# Chronometer vs ChronoLog

The clearest difference is review sentiment: ChronoLog at 85% against Chronometer's 0%. ChronoLog also leads on price (Free vs $2.99) and rating (4.6 vs 3.1). Chronometer's advantage is in-app purchases (none vs 2). On ads, monetization model and device support there is nothing between them.

ChronoLog is free to download; Chronometer costs $2.99 up front. ChronoLog sells 2 one-off in-app purchases. Chronometer asks for nothing beyond the download.

ChronoLog holds the better App Store score, 4.6 against 3.1. That said, the two scores are not equally well evidenced: ChronoLog has 242 ratings behind it against 8, so its average is the more settled of the two. Written reviews point the same way: 0% of Chronometer's written reviews are positive against 85% of ChronoLog's.

Chronometer ships an update every 5 months, ChronoLog every 3 weeks. The most recent releases landed on November 13, 2026 and November 14, 2026 respectively.

## The numbers

| Metric | Chronometer | ChronoLog |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | [3.1 (8 ratings)](https://appshunter.io/ios/app/chronometer/id1562013733/reviews) | **[4.6 (242 ratings)](https://appshunter.io/ios/app/chronolog-watch-accuracy/id6452083510/reviews)** |
| Number of ratings | 8 | **242** |
| Positive reviews | 0.0% of reviews | **85.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 3 weeks** |
| Monetization | Paid | Paid |
| Size | 3 MB | 50 MB |
| Requires iOS | 18.6 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Kilian Eisenegger](https://appshunter.io/developer/1333678887) | [tyler wood](https://appshunter.io/developer/1698739777) |

## What reviewers say

### Chronometer

[App page](https://appshunter.io/ios/app/chronometer/id1562013733)

Easily track your watch's accuracy against atomic time. Simply set your watch to atomic time, take a photo of the dial within the app, and record the difference. Analyze daily deviations over 15 days to assess your watch's performance.

**Highlights:** Track daily watch accuracy, Compare against atomic time, Photo capture for time reading, Altitude recording, Save data in CSV format, Analyze 15-day data trends

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is Chronometer free?

Chronometer costs $2.99, with no in-app purchases.

### Is ChronoLog free?

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

### Which has better reviews, Chronometer or ChronoLog?

ChronoLog is rated higher. Chronometer averages 3.1 out of 5 from 8 ratings, while ChronoLog averages 4.6 from 242 ratings.

### Do Chronometer or ChronoLog have ads?

Neither Chronometer nor ChronoLog shows ads.

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

Chronometer ships an update every 5 months, and ChronoLog every 3 weeks. Most recently, Chronometer was updated on November 13, 2026 and ChronoLog on November 14, 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.*