Pocket Chrono

Pocket Chrono – Ballistic Chronograph App for Airsoft & Paintball Turn your Android phone into a professional-grade chronograph — no extra equipment needed. Pocket Chrono measures the muzzle velocity of your airsoft or paintball marker using only your phone's built-in microphone and accelerometer. The app detects the muzzle blast through the audio sensor and the physical impulse through the accelerometer, then precisely calculates the time difference between the two events to derive your projectile's velocity in FPS or m/s. Why Pocket Chrono? ✔ No external hardware or accessories required ✔ Free chronograph alternative for airsoft & paintball players ✔ Works with any airsoft gun, AEG, GBB, HPA, or paintball marker ✔ Instant FPS readings right from your pocket ✔ Lightweight, fast, and easy to use — no big setup needed ✔ Perfect for field day checks, gear tuning, and loadout testing Who is it for? Whether you're a casual skirmisher, a competitive speedball player, a milsim enthusiast, or a tech-minded tinkerer who loves tuning their gear — Pocket Chrono gives you a free, reliable way to measure your muzzle velocity without spending money on a dedicated chronograph. Great for: Airsoft AEG, GBB, HPA, and spring gun owners Paintball marker tuning and field velocity checks Budget players who want pro-level data without the price tag Gear reviewers and content creators testing FPS claims Players who need to verify field limits before a game day How it works: Open the app, lean your phone against any suitable target and point whatever you want to measure downrange. Fire a shot — Pocket Chrono listens for the muzzle blast and detects the physical impulse simultaneously. Get your muzzle velocity instantly in FPS or m/s. The Muzzle Velocity and Joule values are only accurate for spherical projectiles. No chronograph rental. No extra gadgets. Just your phone. Download Pocket Chrono and start measuring smarter. © 2026 Pocket Chrono