iPhone Screenshots


>>> 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

What’s New

Version 3.0.1

- Setup tab shows a DELTA readout almost instantly so you don't have to wait for the whole locking process. Note that value is much more precise after the lock (once you see all the solid green dots).

Ratings and Reviews

3.8 out of 5
13 Ratings

13 Ratings

Dsa bud ,

Does work.

I use this app with a peterson tuner and by placing the clamp on the winding key find that it works very well without interruption from outside noises. As I have several clocks close by this was a problem with external mic. Would I recommend this yes in a clock beat I would, sorry! If you have trouble look at the tips within the App.

colin-n ,

This app is far superior to the previous versions

I have found the app to be very useful and very accurate pleasure to use and I hope to see much more in the future from this designer The previous build I thought was a bit clunky but this new re-vamp is absolutely fantastic it looks the part the features are more easily understood it’s a pleasure to use


Brilliant! Great app

This is a simple-to-use app which does exactly what it says on the tin. No frills, straightforward user interface and it works very well. Has all the features any clock repairer would need. The auto calibration of BPM works perfectly. I look after numerous pendulum clocks as a volunteer in a museum, and this app will enable me to regulate the clocks easily and quickly. Many thanks!


6.4 MB

Requires iOS 12.0 or later. Compatible with iPhone, iPad and iPod touch.

Age Rating
Rated 4+
© 2019 ONYX Apps
In-App Purchases
  1. ClockMaster Pro £19.99


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

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