About Chronometer
This APP helps you track the accuracy of your chronometer watch It is very easy to track the accuracy of the day rate of your watch Before you start set your clock to atomic time. Do not set the clock during the recording...
This APP helps you track the accuracy of your chronometer watch It is very easy to track the accuracy of the day rate of your watch Before you start set your clock to atomic time. Do not set the clock during the recording process! The Chronometer APP requires an internet connection to get the accurate NTP time. 1. Start the APP and wait until the NTP server gets the accurate time (about 5 seconds, green NTP time). 2. Take a picture of your watch dial in the APP (freeze video feed). 3. The APP suggests the tracking time from the NTP server when you took the picture 4. Read the time exactly on your frozen picture and correct the time with the picker wheel 5. Ideally you can enter the altitude in meters for the current tracking 6. Save the time with the Save Rate button. Record the accuracy from your watch every day at the same time if possible. The APP compares your daily clock time difference with the NTP server. You can check how accurate your clock is and adjust the rate if necessary. Wait until you have 15 days of data before assessing the accuracy of your watch. The original chronometer certification of your clock was also created in 15 days. A mechanical wrist watch with less than 10 seconds deviation per day is very accurate. You can save the statistics data in Excel CSV format to your iCloud for further analysis. In the CSV file you have 4 columns. Date / absolute rate difference / daily rate difference / altitude above sea level Swiss NTP metas server ntp11.metas.ch COSC NTP 4Hz reference dial for calibration of optical measuring instruments This APP is optimized for iOS 16
Version History iOS 18 optimized Small bug fixes 1.8 10/12/2024 Bug fixes for iOS 16 Bug fix for save rate 1.7 09/24/2023 Save Rate bug fixed 1.6 10/14/2022 COSC NTP reference dial for calibration of optical measuring instruments up to 2.5Hz iPad camera view bounds fixed iOS 16 1.5 09/27/2022 Bug fixes Intelligent date management if you miss to capture the rate 1.4 04/22/2022 iOS 15 support Average, standard deviation and rate resumption are now integrated The APP controls continuous date registration and smooth the result if din't save the rate every day 1.3 02/03/2022 Bug fix for camera view 1.2 04/19/2021 SWISS METAS NTP Server 1.1 04/14/2021 1.0 04/10/2021
Previous Versions
Here you can find the changelog of Chronometer since it was posted on our website on 2023-09-06 18:26:51.
The latest version is 1.8 and it was updated on 2026-06-24 09:57:02. See below the changes in each version.
Chronometer version 1.8
Updated At: 2026-06-03
Changes: Version History iOS 18 optimized
Small bug fixes 1.8 10/12/2024 Bug fixes for iOS 16
Bug fix for save rate 1.7 09/24/2023 Save Rate bug fixed 1.6 10/14/2022 COSC NTP reference dial for calibration of optical measuring instruments up to 2.5Hz
iPad camera view bounds fixed
iOS 16 1.5 09/27/2022 Bug fixes
Intelligent date management if you miss to capture the rate 1.4 04/22/2022 iOS 15 support
Average, standard deviation and rate resumption are now integrated
The APP controls continuous date registration and smooth the result if din't save the rate every day 1.3 02/03/2022 Bug fix for camera view 1.2 04/19/2021 SWISS METAS NTP Server 1.1 04/14/2021 1.0 04/10/2021
Chronometer version 1.8
Updated At: 2024-10-12
Changes: Oct 12, 2024
Version 1.8
iOS 18 optimized
Small bug fixes
Chronometer version 1.8
Updated At: 2024-10-12
Changes: iOS 18 optimized
Small bug fixes
Chronometer version 1.7
Updated At: 2023-09-24
Changes: Sep 24, 2023
Version 1.7
Bug fixes for iOS 16
Bug fix for save rate
Chronometer version 1.6
Updated At: 2022-10-14
Changes: Oct 14, 2022
Version 1.6
Save Rate bug fixed
Disclaimer
Official App Store Link
We do not host Chronometer on our servers. We did not scan it for viruses, adware, spyware or other type of malware. This app is hosted by Apple and passed their terms and conditions to be listed there. We recommend caution when installing it.
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