# ClockMaster vs ChronoLog

The clearest difference is price: ChronoLog at Free against ClockMaster's $49.99. ChronoLog also leads on rating (4.6 vs 3.8) and update cadence (every 3 weeks vs every 5 months). On ads and in-app purchases there is nothing between them.

ChronoLog is free to download; ClockMaster costs $49.99 up front. ClockMaster sells 1 one-off in-app purchase and ChronoLog sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ChronoLog holds the better App Store score, 4.6 against 3.8. Both are backed by a comparable volume of ratings — 52 and 204 respectively. Written reviews point the same way: 59% of ClockMaster's written reviews are positive against 85% of ChronoLog's.

ClockMaster ships an update every 5 months, ChronoLog every 3 weeks. The most recent releases landed on September 25, 2026 and September 26, 2026 respectively.

## The numbers

| Metric | ClockMaster | ChronoLog |
| --- | --- | --- |
| Price | $49.99 | **Free** |
| Rating | [3.8 (52 ratings)](https://appshunter.io/ios/app/clockmaster-time-regulator/id413901882/reviews) | **[4.6 (204 ratings)](https://appshunter.io/ios/app/chronolog-watch-accuracy/id6452083510/reviews)** |
| Number of ratings | 52 | **204** |
| Positive reviews | 58.6% of reviews | **84.8% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 3 weeks** |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 5 MB | 49 MB |
| Requires iOS | 18.0 | **13.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [ONYX Apps](https://appshunter.io/developer/356553882) | [tyler wood](https://appshunter.io/developer/1698739777) |

## What reviewers say

### ClockMaster

[App page](https://appshunter.io/ios/app/clockmaster-time-regulator/id413901882)

This app analyzes the ticking sound of mechanical pendulum clocks to determine their running rate and error. It's designed for accurate long-term measurements, allowing users to regulate clocks efficiently. Advanced features include printable reports and data export for in-depth analysis.

**Highlights:** Analyzes escapement ticking sound, Measures running rate in Beats Per Hour (B/H), Reports error in Seconds Per Day (±S/D), Supports long-term measurements, Generates printable PDF reports (Pro), Exports raw data as .csv file (Pro)

**Features:** Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ClockMaster Pro | $29.99 | one-time |

**What reviewers like**

- 👍 Works very well
- 👍 Accurately sets beat and calibrates time
- 👍 Good alternative to expensive dedicated instruments
- 👍 Elegant display for setting beat and symmetry
- 👍 Works well for professional clock repairers

**What reviewers complain about**

- 😞 Frustrating data handling
- 😞 Spreadsheet export issues
- 😞 iPhone notifications stop measurements
- 😞 Does not work for 400-day clocks
- 😞 External mic option missing

**Reported bugs**

- Data lost if app stops unexpectedly
- iPhone notifications interrupt measurements
- External mic option not available
- App freezes after iOS upgrade
- Screen touch points unresponsive

**Requested features**

- Printable protocol like a timegrapher
- Beat delta info on regulation screen
- Option to manually restart measurement and append
- Undocumented units in spreadsheet export
- Include actual time in spreadsheet export


### 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 ClockMaster free?

ClockMaster costs $49.99, and also offers in-app purchases.

### Is ChronoLog free?

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

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

ChronoLog is rated higher. ClockMaster averages 3.8 out of 5 from 52 ratings, while ChronoLog averages 4.6 from 204 ratings.

### Do ClockMaster or ChronoLog have ads?

Neither ClockMaster nor ChronoLog shows ads.

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

ClockMaster ships an update every 5 months, and ChronoLog every 3 weeks. Most recently, ClockMaster was updated on September 25, 2026 and ChronoLog on September 26, 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.*