Precision Drift Analytics
Transform your smartphone into a professional drift analyzer. Kalman-filtered slip angles, real-time G-forces, and aerospace-grade sensor fusion — all in your pocket.
Built for Serious Drifters
Every feature engineered with precision. From the physics engine to the UI, DriftMeter is designed for drivers who demand accuracy.
Real-Time G-Meter Dashboard
Watch lateral and longitudinal G-forces in real-time on a beautiful, responsive display. The G-meter visualizes your exact position on the friction circle, helping you understand weight transfer and grip limits as you push your car.
Live DataKalman-Filtered Slip Angles
Not just raw gyro data — we use an Extended Kalman Filter to fuse high-rate IMU with GPS COG, delivering slip angle measurements accurate to ±0.5 degrees.
EKF Algorithm60Hz Sensor Fusion
High-frequency DeviceMotion capture at 60Hz ensures you never miss a moment. Combined with GPS, every drift is reconstructed with millisecond precision.
GPS Route Mapping
Every session records your full GPS path. See exactly where your best drifts happened, analyze corner entry points, and track your progression on familiar tracks.
Competitive Leaderboards
Your lifetime stats feed into global leaderboards. Compare your best maximum angle, highest entry speed, longest drift duration, and overall drift scores against drivers worldwide. Rise through the ranks and prove you're the best.
Global RankingsDrift-by-Drift Analysis
Each drift is automatically detected and scored. Review entry speed, exit speed, max angle, average speed, and duration for every single drift in your session.
Session History Vault
All your sessions stored locally and synced. Filter by date, track, or score. Your complete drift history at your fingertips.
One-Tap Sharing
Generate shareable links instantly. No sign-up required — anonymous device IDs keep it simple while letting you flex your best runs.
Aerospace-Grade Algorithms
The same sensor fusion techniques used in aircraft navigation systems, now measuring your slip angles.
GPS-IMU Time Alignment
GPS data typically lags behind IMU data by 0.5 to 1.5 seconds. Most apps ignore this — we don't. Our backend uses scipy cross-correlation to compare yaw rate against the derivative of GPS Course Over Ground, calculating the exact sample lag and shifting GPS data backward in time for perfect alignment.
- Sub-millisecond time synchronization between sensors
- Cross-correlation analysis for optimal lag detection
- True slip angle = heading - GPS course over ground
def process_session(imu_data, gps_data):
# Align GPS lag via cross-correlation
lag = correlate_yaw_cog(imu_data, gps_data)
gps_aligned = shift_samples(gps_data, lag)
# EKF: predict with gyro, update with GPS
ekf = KalmanFilter(dim_x=2, dim_z=1)
ekf.Q = 0.01 # Process noise
ekf.R = 5.0 # GPS measurement noise
for sample in aligned_data:
ekf.predict()
ekf.update(sample.gps_cog)
slip_angle = ekf.x[0] - sample.gps_cog
Four Steps to Precision
From mounting to analysis in under a minute. No external hardware required.
Mount & Secure
Fix your phone rigidly in your car. Dashboard mount, windshield, or any stable surface works.
Calibrate Sensors
Tap calibrate while stationary. We establish your baseline orientation and zero all axes.
Start Recording
Hit record and drive. Our 60Hz capture runs in background. Drift as much as you want.
Analyze & Compare
Stop recording. Get instant analysis: slip angles, speeds, scores, and your position on the leaderboard.
Your Drift, Quantified
A composite score that rewards angle, speed, and control. Master all three to top the leaderboard.
Drift Score
Global Leaderboards
See how your skills stack up against drifters worldwide.
🏆 Top Drift Scores
Anti-Cheat Validation
Leaderboards mean nothing if they can be faked. DriftMeter uses physics-based validation to ensure every recorded drift is legitimate. No shaking phones in pockets, no simulator exploits — just real driving.
Common Questions
Everything you need to know about DriftMeter.
How accurate is the slip angle measurement?
Our Kalman-filtered approach achieves ±0.5° accuracy under normal conditions. The Extended Kalman Filter fuses 60Hz gyroscope data with GPS course-over-ground, correcting for sensor drift and noise in real-time.
Do I need any external hardware?
No. DriftMeter uses only your phone's built-in sensors (accelerometer, gyroscope, GPS). Just a solid phone mount is recommended for best accuracy.
How does anti-cheat work?
We analyze physics signatures: minimum speed thresholds, maximum yaw rate limits (phones spinning in hand exceed car limits), Z-axis variance (detects loose/handheld phone), and lateral G correlation with slip angle.
Does it work on track or only public roads?
DriftMeter works anywhere you can get GPS signal. Track days, skidpads, parking lots, mountain roads — anywhere you drift, we measure.
Can I use it without internet?
Yes. Recording works fully offline. Sessions are processed and synced when you reconnect. Your leaderboard position updates once you're back online.
What phones are supported?
Any iPhone with iOS 15+ that has gyroscope and GPS capabilities. Newer phones with better IMU hardware will produce slightly more accurate results.
Ready to Quantify Your Drift?
Join thousands of drivers using professional-grade telemetry. Download DriftMeter today.