Hold your watch to the phone. See how it runs.
Beat & Rate listens to the ticks and shows the daily rate, beat error and amplitude side by side, with a live trace of every beat. It finds the beat rate itself, and when the ticks are faint it tells you what would help instead of stopping at “too much noise”.
US$3.99 one time · No subscription, account or ads · Works offline
A timegrapher in your pocket, for watches and clocks.
Seconds a day fast or slow, the tick-tock imbalance in milliseconds, and the balance swing in degrees, averaged over 10, 30 or 60 seconds.
The meter shows how far to trust the numbers and what would help: closer contact, a quieter spot, another microphone. Faint ticks are averaged over several beats.
Any wired microphone the phone offers is analysed the same way as the built-in one. Pick it from the Input menu.
A guided run through dial up, dial down and four crown positions, then the spread between the fastest and slowest one.
Pendulum, mantel, cuckoo and 400-day clocks: beats per hour, an in-beat check, and the daily rate against the beat rate your clock should run at.
Save readings, see the rate over time, and export everything as a CSV file. Nothing leaves your phone otherwise.
Three steps, about a minute.
Case back or crown against the bottom edge of the phone, in a quiet spot. For a clock, set the phone on the case.
The beat rate is found in a few seconds; the numbers settle as the averaging window fills.
Keep it with that watch or clock, or run all six positions.
Readings are estimates. A phone's own clock can be a few seconds a day off, and every rate inherits that; if you know your phone's error, enter it once as a calibration.
Before you download.
How accurate is it?
Beat & Rate times every beat it hears and fits a line through them. The rate also carries your phone's own clock error, which can be a few seconds a day; if you know it, enter it once as a calibration. A watch's own rate also wanders a little from minute to minute and position to position. All readings are estimates, not a laboratory measurement.
Which watches and clocks work?
Mechanical watches at the standard beat rates from 12,000 to 72,000 beats an hour, found automatically, and pendulum, mantel, cuckoo and 400-day clocks from 400 to 14,400 beats an hour. Quartz watches and clocks are not supported. Amplitude needs your movement's lift angle; 52° is the default.
Which microphones can I use?
The phone's built-in microphone, or any wired headset or USB microphone the phone offers, chosen from the Input menu. Bluetooth microphones are not offered, because their delay and processing are unknown.
Does it record me?
No. The microphone is used only to hear the ticks. Audio is analysed on the phone as it arrives and is never stored or sent. See the privacy policy.
Is there a subscription?
No. Beat & Rate is a one-time purchase of US$3.99, with no subscription, account or ads. Prices outside the US vary by country or region.
Know how your watch is running.
