Measure how fast or slow your mechanical watch runs, in seconds per day. One tap per reading, no extra hardware, and nothing ever leaves your phone.
How it works
Look at the watch, tap when the second hand passes a mark, and enter the time the dial showed. The app records your iPhone's own time alongside it and works out the drift between readings — so the longer you keep measuring, the more precise the rate becomes.
- Track as many watches as you like, each with its own name and colour.
- Rate in seconds per day, computed from the readings you have taken.
- Time zones are recorded with each reading, so travelling does not corrupt the series.
- No timegrapher, no microphone, no accessories.
Privacy
Time Delta has no network access at all. See the privacy policy.