ChronoLog • Watch Accuracy

ChronoLog • Watch Accuracy

Timegrapher & Collection Log

233 ratings
100 reviews
Free
In-App Purchases

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


Price history


Details

Released
August 8, 2023
Updated
October 20, 2026

Features

ChronoLog • Watch Accuracy screenshot #1 for iPhone
ChronoLog • Watch Accuracy screenshot #2 for iPhone
ChronoLog • Watch Accuracy screenshot #3 for iPhone
ChronoLog • Watch Accuracy screenshot #4 for iPhone
ChronoLog • Watch Accuracy screenshot #5 for iPhone
ChronoLog • Watch Accuracy screenshot #6 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

2.6.0

October 20, 2026

Accuracy Report • A health score for every watch, timekeeping trends by timing run, and an anonymous comparison against the same models worldwide. • Open it from the Info tab or from any watch. Share a private link that expires on its own. • Your watch photos now appear in the report. Timegrapher • Every audio reading now shows a confidence score, so you know when to trust it. • Clearer per-run detail in audio results. Moon phase • Last and next full moon with days since and until — the numbers you set a moonphase complication from. • The moon is now drawn correctly in light mode and for your hemisphere. Fixes • Clear error messages when the camera or cropper fails. • Photo measurements now apply the atomic-time correction. • The audio screen no longer crowds the Listen button. • The listing now shows the app's German and Spanish localizations.

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Subscriptions & In-App Purchases

$6.99

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Lifetime Access to All Features

User reviews

Great App

I used the free trail to measure my Khaki King that seemed to be running fast (confirmed it’s gaining 20 seconds per day). I ended up buying premium because I appreciate apps that still offer a one time purchase option and that have a simple, easy to use UI.

Response from developer

Thank you so much for trying out the app and leaving a review! If you ever want to get in touch about feedback or suggestions for how I can make it an even better value, please don't hesitate to reach out!

Best app I’ve tried yet to track my watches

This app pretty much does all you could ask: logs your wear time, tracks your watches accuracy by both manual input and the ability to take a picture, as well as work as a Timegrapher which admittedly I haven’t tried that feature since I have an actual Timegrapher. The other feature are pretty much flawless and the app is laid out extremely user friendly. I really like the fact that it gives you stats on what watch you wear the most/least, most recent, and what hasn’t been on your wrist in a long time. Just buy this app you won’t be disappointed
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Response from developer

I appreciate you taking the time to leave a kind review! If you have any feedback in the future, please feel free to reach out!

Keine Funktion

Geräusche angeblich zu leise - ist eine Standuhr, die man einen Raum weiter noch hört…😆

Bisher die beste App zum Thema

Ich habe sämtliche Apps zum Funktionsumfang „Dokumentation der Sammlung“, sowie „Vermessung der Sammlung“ im AppStore getestet (inkl. Premium Funktionen) und muss sagen diese App hier ist der beste Allrounder.
Es gibt Apps, bei denen die KI Automatismen eventuell etwas akkurater treffen, aber das ist eine absolut sekundäre Funktionalität.
Bei der Abweichungsdokumentation ist das Ergebnis hier übersichtlich gestaltet und schnell erfasst.
Gerade bei größeren Sammlungen leidet die Übersichtlichkeit bei der Konkurrenz stark.
Positiv nennen muss man hier auch die Update-Politik, denn die kommen oft, bzw. regelmäßig mit sinnigen Verbesserungen.
Die Audiomessung funktioniert inzwischen auch super.
Was ich mir da allerdings noch wünschen würde, wäre dass das dot-Protokoll mit Beat-Error und Amplitude auch nach der Erfassung noch einsehbar ist - es bleibt leider nur der ermittelte Wert ersichtlich, den Rest muss man direkt nach der Erfassung mit einem Screenshot speichern, sonst sieht man es nie wieder - deshalb einen Stern Abzug.
Ein weiterer Verbessungsvorschlag wäre noch, das man zum verwendeten Gerät eventuell eine Grafik hätte, mit der man die genaue Position des zur Audiomessung verwendeten Mikrofons einsehen kann.
Das bekommt man zwar auch mit einer Internetrecherche heraus, aber gerade neuen, oder technisch unbedarften Nutzern würde man so den Weg zu einem genaueren Ergebnis bereiten.
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Nu recomand

După câteva folosiri a început să nu mai “audă” microfonul telefonului (semnal slab), deși microfonul nu are nici o problemă. A devenit inutilă…

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.