Turn two Android phones into a synchronized timing system. Dramatically more consistent than a hand-timed stopwatch — no lab hardware required.
Timing, technique, power, reaction, and bar velocity — filmed on the phone you already carry.
Two Android phones become synchronized start and finish gates. Automated splits and reaction off the start cue.
AI biomechanics and jump metrics from a single phone clip.
Upload a sprint video and get frame-by-frame AI biomechanics — joint angles, stride cues, and technique scores.
Vertical jump height and RSI from flight time. Import a clip, get your numbers — no jump mat required.
Train and measure your sprint-start reaction time with drills and trend tracking — free to try in the browser.
Record a set, trim it, tap the plate — get mean concentric velocity, peak velocity, and velocity loss for every rep, plus a bar-path overlay video you can share. All processing happens on-device; your video never leaves the phone.
Independent research (Renner et al. 2024, PLOS ONE) found video-import bar tracking the most accurate smartphone approach to VBT. That's the category this tool belongs to — the study didn't test SpeedTrackr.
By linking two Android phones, SpeedTrackr eliminates the human error of a human thumb on a stopwatch. Get automated splits, highly consistent reaction times, and objective timing data.
“Each session, carefully measured for real performance.”
Position one Android phone at the start line and one on a tripod at the finish. Pair them instantly with a simple 4-digit code.
The devices automatically synchronize their internal clocks over the air — dramatically more consistent than a hand-timed stopwatch.
Sprint through. The start device listens for your starting cue and the finish gate detects your crossing with computer vision, calculating splits instantly.
Ditch the heavy tripods and expensive proprietary sensors. You likely already own the hardware you need.
Laser gates, jump mats, reaction lights, bar-speed transducers
Dual-phone software system (Android)
After 14 years of competitive sprinting in Chennai, the difference between a good day and a bad day came down to hundredths of a second — but real biomechanical feedback meant expensive labs and elite specialists I never had access to.
So I built SpeedTrackr: honest measurement from the processing power already in our pockets. Now I'm using it on myself, publicly — a 52-week program with every session logged and every time trial published.
Follow the live journey — every session logged, every number public.
Practical guides to convert insights into results.
Everything you need to know about setting up and trusting the system.
Download SpeedTrackr for Android today and bring precision timing to your next speed session.
Get the app