UnruhFor iPhone
Is your watch running
fast or slow?
Tap when your second hand hits 12 and Unruh compares that instant with atomic reference time. The offset appears right away, down to a fraction of a second.
Free · Unruh Pro is a one-time purchase, not a subscription
The measurement
One tap is all
Unruh needs.
The reference comes from atomic time over NTP synchronisation, not from the clock in your phone. Unruh measures the offset down to fractions of a second and turns it into a rate in seconds per day. If your watch is out by whole minutes, you correct the minute inside the measurement itself.
Collection and standards
Every watch keeps
its own record.
Your collection holds brand, model, movement, serial number and a photo, and each watch is tracked individually. Offset and rate charts cover 7 and 30 days, with averages and the minimum and maximum next to them. Set an accuracy standard and Unruh shows at a glance whether the watch meets it: COSC Chronometer, METAS Master Chronometer, Rolex Superlative or general mechanical.
Two diagnostic tools are part of the free version. The timegrapher, still in beta, reads live beat rate and seconds per day through the microphone, and the magnetism check uses the built-in magnetometer.
Unruh Pro
Pay once,
keep it forever.
The free version holds up to three watches. Pro removes that limit and lets you log how each watch rested: dial up, dial down, crown left, crown up, crown down, or on the wrist. From those entries Unruh works out the resting position that best compensates your watch's rate.
Pro also opens the full history with 90-day and all-time charts, and adds CSV export for your own records. It is a one-time purchase rather than a subscription, and all future Pro features are included.
Privacy
Your collection stays with you.
Unruh collects nothing about you. It contacts public NTP time servers for the reference time, and the timegrapher listens through the microphone while it measures; no audio is recorded, stored or transmitted.
Measure your first watch.
Unruh is fully localised in English and German, gives you haptic feedback at the moment you tap, and can remind you to measure once a day.