ChronoLog Watch Accuracy Meter

tyler wood

In-app purchases

About this app

Measure Watch Accuracy with Atomic Precision
ChronoLog is the ultimate watch accuracy tester and timegrapher app for enthusiasts, watchmakers, and collectors. Using advanced atomic clock synchronization, ChronoLog lets you measure your mechanical watch or quartz timepiece with microsecond accuracy. Whether you’re regulating a vintage chronometer or tracking your daily wearer, ChronoLog delivers professional-grade watch timing tools in an intuitive, ad-free experience.

Two Precision Measurement Modes
• Quick-Tap Watch Accuracy Check – Record your watch time instantly against an atomic reference.
• Photo-Measurement Watch Accuracy Check – Capture your dial, analyze the offset, and calculate daily rate variation.

Full Watch Collection Management
• Add unlimited watches with photos, brand, model, movement, and serial number.
• Tag and organize your timepieces for easy reference.
• Track historical accuracy and performance trends over time.

Advanced Analysis & Tools
• Microsecond-accurate watch timing via atomic NTP sync.
• Graphs and charts showing drift, offset, and daily rate changes.
• Export your accuracy logs to CSV for deeper analysis.

Why Choose ChronoLog?
Unlike other timegrapher apps, ChronoLog combines precision measurement with powerful watch collection tracking — all in a clean, ad-free interface. It’s built for serious collectors, professional watchmakers, and anyone who values true watch accuracy.

Stay on Time — Always
Download ChronoLog today and take control of your watch accuracy. Whether you’re fine-tuning a movement or simply tracking performance, ChronoLog gives you the professional tools to keep every watch running at its best.

Ratings and reviews

It feels nice and premium, but missing some information. I cannot pull up previous logs with more detailed information to determine tuning over time.

Pretty good for free app that look and feel very professional. It does allow like 1 watch with 3 logs. Continue testing if like for sure to buy the pro unlocked version.

really nice app, the dev has done some great things with it in the past few months. a fantastic bargain for all the functionality this offers, and hugely appreciate that this is available on Android.

What’s new

More coaching in the audio flow. Some deeper telemetry to analyze. New app icon