Twelve O'clock vs Watch Tracker

Twelve O’clock is an app that helps track your watch accuracy easily in a realistic way. I can’t stress this enough: it’s “tracking”, not measuring instantaneous accuracy like a timegrapher device. It’s a manual and oldschool job but it brings so much fun. It reminds me of the old days when I had to synchronize my watch to the clock on the TV at 7pm every day. With Twelve O'clock you can: ** MANAGE YOUR WATCH COLLECTION * Add, edit, remove any item in a list of your watch collection * Include a nice wristshot of each watch ** KNOW YOUR WATCH ACCURACY * Simply add some checkpoints and let the app calculate the accuracy in *second per day* * A nice chart of the accuracy over the time ** LEARN MORE ABOUT HOROLOGY * Curated content for watch lovers (like me)

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.