Twelve O'clock vs ChronoLog • Watch Accuracy Usage & Stats
Twelve O’clock is an app that helps track your watch accuracy easily in a realistic way.
I can’t stress this enough: it’s “tracking”, not measuring instantaneous accuracy like a timegrapher device.
It’s a manual and oldschool job but it brings so much fun. It reminds me of the old days when I had to synchronize my watch to the clock on the TV at 7pm every day.
With Twelve O'clock you can:
** MANAGE YOUR WATCH COLLECTION
* Add, edit, remove any item in a list of your watch collection
* Include a nice wristshot of each watch
** KNOW YOUR WATCH ACCURACY
* Simply add some checkpoints and let the app calculate the accuracy in *second per day*
* A nice chart of the accuracy over the time
** LEARN MORE ABOUT HOROLOGY
* Curated content for watch lovers (like me)
- Apple App Store
- Free
- Utilities
Store Rank
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ChronoLog: The Ultimate Precision Timekeeping & Mechanical Watch Tracking App
Discover ChronoLog — the best timepiece accuracy measurement tool for watch collectors, horology enthusiasts, and mechanical watch aficionados. ChronoLog delivers unparalleled watch measurement, performance tracking, and detailed watch analytics.
Key Features:
• Effortless Watch Measurement: Quickly add your mechanical watches and vintage timepieces with a simple tap or photo. ChronoLog precisely calculates offsets against true time, ensuring your watch’s daily rate, chronograph performance, and timekeeping accuracy meet the highest COSC and METAS standards.
• Detailed Performance Analytics: Dive into in-depth watch analytics with our easy-to-read data visualizations. Monitor accuracy, daily rate changes, and performance trends to optimize your watch maintenance and appraisal. Whether it’s for a prized mechanical watch or a collectible timepiece, our analytics help you understand every tick and tock.
• Stunning Visualizations: Transform raw data into attractive graphs and charts that reveal detailed insights into your watch’s precision, chronometer performance, and overall timekeeping. With ChronoLog, uncover trends that inform your watch care and highlight the beauty of mechanical watch measurement.
• Custom Tags & Data Management: Tag every measurement with conditions like “overnight,” “after winding,” or “daily wear” to analyze how different factors affect your watch performance. Effortlessly export all your watch data and measurements to CSV for further review or to share with your trusted watchmaker.
ChronoLog isn’t just another app—it’s your dedicated watchkeeping assistant, perfect for those who demand accuracy, precision timekeeping, and exceptional mechanical watch performance. Embrace the art of horology with ChronoLog, where cutting-edge technology meets timeless craftsmanship.
Download ChronoLog today and elevate your watch collection with the ultimate tool in watch measurement, timepiece tracking, and mechanical watch analytics.
- Apple App Store
- Free
- Utilities
Store Rank
- -
Twelve O'clock VS. 
ChronoLog • Watch AccuracyJanuary 18, 2026