Cuckoo Clock Calibration

• Price: $0.99

Last verified 31 Jul 2026

4.9 36 ratings · App Store

1. 5/5Feature Request

   This app is wonderful! I just upgraded my Grandfather Clock with a new Hermle movement and was not looking forward to spending a week or more calibrating the pendulum. Within a few hours I got this baby down to gain or lose just seconds per day. This tool will be a tremendous time saver to keep my clock running at it’s finest. The biggest problem was getting a good run - the iPhone microphone picks up so much background noise that it is difficult to complete a calibration pass. I had to wait until everyone was in bed before I could get good, reliable readings. Just the dog’s nails clicking on the hardwood floor was enough to trigger an upset. My suggestion (Feature Request) is, once you’ve reached a high level of confidence in the beats measurement, put guard bands around the measured beats. That way, any noise outside the guard bands would be rejected.

   Tangata.Manu · 31 Jul 2026

2. 5/5Not only cuckoo clocks!

   I used this app to successfully measure the rate of a 1944 Hamilton Model 21 marine chronometer. These timepieces were used for navigation of large ships of the US Navy during WWII and they are arguably the most accurate portable mechanical timepieces ever made. The app works well to measure the period of the clock. In fact, it works much better than my other software that is better suited to wristwatches. I suspect this is because the wristwatch timing software looks for an acoustic profile of a wristwatch lever escapement, and gets confused with the detent escapement of the Model 21. The app recently improved its resolution to 1 us, which makes it ideal to measure the Hamilton. The period of the Hamilton is 500 ms, so the improved resolution permits an adjustment of rate to within 0.17 s/day. Thanks Nir.

   Deafboy1967 · 31 Jul 2026

3. 5/5Works well. Could use features.

   This works well for what it is. Its accurate and informative making clock tuning much easier. It would be great to have broader clock options. I used this for a one to one grandfather clock, which it’s pretty easy to see it going at 60bpm but the app won’t let you use this as a reference. I also have a mini clock that ticks rather quickly, so there’s no reference for this. It would be awesome for the community on the app to be able to share references with everyone when they get certain clock types tuned just right. Maybe showing the brand if known, the size, and maybe even an image of the clock.

   oekukala · 31 Jul 2026

4. 5/5Not Just For Cuckoo Clocks

   Works great, with all the accuracy and sensitivity an OCD person could hope for. This app will easily reduce the need to tinker with your clock to a tenth of what is needed by trial and error, which might be a negative for some. Suggested improvements - more user-input references would be a huge improvement for those of us with a house full of different types of clocks (none of which, in my case, are cuckoos). Different clock images for each of the user set references would be a good stylistic change. I’m glad I found this app in spite of the name.

   sayethTheDude · 31 Jul 2026

5. 5/5Just what I was looking for

   This app is nearly perfect. It is sensitive and allows you to set the gain and detection threshold to overcome room noise. Only 2 things that would improve it: 1) Plot the period over a few minutes to see the stability of the escapement 2) Allow reference periods over 1 second, my buco clock has a target period (half swing) of 1125 milliseconds, and a full return to start period of 2250 ms, with 25 pins on the escapement wheel.

   Newnickname64478 · 31 Jul 2026

Privacy

• No Details Provided Developer declared

Accessibility

No accessibility labels collected yet.