Chronographer
Track your mechanical watches
Free · Designed for iPad
Chronographer helps you track the long-term accuracy of your mechanical watches.
Use Chronographer to periodically collect data points comparing a watch’s time to the current correct time. Chronographer stores this information and uses it to create charts that help you visualize your watches’ performance over time. It also calculates detailed metrics about each watch’s overall accuracy. Chronographer tracks offsets (the difference from the correct time) and deviation (how many seconds a watch gains or loses per day). Graphs show individual data points and best-fit trend lines over timespans ranging from a week to a year. Histograms provide insight into how various offset and deviation values are distributed.
Chronographer calculates the following metrics:
• Average Offset
• Max. Positive Offset
• Max. Negative Offset
• Last Offset
• Net Gain/Loss
• Best-Fit Deviation
• Average Deviation
• Fastest Deviation
• Slowest Deviation
• Last Deviation
• Deviation Variance
• Best-Fit Deviation Drift
Chronographer can store information about your whole watch collection. Give each watch a name and, optionally, a longer description. You can select a picture from your Photos library and add additional notes, such as the watch’s specifications, purchase details, and service history. All information can be stored in iCloud and automatically synchronized between your devices.
You can use Chronographer to track positional variation. Whenever you record a data point, you can include the position (dial up, crown up, etc.) that the watch was stored in. Then, you can restrict the charts and metrics to specific positions and compare the results.
For best results, collect a data point for each of your watches every day or two.
Chronographer includes a large digital clock to help when you set your watches.
You can export your watch data to local storage or to iCloud Drive. This is useful for backups and to share your data.
For more information, including a detailed user’s guide, see https://www.rmfrance.net/chronographer
Ratings & Reviews
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• Replaced the data point list’s Sort Order button with a menu.
• Added the app version number and a link to the Chronographer web page to the clock.
• Improved the alignment between user interface elements and system controls.
The developer, Robert France, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Robert France
- Size
- 2.6 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.6 or later.
- iPhone
Requires iOS 17.6 or later. - iPad
Requires iPadOS 17.6 or later. - Mac
Requires macOS 14.6 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.3 or later.
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2025 Robert M. France