# ONEOF Accuracy — Take care of your watch.

> Mechanical watch diagnostic tool with specialized sensors for performance analysis. (iPhone/iPad app by Petitpierre SA.)

- Source: https://appshunter.io/ios/app/oneof-accuracy/id978082931 (this page in markdown: same URL + `.md`)
- Developer: [Petitpierre SA](https://appshunter.io/developer/1801509697)
- Category: Productivity, Lifestyle
- Price: Free
- Rating: 1.30/5 from 4 App Store ratings · 11 written reviews indexed
- Age rating: 4+
- Requires: iOS 14.0 · 64 MB
- Languages: American English, French (France)
- Released: 2015-05-26
- Data updated: 2026-06-11
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/oneof-accuracy/id978082931/reviews.md

## What is ONEOF Accuracy?

Introducing ONEOF® Accuracy, the high-end integrated tool that provides a complete diagnosis of your mechanical watch on your Apple device. Developed by Swiss watch experts, ONEOF® Accuracy offers unparalleled precision and accuracy in identifying issues with your watch's performance.

Simply place the crown of your watch against a ONEOF® Accuracy sensor, and after a few seconds of initialization, you'll get all the detailed technical information about your watch, including rate accuracy, amplitude, beats per hour, signal analyzer, and graph. The user-friendly app lets you save all the results in your watch database, making it easy to track your watch's performance over time.

With ONEOF® Accuracy, watch aficionados can now have access to the same level of diagnostic instruments used by Swiss watch manufacturers. Whether you're a watch lover or a watchmaker, there's a device for you:

ONEOF® Accuracy²: pocket-sized acoustic measurement device for watch lovers.
ONEOF® Accuracy Boutique Edition: acoustic measurement device with an integrated demagnetizer for watch boutiques and watch lovers.
ONEOF® Accuracy Pro: manual multi-position measurement device for watchmakers.
ONEOF® Accuracy Motion: motorized multi-position measurement device for watchmakers.

Please note that for accurate results, it's important to use a dedicated ONEOF® Accuracy sensor. Simple headsets won't work, and if you decide to use a DIY sensor, the measurement duration is limited to 30 seconds.

Take your watch maintenance to the next level with ONEOF® Accuracy. Download the app now and experience the precision and accuracy that only Swiss watch experts can provide. Visit www.h2i.ch to get your ONEOF® Accuracy device today.

## Key features

- Mechanical watch diagnosis
- Detailed technical information (rate accuracy, amplitude, beats per hour)
- Signal analyzer and graph
- Save and track watch performance
- Specialized sensor required for accurate results
- Multiple device editions for different users

## Recent user reviews (10 of 11)

All indexed reviews: https://appshunter.io/ios/app/oneof-accuracy/id978082931/reviews.md

### 1/5 — Issues iOS 18

*2025-01-17*

I’m having the same issues since iOS 18 update, rendering my $1,000 device useless.

### 1/5 — APP and Device will not work if you are enrolled in the Apple Beta Program

*2024-11-12*

I have had this device for ten months. It worked well with my iPhone until I upgraded to iOS 18. The device no longer functions with my iPhone. I have to connect it to my iPad which is running iOS 17.7. Either don’t buy the device or don’t upgrade your operating system. I contacted the developer and they suggested I cal Tim Cook! Worthless

### 2/5 — OneOf  Accumotion

*2024-09-08*

The whole system, microphone and tablet seem to work fine but the
Setting and instructions are worthless. It is a very difficult system to 
Set up. Very poor instructions and their web compatibility with the microphone stated it would work with an iMac M1 chip when it did not. 
Had to call the manufacture to find out they made a mistake. This device is NOT user friendly at all.

### 1/5 — No istruction

*2024-03-21*

No way to find out how to ise this app

### 1/5 — Crappy app demo mode

*2022-08-28*

Fake app demo mode, doesn’t work, looks like you have to buy hardware for this to work. So it fakes it. So lame.

### 1/5 — Help

*2020-10-15*

Doesn’t work for me, no videos on YouTube to help explain 😒

### 1/5 — Garbage!!!!!

*2020-03-29*

Completely junk!! $600?!?!? MF!!!

**Developer response:** These are professional tools, mostly dedicated to the Swiss watchmaking industry. Please remain polite.

### 1/5 — What a rip-off!

*2019-09-26, version 2.2.0*

Just buy a real timegrapher for a small fraction of the money.

### 2/5 — You need the sensor

*2019-08-28*

I've read you can use your headphone/mic from your phone.  Sadly, this is not the case.  You can buy their sensor, but it's still cheaper to buy a real timegrapher.

### 5/5 — Played with this and it seems to work!!

*2018-11-06*

I know it says you need a special type of device, but I plugged in my headphones and used the mic and placed it behind my watch.... I Had a pretty good idea if I’m tracking it every day how fast or slow my watch runs. This app pretty much Verified the exact deviation that I was calculating myself simply by tracking it on a day today basis. I was also amazed by the magnetism detection... at first I thought “no way” but then I held one of my headphones up to the back is my phone (magnet from the speaker in it should detect a difference) and the thing went nuts!  I don’t know how useful it is for long term tracking or actual data collection, but it seems pretty accurate to me. Better than paying for another app! Give it a try!! It’s free!

## Frequently asked questions about ONEOF Accuracy

### What is ONEOF Accuracy?

ONEOF Accuracy is a high-end integrated tool designed to provide a complete diagnosis of mechanical watches using an Apple device and a dedicated sensor. It offers detailed technical information about your watch's performance.

### How does ONEOF Accuracy work?

You place the crown of your watch against a ONEOF Accuracy sensor. After a brief initialization, the app provides detailed technical data, including rate accuracy, amplitude, and beats per hour.

### What kind of technical information does ONEOF Accuracy provide?

The app offers detailed technical information such as rate accuracy, amplitude, beats per hour, a signal analyzer, and a graph to help diagnose your watch's performance.

### Can I track my watch's performance over time with ONEOF Accuracy?

Yes, the user-friendly app allows you to save all diagnostic results into your watch database, making it easy to monitor and track your watch's performance history.

### Do I need a special sensor to use ONEOF Accuracy?

Yes, for accurate results, it is important to use a dedicated ONEOF Accuracy sensor. Simple headsets will not work, and DIY sensors have a limited measurement duration of 30 seconds.

### What are the different editions of ONEOF Accuracy available?

There are several editions: ONEOF Accuracy² for watch lovers, ONEOF Accuracy Boutique Edition with a demagnetizer, ONEOF Accuracy Pro for watchmakers, and ONEOF Accuracy Motion, a motorized device for watchmakers.

### Is ONEOF Accuracy available on Android devices?

Based on the provided data, ONEOF Accuracy is designed for Apple devices, including iPhone, iPad, and iPod.

### How often is ONEOF Accuracy updated?

The app was last updated on March 11, 2025, with version 4.2. This indicates a history of updates, suggesting ongoing development and support.

## Version history (last 5 releases)

### 4.2 — 2025-03-11

iOS 18 compatibility

### 4.1 — 2023-04-26

Improve calibration process for the ONEOF® Accuracy 1st generation.
Fix a bug that was causing issues with certain actions in the test sequence.

### 4.0 — 2023-04-01

This major release of ONEOF® Accuracy brings all the pro features used by Swiss watch manufacturers to iOS, including:
 - Compatibly with the Accuracy Motion
 - Full multi-position capabilities management
 - Parameters set database
 - Programmable sequence toolkit
 - Detailed measurement criteria

With these new features, watch aficionados can now have access to the same level of precision and accuracy in watch diagnosis as the Swiss watch industry. Upgrade to the latest version of ONEOF® Accuracy to experience these powerful new tools and take your watch maintenance to the next level.

### 3.0 — 2019-10-11

Full compatibility with iOS13 & iPad Pro.
Brand new active noise cancelling algorithm.
Compatible with OMEGA co-axial escapement (note: lift angle = 37°)
New algorithms for amplitude detection, more reliable with vintage watches & tourbillons.

### 2.2.0 — 2019-05-15

Full compatibility with the new Accuracy Pro.
New algorithms for better / faster frequency and amplitude detection.
Minor bugs fixed.

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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 2026-06-11.*