# ClockMaster vs SlitherSense

The clearest difference is price: SlitherSense at Free against ClockMaster's $49.99. SlitherSense also leads on in-app purchases (none vs 1) and update cadence (every 2 months vs every 5 months). On ads there is nothing between them.

SlitherSense is free to download; ClockMaster costs $49.99 up front. ClockMaster sells 1 one-off in-app purchase. SlitherSense asks for nothing beyond the download.

ClockMaster ships an update every 5 months, SlitherSense every 2 months. The most recent releases landed on October 29, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | ClockMaster | SlitherSense |
| --- | --- | --- |
| Price | $49.99 | **Free** |
| Rating | **[3.8 (52 ratings)](https://appshunter.io/ios/app/clockmaster-time-regulator/id413901882/reviews)** | — |
| Number of ratings | **52** | — |
| Positive reviews | 58.6% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 2 months** |
| Monetization | Free with in-app purchases | — |
| Size | 5 MB | 13 MB |
| Requires iOS | 18.0 | **12.1** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [ONYX Apps](https://appshunter.io/developer/356553882) | [SlitherSense LLC](https://appshunter.io/developer/1670538380) |

## 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


### SlitherSense

[App page](https://appshunter.io/ios/app/slithersense/id1670538378)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is ClockMaster free?

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

### Is SlitherSense free?

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

### Do ClockMaster or SlitherSense have ads?

Neither ClockMaster nor SlitherSense shows ads.

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

ClockMaster ships an update every 5 months, and SlitherSense every 2 months. Most recently, ClockMaster was updated on October 29, 2026 and SlitherSense on October 3, 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.*