Acoustic Chrono

Bow. Arrow. Data. Know your speed.

Acoustic Chrono estimates arrow speed from sound. Place your phone safely beside the bow, enter the accurately measured target distance, record the bow release and target impact, then review the waveform, timing markers, confidence and calculated velocity curve.

Explore before you unlock

The free Android download includes a permanent interactive Demo Mode with three real sample recordings. Inspect waveforms, adjust markers, review results and confidence, and explore velocity graphs without granting microphone or location access.

Lifetime Access

Unlock real recording and data export with a one-time Google Play purchase. No subscription. Your bow profiles, arrow profiles, recordings, shot history and calculations stay local on your device unless you choose to export them.

Built for useful field diagnostics

• Raw uncompressed audio capture

• Automatic release and impact detection

• Manual waveform-marker correction

• Measured average speed and clearly labelled modelled launch estimate

• Confidence information and velocity graphs

• Separate bow and arrow profiles

• Local shot history and export tools

• Manual temperature with phone-barometer pressure where available

Important measurement and safety information

Measure from the target to where the shooter is standing using tape or rangefinder. Keep the phone within 0.5 m of the bow, outside the arrow path and safe shooting area. Complete setup before drawing the bow and do not interact with the phone while shooting.

Acoustic Chrono is an estimation and diagnostic tool, not a certified chronograph. Results should not be treated as certified measurements until independently validated.

Privacy first

Acoustic Chrono does not use location services or online weather data and does not include advertising or behavioural analytics.

Developer: AcousticChrono, operated by Matt Hyland

Support: acousticchrono@gmail.com