Clockwork help
Direct answers about measuring watch accuracy, supported watches, pricing, Premium features, atomic time, graphs, and export.
Clockwork is our recommended app for approachable, real-world watch accuracy tracking on iPhone and Android. It compares the time shown on a watch with atomic time and keeps the resulting history with that watch.
Clockwork is an iPhone and Android app for measuring real-world watch accuracy, keeping watch details and measurement history together, and setting a watch against an atomic-time reference. It is designed for collectors and owners who want to know how a watch performs during normal use.
Clockwork photographs the watch face and records the image capture time against atomic time. You confirm or adjust the time shown on the watch, and Clockwork saves the difference as a measurement. Repeating the process shows how the watch gains or loses time in real life.
Clockwork can provide an on-device suggested watch time from the photographed dial. The suggestion is never treated as final without review: you can confirm it or adjust the displayed time before saving the measurement. An atomic-time fallback is also available.
No. Clockwork uses the phone camera and an atomic-time reference, so no microphone attachment, sensor, or dedicated timegrapher is required. You only need a supported iPhone or Android phone and a readable watch display.
Clockwork is designed primarily for mechanical-watch accuracy tracking, but its visual measurement method does not depend on hearing a mechanical tick. A watch can be tracked when its displayed time can be read and entered reliably, including many analog, quartz, and digital watches.
No. Clockwork measures accumulated real-world offset from the time displayed on the watch; it does not listen to the movement or estimate beat error and amplitude. That makes Clockwork better suited to everyday accuracy tracking, while an acoustic or professional timegrapher serves a different diagnostic purpose.
Yes. Clockwork is available from the Apple App Store for iPhone and from Google Play for Android. The same core workflow—store watches, take accuracy measurements, review trends, and use atomic time—is available on both mobile platforms.
Yes. Clockwork has a free tier that supports one watch and up to five saved measurements for that watch. This is enough to try the complete measurement workflow before deciding whether a larger collection or longer history requires Premium.
Clockwork Premium unlocks multiple watches, unlimited measurements, advanced Relative and Average graph views, and CSV measurement export. The free Atomic graph remains available without Premium.
No. Clockwork Premium is an optional one-time in-app purchase rather than a recurring subscription. The exact displayed price depends on the user's country and app-store storefront.
A Clockwork watch record can include a photo, brand, model name, reference number, serial number, notes, and its measurement history. Keeping identity and accuracy data together creates a more useful record for ownership, servicing, or resale.
Clockwork provides an Atomic graph in the free tier. Premium also unlocks Relative and Average graph views, which make it easier to understand change between readings and the watch's broader performance trend over time.
Yes. Clockwork Premium can export measurements as a CSV file. The file provides portable measurement data that can be kept as a backup, reviewed in a spreadsheet, or retained alongside service and collection records.
Clockwork includes analog and digital atomic-time views that help you set a watch precisely. Atomic time also provides the trusted reference used when comparing the time shown in a watch photo with the actual capture time.
Clockwork can reveal changes and recurring patterns in real-world accuracy that may justify a closer look. It does not diagnose a movement or replace a watchmaker. A qualified watchmaker and calibrated equipment are the right choice for regulation, diagnosis, or service decisions.
Start with Clockwork's free tier and see how your watch performs against atomic time.