ChronoLog • Watch Accuracy

Name: ChronoLog • Watch Accuracy
Rating: 4.7 (122 reviews)
Author: tyler wood

Track watch accuracy with ease

Free · In‑App Purchases

122 Ratings
Ages

4+
Years
Category

Utilities
Developer

tyler wood
Language

EN
English
Size

47
MB

Measure watch accuracy like a pro. Audio timegrapher, photo & tap offset logging, and atomic time sync — all in one app. Free Trial! No subscription, no account required. ChronoLog — Watch Accuracy Tracker & Audio Timegrapher for Mechanical Watches Track the accuracy of your mechanical watches with professional-grade tools. ChronoLog combines an audio timegrapher, offset measurement logging, and atomic time synchronization into one app — purpose-built for watch collectors and horology enthusiasts who care about precision. No subscription. No account. One-time purchase unlocks everything. MEASURE WATCH ACCURACY — THREE WAYS • Audio Timegrapher: Use your device's microphone to listen to your watch's tick and measure rate (seconds per day), beat error, and amplitude — the same metrics a professional timegrapher provides. • Photo Offset: Photograph your watch dial against atomic time, enter the displayed time, and ChronoLog calculates the exact offset. The most precise manual method for measuring watch accuracy. • Tap Timing: Tap when your watch hits a specific second to quickly log an offset. Fast, simple, and works with any watch. TRACK ACCURACY OVER TIME Each measurement is logged to a timing run — a series of readings that ChronoLog analyzes together. Monitor your watch's daily rate, see how accuracy changes day to day, and spot regulation issues before they become problems. Tag measurements with conditions like position, temperature, or wear pattern to understand what affects your watch's performance. ATOMIC TIME SYNCHRONIZATION ChronoLog syncs with NTP atomic time servers so every measurement is referenced against true time — not your phone's clock. View the live atomic time, compare it to your device, and use it as a precision reference when setting your watches. DETAILED ANALYTICS & VISUALIZATIONS Dive into performance graphs that show rate trends, offset history, and accuracy patterns across your entire collection. See at a glance which watches in your collection are your most accurate daily wearers and which need regulation or service. BUILT FOR WATCH COLLECTORS • Add unlimited watches with photos, brand, model, serial number, caliber, and notes • Organize your collection with archive support • Export all measurement data to CSV for your records or your watchmaker • Back up and restore your full database across devices WHY CHRONOLOG? Whether you're a seasoned collector checking COSC-grade accuracy, a hobbyist curious about your Seiko's daily rate, or a watchmaker tracking regulation results — ChronoLog gives you the tools to measure, log, and understand your watch's timekeeping performance. Built by a watch enthusiast in Boulder, Colorado. Download ChronoLog and start measuring your watch accuracy today.

Ratings & Reviews

4.7

out of 5

122 Ratings

Excellent for Watch Enthusiasts
04/20/2024

perrryho
I just recently got into automatic/mechanical watches, and was looking for a way to measure the accuracy of my timepieces. ChronoLog is straightforward, very easy to use and intuitive. I love that the offset, change and rate are all displayed for you, as well as the graphs that help you visualize the changes. Adding a measurement and/or point is also very straightforward.The ability to personalize each watch with a picture and details of the brand, model, purchase date and purchase price are also nice. When you’ve got multiple watches entered into the app, it really gives you a sense of collection whenever you open ChronoLog.Overall, I think ChronoLog is a solid app for watch enthusiasts.

Developer Response
Can't thank you enough for using my app and for taking the time to share this review. If you ever have any feedback or ideas that would make this app more useful, I'm all ears!
Excellent for Watch Enthusiasts
04/20/2024

perrryho

I just recently got into automatic/mechanical watches, and was looking for a way to measure the accuracy of my timepieces. ChronoLog is straightforward, very easy to use and intuitive. I love that the offset, change and rate are all displayed for you, as well as the graphs that help you visualize the changes. Adding a measurement and/or point is also very straightforward.The ability to personalize each watch with a picture and details of the brand, model, purchase date and purchase price are also nice. When you’ve got multiple watches entered into the app, it really gives you a sense of collection whenever you open ChronoLog.Overall, I think ChronoLog is a solid app for watch enthusiasts.
Developer Response 04/22/2024
Can't thank you enough for using my app and for taking the time to share this review. If you ever have any feedback or ideas that would make this app more useful, I'm all ears!
an absolute steal for the functionality
Jan 13

Damon-L
this is my first review on the app store in YEARS. i really can’t remember the last one i did. for the price of entry for this app you get full forever access to catalog your watches with their pertinent data, purchase date, price paid, etc. and with very easily tracking of how slow or fast your watches are running with historical data to see trends over time, as well as the perfect analog clock WITH haptic feedback per second to set your watch right on time very easily. app is attractive and minimalistic to a degree with only the important info displayed. this is the perfect app for someone wanting to casually keep up with watch accuracy.

Developer Response
Thanks for the review! It's a labor of love to build and maintain this side project. Hearing from people who enjoy it is a great reward.
an absolute steal for the functionality
Jan 13

Damon-L

this is my first review on the app store in YEARS. i really can’t remember the last one i did. for the price of entry for this app you get full forever access to catalog your watches with their pertinent data, purchase date, price paid, etc. and with very easily tracking of how slow or fast your watches are running with historical data to see trends over time, as well as the perfect analog clock WITH haptic feedback per second to set your watch right on time very easily. app is attractive and minimalistic to a degree with only the important info displayed. this is the perfect app for someone wanting to casually keep up with watch accuracy.
Developer Response Jan 14
Thanks for the review! It's a labor of love to build and maintain this side project. Hearing from people who enjoy it is a great reward.
Easy way to measure your automatic watch’s accuracy
Mar 5

Xymantix
I have tried a few apps that aid in tracking your watch’s accuracy, and this one is definitely one of the better ones. First of all, it’s easy to take a measurement - due to its “smart prediction” and big (easy to hit when you’re staring at your watch) button. It also has a clock section that helps when setting the time on a watch, as well as tracking other time zones, GMT, etc. Plus, it has a refined UI and a reasonable price, so it’s been pretty useful!
Easy way to measure your automatic watch’s accuracy
Mar 5

Xymantix

I have tried a few apps that aid in tracking your watch’s accuracy, and this one is definitely one of the better ones. First of all, it’s easy to take a measurement - due to its “smart prediction” and big (easy to hit when you’re staring at your watch) button. It also has a clock section that helps when setting the time on a watch, as well as tracking other time zones, GMT, etc. Plus, it has a refined UI and a reasonable price, so it’s been pretty useful!
Larry’s Watches
07/23/2025

Lds91
I was a little skeptical when I fist came upon this application! First let me say I have 8 Watches. Ranging from expensive to the more average affordable prices. This app. Not only works extremely well, it is also a lot of FUN!!After mastering the how to’s and the do’s and don’t’s, I find it highly enjoyable. You can track anything with a sweep or second hand!I’ve been surprised how accurate some on my watches are and some not so much. I highly recommend this for anyone owning a watch.

Developer Response
Glad you took the time to get acquainted to the app and found it useful! Don’t hesitate to reach out if you have feedback on how it can be improved!
Larry’s Watches
07/23/2025

Lds91

I was a little skeptical when I fist came upon this application! First let me say I have 8 Watches. Ranging from expensive to the more average affordable prices. This app. Not only works extremely well, it is also a lot of FUN!!After mastering the how to’s and the do’s and don’t’s, I find it highly enjoyable. You can track anything with a sweep or second hand!I’ve been surprised how accurate some on my watches are and some not so much. I highly recommend this for anyone owning a watch.
Developer Response 07/28/2025
Glad you took the time to get acquainted to the app and found it useful! Don’t hesitate to reach out if you have feedback on how it can be improved!

ChronoLog 2.0 — Major Update NEW: Audio Timegrapher Use your phone's microphone to measure rate, beat error, and amplitude — just like a professional timegrapher. Hold your watch close, tap Listen, and get results in seconds. NEW: Atomic Time Sync Live atomic time display synced via NTP servers. Compare your device clock to true time and use it as a precision reference when setting your watches. Redesigned Watch Cards Your collection view has been completely refreshed. See rate and offset at a glance, access Graphs, Measure, and Audio directly from each watch card. Improved Charts & Filtering Audio and manual measurements now appear together on rate charts. Filter by tag to compare performance across conditions. Tap any point for details. Plus: German language support, collapsible timing runs, inline measurement editing, keyboard-safe modals, and dozens of polish improvements throughout.

Version 2.0.0

Mar 6

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