |

## What reviewers say

### ChronoLog

[App page](https://appshunter.io/ios/app/chronolog-watch-accuracy/id6452083510)

This app provides professional-grade tools to track the accuracy of mechanical watches. It offers audio timegraphing, photo offset measurement, and tap timing, along with detailed analytics and atomic time synchronization for collectors and enthusiasts.

**Highlights:** Audio timegrapher for rate, beat error, and amplitude, Photo offset measurement against atomic time, Tap timing for quick offset logging, Track accuracy trends over time, Atomic time synchronization, Detailed performance graphs and analytics, Manage and organize watch collection

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $5.99 | one-time |
| Premium | $6.99 | one-time |


### ClockSync

[App page](https://appshunter.io/ios/app/clocksync/id6761755965)

**In-app purchases:** none


## Frequently asked questions

### Is ChronoLog free?

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

### Is ClockSync free?

ClockSync costs $0.99, with no in-app purchases.

### Do ChronoLog or ClockSync have ads?

Neither ChronoLog nor ClockSync shows ads.

### Which is updated more often, ChronoLog or ClockSync?

ChronoLog ships an update every 3 weeks, and ClockSync every 3 weeks. Most recently, ChronoLog was updated on November 3, 2026 and ClockSync on November 5, 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.*