Watch Accuracy Tracker

How fast is your mechanical watch, really? Watch Accuracy Tracker measures the true rate of any watch by tap-syncing against atomic time — no microphone, no timegrapher hardware, no subscription. Tap the moment the second hand passes 12, and the app compares your watch to an atomic reference time pulled over the network. Do it again hours later and it computes your rate in seconds per day, automatically pairing measurements and charting the trend across days and weeks. KEY FEATURES • Tap-sync measurement — offset vs atomic time to ±0.1s, works on any watch (automatic, manual, quartz, even smartwatches) • Seconds-per-day rate — auto-calculated from measurement pairs, no math required • Rate trend charts — see each watch drift over time on a clean sparkline • Position comparison — tag measurements by storage position (crown up, dial up, on wrist) and see "crown up: +2 s/day" • Collection manager — log every watch with movement notes, all stored locally • Service due alerts — a worsening rate trend flags when a service may be needed • COSC reference — compare your rate to the chronometer standard of −4 / +6 seconds per day WHY IT'S DIFFERENT Most accuracy apps hide logging behind a subscription or force a microphone-based timegrapher. This is free, needs no microphone, and focuses on what collectors actually track: how each watch performs day to day, and which storage position keeps it closest to zero. PERFECT FOR • New automatic owners checking a fresh Seiko or Rolex against COSC • Vintage collectors monitoring a service candidate • Anyone dialing in a watch winder position Works offline using device time (clearly flagged), syncs to atomic time when online. Your collection stays private on your device. Stop guessing. Start measuring your watch's real accuracy today.