Watch Tracker vs Ratekeeper

Measure how your watches really run - day by day. Watch Tracker helps you record accuracy, spot trends, and catch issues like magnetism, all with a clean workflow made for collectors and tinkerers. Build your collection - Add each watch with a friendly guided form (help tips included). - Edit or remove any time—by default you can track one watch; unlock unlimited with a one-time in-app purchase. Record accuracy in seconds per day (SPD) - Start a measurement and tap when your watch matches the reference time. - We color-code the result (fast/slow) and calculate seconds per day, the standard way enthusiasts and chronometer tests express rate. View history charts and long-term trends to see how your regulation or service impacted performance. wristlog.com Smart reference time - The app fetches an atomic-time-disciplined reference (with a clear progress spinner). If the network is unavailable, it gracefully falls back to device time so you never lose a session. Capture real-world context - Add an optional note and watch position (dial up, dial down, crown up/down/right)—the same orientations used in chronometer testing—so you can compare positional variance. Time Sync utility - See the current time adjusted by the atomic offset and re-sync whenever you like—useful for setting your collection precisely. Magnetism Check - Use your phone’s built-in magnetometer to watch the surrounding field (in μT). Set a baseline; values turn red when the field spikes beyond a safe threshold. Magnetized hairsprings often stick coils together, making a watch run fast—or even stop—so catching spikes early matters. Exports for your records - Share a crisp Accuracy Card (PDF/PNG) summarizing current rate and trend chart. - Export a CSV of all measurements for your personal logs or watchmaker. Why it helps - Clarity: SPD + charts make performance easy to understand and compare. - Context: Positions and comments reveal what really changes rate. - Confidence: Atomic-time reference reduces guesswork when setting or regulating. - Care: Magnetism is common in modern life (speakers, bags, gadgets); quick checks help you avoid surprises between services. Thoughtful by design - No account required. - Works offline after first sync (network only needed for reference time). - Fast, friendly, and built for everyday use. Whether you’re tracking a new diver, tuning a cherished vintage piece, or keeping a whole box on-spec, Watch Tracker gives you the tools to measure, understand, and enjoy your watches more.

Every mechanical watch has a rate: a few seconds gained or lost each day, as personal to the movement as a fingerprint. Ratekeeper tells you what yours is, exactly, without a timing machine or a trip to the watchmaker. The method is a five-second pleasure. Set your watch to true time. A day or two later, tap the screen the instant the second hand crosses twelve. Ratekeeper compares that tap to atomic network time (accurate to hundredths of a second) and, from two readings, works out the watch's rate in seconds per day. Gaining or losing, and by exactly how much. That's the whole thing. No microphone, no cradle, no gear. Just your watch, your phone, and a tap. WHAT YOU SEE • The rate, plainly. "+5.4 spd". In words, "gains 5.4 seconds a day," so the sign never has to be decoded. • A history that reads like a story. Every reading is grouped into runs (a run begins each time you set the watch) and charted so you can watch a rate settle in as a fresh service beds down, or drift as it comes due for one. • Against a band, if you want one. Hold a watch to −4/+6 seconds a day, or the tighter 0/+5, and see at a glance whether it's keeping to spec. • By resting position. Dial up, crown down, on the wrist: a mechanical watch runs differently in each. Ratekeeper breaks the rate down position by position and even suggests how to rest it tonight to bring it closer to true. • A true-time reference clock. A standalone screen showing network time to the tenth of a second, so you can set any watch against it. BUILT FOR PEOPLE WHO CARE ABOUT WATCHES • Manual, automatic, quartz, or something else: each is measured on its own terms. • Gentle reminders on your rhythm, so readings land a few days apart the way the math wants. • Export every reading to CSV whenever you like. The data is yours to keep. PRIVATE BY DEFAULT No account. No sign-up. No ads. Your watches and readings live on your device and sync across your own devices through your own private iCloud. We can't see them, and nobody is building a profile out of your collection. Find out how your watches really run. Every one of them has a rate. This is how you learn it. Have questions? We're here to help. Email us at hello@slowsundaysoftware.com Terms of Use: https://slowsundaysoftware.com/terms Privacy Policy: https://slowsundaysoftware.com/privacy