Step 1
Connect phones
Pair your phones together. They sync automatically over Wi-Fi.
SG
Built by an OlympianTrackSpeed
Turn your phone into a sprint timer.
Set gates, pick a start mode, run the rep, and review photo-finish proof from the phone already in your pocket.
Auto-timed result
Flying 10m
photo-finish verified
0.99s
10.10 m/s
Race-day setup
How it works
Get started in under a minute. Connect phones, choose the start, position the gate, and run.
Step 2
Start your session
Choose from five start methods—flying start, touch release, countdown, voice commands, or start in frame.
Step 3
Position your phone
Place your phone at the finish line. No calibration needed.
Step 4
Get your time
Run your sprint and get instant results with millisecond accuracy.
Start modes
Five ways to start your sprint
Choose the start method that matches your training goals
Touch Release
Place finger on screen, lift to start. Captures reaction time just like blocks at a real track meet.
Best for: 40 yard dash, combine testing
Voice Command
"On your marks... Set... GO!" AI voice commands with realistic timing based on official rules.
Best for: Solo training, group starts
Countdown
3... 2... 1... BEEP! A visual and audio countdown gives you a predictable start signal. Great for consistent training.
Best for: Solo training, timed intervals
Flying Start
Run through at full speed. First gate crossing starts the timer automatically. Perfect for max velocity testing.
Best for: Speed testing, flying 10m/20m/30m
Start in Frame
Begin stationary in the camera view, then take off. Timer starts when you leave the frame. No second device needed.
Best for: Solo training, single phone setup
Wireless timing gates
Connect multiple phones for precise timing
Use one phone at the start line and another at the finish. Add more phones for split times at any distance.
Wireless Connection
Phones connect automatically via peer-to-peer WiFi. No internet required.
Millisecond-Accurate Sync
NTP-style clock synchronization ensures accurate timing across devices.
Unlimited Gates
Add split timing with 3+ phones. Track acceleration phases and top speed.
Professional timing, zero equipment
Everything you need is already in your pocket
TrackSpeed
~4ms
Timing Accuracy
~4ms
Timing Accuracy
2+
Device Sync
0
Extra Hardware
Smart Detection
Camera-based motion detection triggers timing automatically when you cross the line.
Multi-Device Sync
Connect phones wirelessly. Millisecond-accurate clock synchronization between gates.
Instant Results
See your time the moment you cross. No manual stopwatch delays.
Track Progress
Save sessions, view history, and track improvement over time.
How we compare
Professional timing without the professional price tag
| Feature | TrackSpeedYOU ARE HERE | Freelap | Brower | DASHR | Stopwatch |
|---|---|---|---|---|---|
| Price | Free / $9.99/mo* | $500 - $2,000+ | $1,500 - $5,000+ | $500 - $1,500+ | $10 - $50 |
| Accuracy | ~4ms | ±20ms | ±50-60ms** | ±10ms | ±200ms |
| Chest Detection | Yes (torso only) | No (any body part) | No (beam break) | No (beam break) | Visual guess |
| Setup Time | < 1 min | 5-10 min | 10-20 min | 5-10 min | Instant |
| Hardware | Phone only | Sensors + chips | Gates + pads | Laser gates | None |
| Split Times | |||||
| Photo Finish | |||||
| Portability | Pocket-sized | Carry bag | Carry bag | Carry bag | Pocket-sized |
TrackSpeedYOU ARE HERE
PriceFree / $9.99/mo*
Accuracy~4ms
Chest DetectionYes (torso only)
Setup Time< 1 min
HardwarePhone only
Split Times
Photo Finish
PortabilityPocket-sized
Freelap
Price$500 - $2,000+
Accuracy±20ms
Chest DetectionNo (any body part)
Setup Time5-10 min
Brower
Price$1,500 - $5,000+
Accuracy±50-60ms**
Chest DetectionNo (beam break)
Setup Time10-20 min
DASHR
Price$500 - $1,500+
Accuracy±10ms
Chest DetectionNo (beam break)
Setup Time5-10 min
Stopwatch
Price$10 - $50
Accuracy±200ms
Chest DetectionVisual guess
Setup TimeInstant
*$9.99/mo or $59.99/yr. Prices are approximate.
**Per peer-reviewed study: Brower found "not reliable enough to monitor small changes for elite athletes"
Beam systems trigger on any body part (hand/leg), not chest. TrackSpeed is designed for training, not official competition.
The science behind sub-frame precision
How we achieve ~4ms accuracy with standard phone cameras
Two captures bracket the gate line
Crossing time is estimated between the two positions
Estimated crossing
BeforeChest before line
AfterChest after line
BeforeAfter
Beyond frame-by-frame timing
Learn how it works1
Motion Detection
Frame differencing identifies moving objects. Blob analysis finds the largest motion region (your body) and tracks its leading edge toward the gate.
2
Trajectory Regression
We track position across multiple frames and use linear regression to calculate the precise moment you crossed the gate line—even between frames.
3
Rolling Shutter Correction
Phone cameras scan top-to-bottom over ~5-12ms. We measure where you crossed vertically and compensate for the exact scan timing at that position.
✓
~4ms Effective Accuracy
High-speed capture, multi-frame trajectory analysis, and rolling shutter correction deliver timing precision comparable to professional systems.
Before / after
Brackets the crossing line
~0.5ms
Interpolation resolution
~4ms
Effective timing accuracy
From the track to the code
Built and tested by Sondre Guttormsen
Two-time Olympian. Sole founder and developer.
“I use TrackSpeed to dial in my run-up before competitions. The accuracy is impressive and I always know exactly what speed I'm hitting at takeoff.”
2x
Olympian
$0
Extra hardware
Start timing today
Ready to time faster?
Download TrackSpeed and start training with precision timing today.
~4ms accuracy<1 min setupNo extra hardware
Free to download. Premium features available.