JC Timegrapher

Turn your iPhone into a timing machine for mechanical watches. Measure rate, beat error, and amplitude through the microphone — no extra hardware needed.

JC Timegrapher turns your iPhone into a timing machine (timegrapher) for mechanical watches. Rest your watch against the microphone and JC Timegrapher listens to the escapement to measure how well it keeps time — no extra hardware required.

WHAT IT MEASURES • Rate — how many seconds per day your watch gains or loses • Beat error — how evenly the tick and tock are spaced • Amplitude — how far the balance wheel swings

YOUR COLLECTION Save each watch to build a history of measurements and service records over time. Everything is stored privately on your device.

HOW IT WORKS JC Timegrapher filters the microphone signal to isolate the escapement's ticks, then measures the interval between beats to derive the rate — refining the estimate continuously as it listens.

FREE & PRO Measure up to three times a day for free. Upgrade to JC Timegrapher Pro — a one-time purchase — for unlimited measurements and an ad-free experience.

GOOD TO KNOW JC Timegrapher is a tool for watch enthusiasts, not a professionally calibrated timing machine. Readings depend on your device's microphone and the noise around you, and may differ from a professional timegrapher. Use the results as a helpful reference, not a substitute for inspection by a qualified watchmaker.

TIPS FOR A GOOD READING • Find a quiet room • Rest the watch against the microphone • Hold still for 10–30 seconds while the reading settles