# ClockSpeed — find accuracy of your watch

> Analyze watch and clock ticking sounds for precision and accuracy. (iPhone/iPad app by Thomas Lehmann.)

- Source: https://appshunter.io/ios/app/clockspeed/id6472756415 (this page in markdown: same URL + `.md`)
- Developer: [Thomas Lehmann](https://appshunter.io/developer/1606822314)
- Category: Lifestyle
- Price: Free with in-app purchases
- Rating: 2.00/5 from 1 App Store ratings · 3 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.4 · 1 MB
- Languages: English, German
- Released: 2023-11-27
- Data updated: 2026-06-10
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/clockspeed/id6472756415/reviews.md

## What is ClockSpeed?

Overview ClockSpeed
The App ClockSpeed records the ticking of your watch or clock, and analyses the sound to find the precision and accuracy of it.
Note: You need to know the clock you are measuring, you need to know how it is designed and how fast it is built to run. The App compares the reality with what you choose in the settings - the result is the difference between the reality and the intended theory. The App knows only how fast the clock ticks, not how fast it should tick - you need to select this setting for an accurate result.
 
The sound is recorded lossless with a sampling rate of 192kHz, which gives it a precision of about a ½ second deviation per day, with a recording of just about 1 minute.
You can import the sound recorded with another tool, e.g. the Apple Voice Memos App, which can record maximal with 48kHz, which reduces the accuracy of the App result to a deviation of about 2s per day.
 
The App works with some assumptions:
1) The loudest noise on your recording needs to be the ticking. Side noises are OK as long they are quieter. Passing cars or chirping birds can be very loud, so do not expect a good result with a poor recording. Some single short noise peak can be filtered out by the App.
2) Listen to your recording – can you hear the ticking? If not, the result might be inaccurate. Watch the provided picture of the sound, you usually can see side noises and disturbances.
3) You know how fast the clock should be, and how many ticks are expected per second. Imagine a pendulum clock, which ticks once per second, and your wrist watch ticks maybe 8 times a second. You need to select the correct speed in settings, a wrong choice leads to a wrong result.
4) Each tick sounds identical, but in reality, they are not identical, therefore the measure is not perfect, but still very good. Do not try to verify the App with a ticking quartz clock, because that type of clocks has big differences in the single ticks. The balance wheel of a mechanical watch creates much more constant noises as a quartz clock with its plastic gears. Anyway, expect small variations of the result with different recordings, even if you do them just one after the other.

## Key features

- Records and analyzes watch ticking sounds
- Calculates precision and accuracy
- Compares recorded sound to user-defined tick rates
- Supports lossless 192kHz audio recording
- Allows importing recordings from other apps
- Provides deviation per day estimate

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| ClockSpeed | $3.99 | one-time |


## Recent user reviews (3 of 3)

All indexed reviews: https://appshunter.io/ios/app/clockspeed/id6472756415/reviews.md

### 1/5 — Basically worthless

*2025-11-06*

I agree with the other review. You can’t change ANY of the options in settings unless you go for the full version. I couldn’t even give the app a test run because I wanted to test a pendulum clock not a watch.

### 2/5 — Free version is worthless

*2024-05-21*

You run a test on a watch, and the results are effectively, “We have the results but you have to pay us to see them”.

### 2/5 — Needs more settings?

*2024-04-12*

Just tried this app to help me calibrate pendulum clocks. The user needs to input the number of ticks per second from a drop down menu, but gauging what this is isn’t easy. Also at one end of the available scale the slowest tick is at one second intervals (correct for a long case or grandfather clock), but the next options are 1.33 ticks per second then 2 ticks per second with nothing in between. I have a clock with a pendulum of about 6” and used the 1:33 option but it is impossible to say whether 1:33 is accurate and clearly the options 1 and 2 would be wrong. Some further help from the developer would be useful. I may then be able to improve my rating.

I see that Thomas has kindly responded to my review, which I appreciate, but his reply has confirmed my conclusion that the app will not help me to determine whether my collection of old pendulum clocks are keeping good time. It isn’t easy to determine what the designed interval between the tick and the tock should be on such clocks and this knowledge is essential for the app to work. 

For it to do what I want it would be helpful  if it were possible to input the length of the pendulum (from the suspension to the centre of gravity of the pendulum bob, I would imagine) as it is this which determines the time interval between the tick and the tock. The longer the pendulum the longer the interval.  Sadly there seems no way of opening a one-to-one dialogue with Thomas about this.

**Developer response:** hi there
the app measures the actual duration between the ticks. And the value you need to choose is in principle the duration you expect between the ticks, the exact timing the manufacturer had in mind when the clock was designed. The result is the difference between the two values.
Let me give you an example: Let’s say, the app finds that your clock ticks exactly twice per second. But without your input the app does not know, how fast/slow it is designed to tick. How should it calculate if it runs fast or slow? If you tell the app you expect only one tick per second, your clock runs actually double speed. If you tell the app, you expect 4 ticks per second, it runs actually half speed. Clear?  
I designed the pull down menu based on many clocks I measured. If you have anything, which is not covered, I am happy to adjust it.
Especially with old pendulum clocks, you really need to understand your specific clock how fast it is designed to tick, otherwise you will never find out if it is fast or slow with just a few ticks. In such a case I suggest you measure the old fashioned way over 24h the accuracy of your clock and share the result how many seconds/minutes it was fast/slow and a 60 second recording of your clock with me, then I can add such a special case into the pulldown menu.
Your case with a 6“ pendulum is maybe a clock with 4500vph or 1.25Hz, which I personally never have seen. Just in case, I will add this value for you in the next two weeks, I hope you will find it useful.

## Frequently asked questions about ClockSpeed

### What is ClockSpeed?

ClockSpeed is a lifestyle app that analyzes the ticking sound of your watch or clock to determine its precision and accuracy. It helps you understand how closely your timepiece adheres to its intended timekeeping.

### How accurate is ClockSpeed?

With a 192kHz lossless recording of about 1 minute, the app offers a precision of approximately ½ second deviation per day. Importing recordings made at 48kHz may reduce accuracy to about 2s deviation per day.

### What are the requirements for using ClockSpeed?

You need to know how your clock is designed to run and its intended speed. The loudest noise in your recording must be the ticking sound, and you must be able to hear the ticking clearly.

### Can I use ClockSpeed with any clock?

The app works best with mechanical watches, as their balance wheels create more constant noises than quartz clocks. Avoid using it with quartz clocks for verification due to their significant variations in single ticks.

### Does ClockSpeed have ads?

No, ClockSpeed does not contain advertisements. It is a free application that focuses on providing its core functionality without interruptions.

### What devices is ClockSpeed available on?

ClockSpeed is available for iPhone, iPad, and iPod. It is designed to run on Apple's mobile operating system.

### How often is ClockSpeed updated?

The latest version of ClockSpeed is 1.1.1, which was last updated on April 20, 2024. Updates typically include bug fixes and performance improvements.

### What is the age rating for ClockSpeed?

ClockSpeed has an age rating of 4+, making it suitable for a wide range of users. This rating indicates it contains no mature content.

## Version history (last 3 releases)

### 1.1.1 — 2024-04-20

no functional change, minor update in help text

### 1.1 — 2024-04-18

New selection method for the clock speed for pendulum clocks via pendulum length in inch or meter.
Improved explanation what speed to choose and why.

### 1.0 — 2023-11-27

No release notes.

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## More apps by Thomas Lehmann

- [KohaOS](https://appshunter.io/ios/app/kohaos/id6467831983)
- [PolePointer](https://appshunter.io/ios/app/polepointer/id6468378529)

All apps by Thomas Lehmann: https://appshunter.io/developer/1606822314

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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 2026-06-10.*