Isochron

Isochron turns the readings you take by hand into a clear picture of how a mechanical watch is performing.

Log a reading in seconds Enter a rate measurement for any position — dial up, dial down, crown up, left, or right — and Isochron adds it to that watch's history.

See the trend, not just the numbers A regression line shows daily rate drift over time, and a positional chart shows how much a watch's rate varies from one position to another.

Keep a full service history Record services, adjustments, and notes for each watch, so you always know what's been done and when.

Track strap wear Log strap changes and wear alongside the rest of a watch's history.

Built for a small collection Manage multiple watches, each with its own rate history, service log, and notes.

Yours alone All data stays on your device, with a simple backup export — no account, no cloud, no ads.