# ClockMaster - Time Regulator — Pendulum Clock Time Regulation

> Mechanical pendulum clock timing and regulation software using sound analysis. (iPhone/iPad app by ONYX Apps.)

- Source: https://appshunter.io/ios/app/clockmaster-time-regulator/id413901882 (this page in markdown: same URL + `.md`)
- Developer: [ONYX Apps](https://appshunter.io/developer/356553882)
- Category: Utilities
- Price: $49.99 with in-app purchases
- Rating: 3.80/5 from 52 App Store ratings · 70 written reviews indexed
- Age rating: 4+
- Requires: iOS 18.0 · 5 MB
- Released: 2011-01-18
- Data updated: 2026-08-30
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/clockmaster-time-regulator/id413901882/reviews.md

## What is ClockMaster?

>>> Check out the demo videos at ClockMasterApp.com

ClockMaster is a clock timing software, in many ways similar to watch timegraphers, but specifically designed to work with mechanical pendulum clocks. The app analyzes the ticking sound of the escapement to determine the clock's running rate measured in Beats Per Hour (B/H). This rate is then compared to a specified Target Rate, and the Error is reported as Seconds Per Day fast or slow (±S/D).

The speed of a mechanical pendulum clock is not constant, fluctuating with age and wear, spring tension and even temperature. The ClockMaster app was created with a focus on accurate long-term measurements where traditional timers often do not function very well.

For the professional horologist or interested amateur, you can now test in the field — put the clock in exact beat and regulate the clock with just a few hours of testing. For increased rate accuracy and in depth investigation of clock movement's behavior, you can conduct long-term measurements for up to two weeks (ClockMaster Pro). Branded, printable PDF reports can be generated for each measurement, and the raw data exported as .csv file for graphing in a spreadsheet (ClockMaster Pro). 

ClockMaster Pro (in-app upgrade) provides these additional features:

• Save and share branded, printable PDF reports for each measurement
• Export raw measurement data as a .csv file for spreadsheet analysis
• Conduct long-term measurements of up to two weeks

## Key features

- 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)

## Pricing and in-app purchases

Base price: $49.99.

**One-time purchases**

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


## What do users think of ClockMaster?

Overall sentiment: mixed

**Pros**

- 👍 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
- 👍 Great for timing ship's bell clocks
- 👍 Helpful for servicing and repairing pendulum clocks
- 👍 Useful for antique clock accuracy
- 👍 Tunes grandfather clock movements
- 👍 Picks up pendulum clicks well
- 👍 Easy to use and graph outputs
- 👍 Useful for church clock regulation
- 👍 Great for setting grandfather clock beat and regulation
- 👍 Enables quick and easy clock regulation
- 👍 Reduces error significantly
- 👍 Great for setting beat and regulating movement
- 👍 Cheaper than a timing machine
- 👍 Useful for setting up mechanical clocks
- 👍 Superb for antique clock collection
- 👍 Precise and impressive accuracy
- 👍 Makes setting beat a breeze
- 👍 Works as advertised
- 👍 Great tool for fine-tuning clocks

**Cons**

- 😞 Frustrating data handling
- 😞 Spreadsheet export issues
- 😞 iPhone notifications stop measurements
- 😞 Does not work for 400-day clocks
- 😞 External mic option missing
- 😞 Expensive sensor not working
- 😞 Confused by background noise
- 😞 Auto function for BPH estimation failed
- 😞 Internal mic not sensitive enough
- 😞 Inaccurate readings
- 😞 Expensive upgrade costs
- 😞 Does not stabilize average numbers
- 😞 Inaccurate projected daily gain/loss
- 😞 Not sensitive to watches
- 😞 Screen touch points unresponsive
- 😞 Hidden costs for useful features
- 😞 Useless for watch precision
- 😞 Inaccurate measurement algorithm
- 😞 App freezes after iOS upgrade
- 😞 Steep price for standard version
- 😞 Cannot distinguish tic toc from background noise
- 😞 Does not provide +/- for beat setting
- 😞 Assumes integer BPM, leading to errors
- 😞 Claims to tell speed but cannot know correct rate

**Commonly 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
- Help section incomplete

**Most 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
- Ability to set BPH to 480 for 400-day clocks
- Plots for drift rate and periodic error within the app
- Mic that works with the app
- External mic option
- More detailed graphs
- Option to upgrade for $5 instead of $20
- Better GUI and interface
- Indication of which half of the cycle is longer/shorter

## Recent user reviews (10 of 70)

All indexed reviews: https://appshunter.io/ios/app/clockmaster-time-regulator/id413901882/reviews.md

### 4/5 — Funktioniert sehr gut

*2026-01-25*

Habe diese App nun schon seit einiger Zeit in der Anwendung.
Man muss sich etwas Zeit nehmen, aber sie funktioniert wunderbar und macht genau was sie soll. Ich würde mir nur wünschen, dass man das Protokoll wie bei einer richtigen Zeitwaage auch ausdrucken könnte.

### 5/5 — Best Tool In My Toolbox

*2025-02-21*

I have a very old Seth Thomas 30 day gallery clock and I was able to easily set the beat and calibrate the time. Thanks for the great app.

**Developer response:** Thanks! Glad you like it!

### 3/5 — Good but very frustrating

*2025-02-08*

The app performs beat measurement very well. That said, the app does have some very frustrating aspects, which, in my opinion, call into question the value of paying extra for the spreadsheet export.
 
At the top of my list of frustrations is the way data is handled. It appears to be streamed to memory rather than saved directly to a file. As a result, if the app stops unexpectedly, all recorded data from the current session is lost. This is utterly infuriating after one or two weeks of measurement, and it could be easily avoided by streaming data to a file rather than relying on a memory dump at the end. I cannot emphasise enough how frustrating this is. A far better approach would be to open a new file for each measurement and continuously write to it, with the option to append to the most recent file when starting a new session.
 
The spreadsheet exported has its own minor issues., the units are undocumented leaving you to guess (at least, I couldn't find them), and the export would be significantly more useful if each measurement row included the actual time.

A major issue is that any iPhone notification immediately stops measurements. Putting the phone into airplane mode helps, but it’s nearly impossible to prevent an iPhone from displaying a notification at some point. Ideally, the app should be able to continue running in the background, but I suspect that may not be possible on iOS. A workaround would be an option to manually restart a measurement and append it to an existing dataset.
 
In conclusion, the base price of the app is well worth it, but the additional spreadsheet export and long-term measurement functionality come with significant frustrations. These could easily be resolved by continuously streaming data to a file rather than relying on volatile memory storage (assuming that’s how it’s done).

### 5/5 — Very good

*2025-01-11*

I came upon this app after years of using a free, but very limited beat tracker. This app is exactly what I wanted, nicely designed, good resources, seems to work very well. Even using the built-in mic on an iPhone, or the microphone on Apple EarPods, it can track a movement very well, even with other distracting noises as there is a selectable filter. Yes it has a cost but I believe it is fair, at least so far and sometimes you have to pay for the best there is. It is certainly a good alternative to buying a much more expensive dedicated instrument.

**Developer response:** Glad you like it! Thanks!

### 1/5 — Waste of Money

*2024-04-25, version 3.0.23*

Simply doesn’t work. The free app for cuckoo clocks works better!!!!

### 1/5 — Clockmaster regulator analyzer

*2024-04-20*

The manual clearly shows a setting for external mic operation yet my version only gives me the option of internal iPhone mics. Have sent 3 messages to support for help, and they ignore me. Can only assume the app is flawed.
Don Brown/ frustrated customer

**Developer response:** Hello, we haven't received any messages from you, please contact us at apps@onyx3.com

The app works with external microphones and sensors, it requires an adapter as described in the documentation. This is explained in the documentation and clearly shown in the videos here: https://clockmasterapp.com/

### 5/5 — Great app for the Clock aficionado…

*2023-08-11*

One of my hobbies is to clean and repair old grandfather clocks. This app helps in a very simple but elegant display to set the bit, the pendulum symmetry, and other more advanced features. I highly recommended it.

### 1/5 — Will not work for 400-day clocks

*2023-05-05*

I really don’t understand why they’ve set a bottom threshold on how many beats per hour you can measure. My clocks I work on operate at 8 beats per minute. I can get it to measure correctly due to this threshold. It would be useful if I could set the BPH to 480.

**Developer response:** 400-day clocks are not supported, only rates 2400 to 18000 B/H.

Please contact us for a refund if the app is of no use to you.

### 5/5 — Great app, used it for years.

*2022-12-14*

I wouldn’t be without this app, it works really well.  It can be a fiddle getting the sensor in the optimum place but once there it works. The app can’t position the sensor for you - you have to do that yourself.  For those saying the bpm fluctuates so the app is no good, bpm can fluctuate.  That might be a slight tight spot somewhere, or simply a pendulum taking a while to “settle” or any number of reasons.  This app is simply showing you what the clock is doing - you do need to understand what the app is telling you and you need to understand horology.  Like any tool, you need to understand how to use it.

**Developer response:** Glad you like it! Completely agree.

### 5/5 — Unbelievably helpful

*2022-11-07, version 3.0.15*

I was getting my butt kicked by a wooden mechanical clock I made. I was using metronome apps, stopwatches, etc. to try and get the beat and regulation right. I'm talking weeks of time spent. Wasted. I finally found this app and it does everything it says, and does it very well. The only complaint I have, if you can call it that, is that I wish they had the beat delta info on the regulation screen. I was considering upgrading to the pro version but it's another $19.99 and it doesn't really tell you everything that is included with that upgrade.

## Frequently asked questions about ClockMaster

### What does ClockMaster do?

ClockMaster analyzes the ticking sound of mechanical pendulum clocks to determine their running rate and error. It measures the clock's speed in Beats Per Hour (B/H) and reports the deviation in Seconds Per Day (±S/D), allowing for precise regulation.

### What are the key features of ClockMaster?

The app analyzes escapement sounds to measure clock rate and error. It supports accurate long-term measurements, which is crucial for mechanical clocks that fluctuate. The Pro version offers additional features like saving and sharing branded PDF reports and exporting raw data as a .csv file for spreadsheet analysis.

### How much does ClockMaster cost?

The base version of ClockMaster is free. Additional advanced features, such as generating printable PDF reports and exporting raw data, are available through an in-app upgrade to ClockMaster Pro.

### What devices is ClockMaster compatible with?

ClockMaster is a mobile application designed for smartphones and tablets. Specific compatibility details regarding operating system versions (e.g., iOS or Android) are typically found in the app store listing.

### Who would benefit from using ClockMaster?

This app is ideal for professional clockmakers and repairers (horologists) who need to accurately regulate mechanical pendulum clocks. It is also useful for serious amateur enthusiasts who want to understand and maintain the precision of their antique or mechanical timepieces.

## Version history (last 5 releases)

### 3.0.31 — 2026-03-19

- Additions to the beat rate database.

### 3.0.30 — 2025-08-18

- Fixes a bug where the database didn't fully load on some devices. (really)

### 3.0.29 — 2025-08-18

- Fixes a bug where the database didn't fully load on some devices.

### 3.0.27 — 2025-08-17

Thanks for using ClockMaster! Please rate the app and leave a review! 

- This update brings additions to the beat rate database.
- Added support for the latest devices and resolutions.

### 3.0.25 — 2025-03-18

Thanks for using ClockMaster! Please rate the app and leave a review! 

- This update brings additions to the beat rate database.

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-30.*