Clock Tuner

Clock Tuner


(3 stars)


Download for Android Like

10,000 - 50,000 downloads

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View bigger - Clock Tuner for Android screenshot
View bigger - Clock Tuner for Android screenshot
View bigger - Clock Tuner for Android screenshot
A Timegrapher

Adjust your mechanical clock by your self.
Just run this app on your phone and put your phone near your cuckoo clock or grandfather clock.

This tuner samples and analyze clock sound to displays the frequency of pendulum in real time.
You can easily measure clock frequency to adjust pendulum.

My Galaxy Nexus detects the pulse of Rolex Datejust in calm environment.

Not for digital clocks.
Not working in noisy environment.
Set microphone direction toward a clock.

** Basic version display wave graph and pulse interval histogram.
** Frequency display requires 'Premium' upgrade.
** Do not upgrade if the 'Basic' version fail to display pulse interval histogram.

- Review from Mr. Kojima,42142.0.html

- Preset example
Rolex or mechanical watch: Target frequency: 4 or 5Hz, Sample duration: 2Sec, Sensitivity: manual 50
Most pendulum clock: Target frequency: 1 or 2 Hz, Sample duration: 5 or 10 Sec, Sensitivity: medium

1) in the settings there is a sensitivity option with a high, medium, low and 3 manual settings, can you explain how this changes the results

It determines sound amplitude threshold for detecting clock sound. If your clock sound is loud you may reduce sensitivity. This will allow more environmental noises.
If you increase the sensitive, you may measure hand watches. But small noise may measurement errors.

2) why does the detected frequency change between light grey, black and red
Red means smaller drift during the measurement interval while grey means that measurement may have an error.

3) the average frequency does not always calculate, it stays at NaN
The 'detected frequency' should be red continuously.

4) how do you calculate the pulse drift %
abs(max detected frequency - min detected frequency) / detected frequency during 1 detection cycle.

5) what are the 2 graphs showing and what data are you using for the calculations
The size of bars in the upper graph should be almost the same.
The bottom shows amplitude of sound wave recorded from micro phone.

6) are newer versions of the app being developed

** You may provide sound sample by sending wav or mp3 file to

Tags: clock tuner, timegrapher apps, timegrapher mechanical, reloj pendulo, mesurer fréquence pendule, clock tuning, fondo de pantalla reloj pendulo, clock tuner premium upgrade, timegrapher, clock tuner mechanical.

Recently changed in this version

v 2.05
- Keep ProMode without data connection.
- Improved sound filter.
- Half beat rate problem is fixed.
- Improved accuracy

Comments and ratings for Clock Tuner
  • (51 stars)

    by Utkarsh rajput on 24/11/2014

    No one can get better tuning utility then this helped a lot to fix speed of my automatic mechanical watch.

  • (51 stars)

    by Dave Epperson on 16/11/2014

    ...I have a Hermle grandfather movement before me that runs @ 66 bpm (3960 bph). The app does not seem to recognize that rate to sync and calculate against

  • (51 stars)

    by jeramy cleghorn on 11/11/2014

    Work in progress but still has bugs. Works great when it works.

  • (51 stars)

    by Sam NARRAINEN on 06/11/2014

    Actually it works after rebooting the phone ! It was showing smth like 300bph when it has to be 28800, but after rebooting, it started to show around 28790 ! (Also I found the right angle for recording...) Amazing how did you managed to build such a brilliant app ! I am sorry I have sent you email for refund. Such app has to cost 3 times more !  Can you add some features like saving the tests and

  • (51 stars)

    by Natavar Thakor on 28/08/2014


  • (51 stars)

    by Patrick Templeton on 03/07/2014

    Had to remove battery to recover system after I changed sample time to 10 sec. App seems to work otherwise but is kind of useless without premium version.

  • (51 stars)

    by Mark Ruyle on 19/04/2014

    Had trouble updating to pro. Some glitches but works well once I deleted rebooted and installed the pro on my tablet. Does what it says and the graphics are great. Has good pick up without a dedicated mic. Gives beat error and BPH or BPM. Does what it says. Works with watches and clocks. Despite some glitches it is worth what I paid. The graphics are what really make it good. Really well done.

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