ONEOF Accuracy4.2 - App Store

Introducing ONEOF(R) 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(R) Accuracy offers unparalleled precision and accuracy in identifying issues with your watch's performance.

Simply place the crown of your watch against a ONEOF(R) 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(R) 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(R) Accuracy²: pocket-sized acoustic measurement device for watch lovers.
ONEOF(R) Accuracy Boutique Edition: acoustic measurement device with an integrated demagnetizer for watch boutiques and watch lovers.
ONEOF(R) Accuracy Pro: manual multi-position measurement device for watchmakers.
ONEOF(R) Accuracy Motion: motorized multi-position measurement device for watchmakers.

Please note that for accurate results, it's important to use a dedicated ONEOF(R) 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(R) 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(R) Accuracy device today.

Version History iOS 18 compatibility 4.2 03/11/2025 Improve calibration process for the ONEOF® Accuracy 1st generation.
Fix a bug that was causing issues with certain actions in the test sequence. 4.1 04/26/2023 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. 4.0 04/01/2023 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. 3.0 10/11/2019 Full compatibility with the new Accuracy Pro.
New algorithms for better / faster frequency and amplitude detection.
Minor bugs fixed. 2.2.0 05/15/2019 Improved detection of the Zenith El Primero movement 2.1.2 03/27/2018 Fixed minor display bugs
Fixed looped demagnetization bug (Accuracy boutique edition) 2.1.1 03/20/2018 Great improvements on the ONEOF Accuracy app:
- New Demo mode
- Change measurement settings from the main Accuracy view
- Double tap on the frequency to display the "beats per hour" unit
- New AGC (Automatic Gain Control) algorithm
- iOS11 & iPhone X compatibility 2.1 03/09/2018 Minor improvements. 2.0.2 04/26/2017 Minor bugs fixed. 2.0.1 02/09/2017 - The new Accuracy App 2.0 automatically detects the presence of your watch on the sensor.
- The new Magnetization page uses the integrated magnetic fields sensor of your device. Scan your watch with your iPhone/iPad to check if your movement suffers from magnetization. 2.0 12/31/2016 Compatibility with iOS 9.3.1 1.1.1 04/16/2016 Dear ONEOF accuracy users,
We have received great feedback on our amazing product, some of them coming from major Swiss brands !
Today, the 1.1 version of the Accuracy app brings great technical and aesthetic improvements, while keeping its unmatched ease-of-use :
- New adaptive signal detection algorithm
- New quality signal indicator
- New "vibrograph" display
- Amplitude and beat error data storage
- Compatibility with iPad Air & iPad mini, portrait & landscape mode
- Compatibility with iOS9 1.1.0 11/06/2015 1.0.0 05/19/2015