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ChronoLog • Watch Accuracy

ChronoLog • Watch Accuracy

Accuracy and Timegrapher

189 ratings
72 reviews
🔧 Utilities
$4.99 Free
In-App Purchases

Lowest price: Free 2 years ago (-100%)

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Price history

Details

  • Released
  • Updated
  • August 8, 2023
  • July 24, 2026

Features

Developer

tyler wood
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About

This app provides professional-grade tools to track the accuracy of mechanical watches. It offers audio timegraphing, photo offset measurement, and tap timing, along with detailed analytics and atomic time synchronization for collectors and enthusiasts.

✓Audio timegrapher for rate, beat error, and amplitude
✓Photo offset measurement against atomic time
✓Tap timing for quick offset logging
✓Track accuracy trends over time
✓Atomic time synchronization
✓Detailed performance graphs and analytics
✓Manage and organize watch collection
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What's New in ChronoLog

2.5.0

July 24, 2026

What's new in 2.5.0: • Redesigned Wear Log — browse your wear history in new Calendar, Timeline, and Stats views, with a live banner for the watch on your wrist • New watch details: record production year and purchase condition • Quickly scroll through large collections with the new scrollbar • Optional ticking sound for the Clock • Refreshed Settings and Manage Data screens • Safer backups: restores are now validated, and a snapshot is saved automatically first • A refined new app icon • Plus various fixes and polish throughout the app

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In-App Purchases

$6.99

Premium

Lifetime Access to All Features

User reviews

Most RecentHighest RatedLowest Rated

Great App. Great Price.

Amazing app. Does what all the other apps do but more for so much less money. This app/tool is worth so much more than the $4 one time payment. Other apps charge a monthly fee of like $6 but do less than this and that just crazy. My favorite features are the ability to see the movement of the watch in 3D and the vibration clicks per seconds help me set the accuracy so well. 10/10 app. If you’re a watch enthusiast or even just starting the hobby I couldn’t recommend this app more.
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This app is so worth it!!This app is so worth it!!

Response from developer

Thanks for taking the time to leave a review! I'm glad you feel that it is a good value for the price. I'm very proud to deliver a premium product and experience for watch collectors without exploitative subscription pricing. It makes it harder for me because I don't have money for marketing like my competitors, but I hope word of mouth can do the job :)

Amazing & Well Designed Watch App

I tried a couple of the watch apps on the store and this one is the best. I like the layout, as it is very easy to use. Logging your watch time/accuracy is easy. The dev also just recently made some cool updates, including some graphics to show watch internals. I really like the simple clock interface as well. Some of the other watch apps are missing this key feature.
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Rossta76Rossta76

Response from developer

Thanks for using my app and taking the time to leave a review! I have fun building and maintaining this app and I’m happy you are enjoying it. If you ever have any feedback on how I can make it even better, please reach out!

Works

Great app the free version provided enough usefulness to be worthy of upgrading to the paid version.
coldsoul77coldsoul77

Useful, enjoyable, well worth the low cost

This is my favorite app of this kind. It offers many ways to measure and provides great insight into the results over time. For a single purchase I’ve benefited from every update. Thanks Tyler!
Abo PizzaAbo Pizza

Response from developer

I appreciate you leaving a review. If you ever have feedback for how I can improve Chronolog to make the best watch accuracy and timegrapher app, please let me know!

Great app

Super useful, fun to use and a great value with no subscription. I
roninboulderroninboulder
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FAQ

What does ChronoLog do?

ChronoLog is an app designed to help you track the accuracy of your mechanical watches. It provides professional-grade tools like an audio timegrapher, photo offset measurement, and tap timing to measure your watch's performance. It also allows you to log and analyze these measurements over time, offering insights into your watch's precision.

How does the audio timegrapher feature work?

The audio timegrapher uses your device's microphone to listen to the 'tick' of your mechanical watch. It then analyzes this sound to measure key metrics such as the rate (seconds per day), beat error, and amplitude. These are the same metrics professional timegraphers use to assess watch accuracy.

What is the cost of ChronoLog?

ChronoLog is a one-time purchase application. There are no subscriptions or recurring fees required. Purchasing the app unlocks all features, providing full access to its watch accuracy tracking and analysis tools.

What devices is ChronoLog compatible with?

The app description does not explicitly state compatibility requirements. However, as it utilizes a device's microphone and camera for its features, it is likely compatible with most modern smartphones and tablets running a recent version of their respective operating systems (iOS or Android).

Who would benefit from using ChronoLog?

ChronoLog is built for watch collectors, horology enthusiasts, and even watchmakers. Whether you are a seasoned collector aiming for COSC-grade accuracy, a hobbyist curious about your watch's daily rate, or a watchmaker tracking regulation results, this app provides the tools to measure, log, and understand your watch's timekeeping performance.