ChronoLog • Watch Accuracy

ChronoLog • Watch Accuracy

Track watch accuracy with ease

182 ratings
70 reviews
$4.99 Free
In-App Purchases

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


Price history


Details

  • Released
  • Updated
  • August 8, 2023
  • July 7, 2026
ChronoLog • Watch Accuracy screenshot #1 for iPhone
ChronoLog • Watch Accuracy screenshot #2 for iPhone
ChronoLog • Watch Accuracy screenshot #3 for iPhone
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ChronoLog • Watch Accuracy screenshot #5 for iPhone
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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

2.4.1

July 7, 2026

Fixing some bugs and some forms

6

In-App Purchases

$6.99

Premium

Lifetime Access to All Features

User reviews

Works

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

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!

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

Pleased

So far I’m very pleased with the app. The audio tick detector seems to be reproducible and the best part is you’re not roped in for a subscription. That I like. I’m happy to give Tyler his seven dollars one time payment for what this offers

Perfect for true enthusiasts

Fantastic app for true watch enthusiasts who like to track movement accuracy and set their watches down to the second with atomic time. It’s an app I use multiple times throughout the day and I really enjoy that the developer is still providing updates. Well worth the few bucks for the premium version. The latest update was also a big improvement Highly recommend!
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Response from developer

I appreciate you for using ChronoLog to manage your collection and measure accuracy of your mechanical watches. And I extra appreciate you taking the time to leave a review! Don’t hesitate to reach out with any feedback.

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.