Clock Tuner APK

Rating: 5+ votes, 3.6/5

A TimegrapherThis app is to measure the BPH(Beats per hour) of mechanical watches.It will display time error per day as...[read more]

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2.8 MB

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File Infos

Size‎2.8 MB
File Namecom.athumbsoft.pendulumtuner-v2.63.apk
Requires Android VersionAndroid 4.4+ (KitKat)
RecommendedAndroid 7.1 (Nougat)
Package Namecom.athumbsoft.pendulumtuner
Author's NotesMeasure beat rate of mechanical watches.

Certificate fingerprints (Signature):

SHA-1: 46AF24FB382C8DB7911AF18430A6B6F0D5725CC7
SHA-256: AD4C2366AB9976AED4835437972DE358371E2B3B2867B765A05A00EAEBD8B28D
The cryptographic signature guarantees the file is safe to install and was not tampered with in any way.

File hashes:

MD5: 6AB3F98D586D709918E91ADEBF051F2E
SHA-1: D64FDC0C22AFB935524D11FD26860737EA24E134
SHA-256: FE521300728E9FA863687500FD712831F0A86CC867CFAE261CCD8C6DED3685E8
Verify the file you downloaded is not corrupt and was not tampered with using the file hashes above.

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Screenshots (3 pics)

Screenshot 01Screenshot 02Screenshot 03

About Clock Tuner APK

Clock Tuner APK Download for Android
Clock Tuner APK Download for Android

Latest updates

What's new in version 2.63

Minor bug fix.
You can try full function within 30min.


A Timegrapher

This app is to measure the BPH(Beats per hour) of mechanical watches.
It will display time error per day as well.

The app uses microphone to measure BPH.

** Recommend to plug a microphone into phone and attach the microphone to the back of your watch.
** Basic version display wave graph and pulse interval histogram.
** Frequency display requires 'Premium' upgrade.

** Please test the app with your watch before you purchase 'Premium' upgrade. The app will work as Premium during 30 min.

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

- 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

User's Reivew

5 ★ Regulated my watch in 5 min. Well worth $5. Yes it gives you a trial period then you have to pay. They made an awesome app, let them profit. You would pay alot more for professional equipment that do the same thing. $100+ easily. If you have an automatic watch get this app. Use your head phone mic, put it on the back of your watch and regulate!by B Hun on November 30, 2017
5 ★ Simple, easy to use, almost self explanatory. Others are far too complex and difficult. This one did the job without any tutorials or having to watch videos. Worth the pro upgrade. Worked on all my watches using the phone's microphone. I didn't have to attach an external Richard Friedman on January 11, 2018
1 ★ Good app, but you can only use it once. After that you need to buy the app. I wonder why this is not mentioned before the installation... Shame on you AThumb Inc! Anonymous on June 19, 2017
4 ★ Had an issue originally, can only run once before having to pay. Seems to to a good job, would like to see delta on beat offset. My clock has auto beat setting, but curious. Garry Anderson on August 21, 2017
2 ★ You can't use it to correctly measure or tune a watch...! It gives very random measures and it's way far behind from any other watch tools I'm using. Lack of precision and randomly results. For a paid version it's quite a shame...!by Onut SPARCHEZ on December 08, 2017
1 ★ If it can only be used once for free, then it is useless. Pity 'cause otherwise not Anonymous on October 21, 2017
4 ★ So far the only beat monitor that has worked with phone mike. Woud be nice to include drift in free. Even after running once still detects and James W. Delphenich on November 18, 2017
4 ★ Very good. Works well on a mechanical watch and pendulum clocks. One suggestion- Could it be tweaked so that it can measure beat of 400 day clocks which run at 8 or 10 BPM. It is able to pick up the sound of my torsion clock but it does not come up with a frequency - maybe a longer sample time would do this? It looks like the top graph labelled 'beat monitor' enables one to make sure both pendulum beats are equal. two parallel lines suggest the clock is out of beat. Looks like the idea is to adjust the clock until there is just a single line ... Neat. Thank youby Anonymous on July 10, 2017
5 ★ showed the slight error of my new Chinese pocket watch. surprisingly good product from you sir (and the Chinese watchmaker!)by Ed Kempe on June 19, 2017
5 ★ Awesome if your not a moron. It's not perfect but once want argue with the price!by Anonymous on July 27, 2017

How to install Clock Tuner APK on Android phone or tablet?

Download Clock Tuner APK file from, then follow these steps:

Update Phone Settings

  • Go to your phone Settings page
  • Tap Security or Applications (varies with device)
  • Check the Unknown Sources box
  • Confirm with OK

Go to Downloads

  • Open Downloads on your device by going to My Files or Files
  • Tap the APK file you downloaded (com.athumbsoft.pendulumtuner-v2.63.apk)
  • Tap Install when prompted, the APK file you downloaded will be installed on your device.

See more (full steps with pictures)

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