Rowing Stroke Rate Stopwatch vs Glider Frequency

Strokes Per Minute is a simple rowing timing calculator for coaches, coxes and rowers. Tap to start, count the selected number of complete rowing strokes, then tap again to calculate the stroke rate. • See strokes per minute and seconds per stroke on iPhone and iPad. • Choose how many strokes to time. In continuous mode, each tap finishes one measurement and starts the next. • Hear results spoken aloud on iPhone and iPad, with optional haptic feedback on supported devices. • View previous readings beside the timer on wider layouts, including iPhone Duo. • Use the simple stroke-rate display on Apple Watch. • Read large numbers in light or dark mode. Rowing measurement values are not sent to analytics. A subscription or one-time purchase is required for ongoing use. Support: support@strokesperminute.app Terms of Service: https://strokesperminute.app/legal/terms/ Privacy Policy: https://strokesperminute.app/legal/privacy/

Fix your phone to anything that vibrates and measure its frequency in Hz or per minute. Glider wings, wing beats, machine vibration, springs, flexing boards — anything that repeats. FEATURES - Finds the frequency by running an FFT on the accelerometer waveform - Estimates down to 0.01 Hz with a Hann window, zero padding and peak interpolation - Automatically removes the effect of tilt - Real-time frequency spectrum and confidence level - 10-second average - Adjustable analysis window (5, 10 or 20 s), sensor axis and minimum frequency - Built-in tutorial for first-time users HOW TO USE 1. Fix the phone firmly to the object, screen facing up 2. Press Start to begin a 3-2-1 countdown 3. Start the vibration and the frequency appears Measurement range is roughly 0.5–50 Hz.