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Hold your iPhone close to your watch in a quiet environment. Skew uses the microphone to listen for the ticking sound and calculates the beat rate from those timings. This is a ballpark check — useful for verifying your watch is running near its rated BPH, but not used to log drift. Audio is processed on-device and never stored or transmitted.

Accuracy depends on how much time has passed between measurements — the longer the interval, the more precise the result. For manual drift logging, we recommend waiting at least 24 hours between syncs. For tick detection, background noise or a worn-out mainspring can affect results. Try recording in a quiet room with the microphone close to the watch crown or caseback.

Tap the + button on the main watch list screen. Enter the watch name and any details you'd like to track, then save. You can edit these details at any time from the watch detail view.

Open a watch, then tap "Log Drift." Set your watch to exactly match the displayed GPS time, then tap Save. When you return later, tap "Log Drift" again — Skew will calculate the drift rate between your two syncs.

To delete a watch, swipe left on it in the watch list and tap Delete. To delete an individual drift log, open the watch detail view, swipe left on the log entry, and tap Delete. Deleted data cannot be recovered.

Yes. Skew syncs your watches, drift logs, and wear sessions across all your devices via iCloud. Make sure you're signed in to iCloud on each device.

It's a measure of how much your watch gains or loses relative to accurate time over 24 hours. A rate of +5 s/day means your watch gains 5 seconds every day. COSC certification for automatic movements requires ±4 to ±6 s/day.