Local-first file analysis
Choose a FIT, GPX, TCX, or RaceBox CSV file and analyze it directly in the browser. Your local file remains in your browser unless you explicitly create a share.
Cyclocross race analysis for every lap.
Lap Track turns FIT, GPX, TCX, and RaceBox CSV activity files into a focused cyclocross race analysis workspace. Compare laps and sectors, find where time was lost, and understand how power, cadence, heart rate, speed, grade, and elevation shaped your ride.
Open Lap Track
Race analysis features
Built for repeated comparison after training and racing.
Race-window detection
Separate the sustained race effort from warm-up, cooldown, and extra recording before refining the detected start, finish, and lap boundaries.
Lap and section review
Compare the same course positions across laps, identify the fastest sections, and see where each lap gained or lost time.
Strava activity access
Connect Strava to browse and load authorized activities directly into Lap Track. The integration is optional; direct FIT, GPX, TCX, and RaceBox CSV file analysis remains available.
Sectors across every lap
Compare six consistent course-location sectors across laps. Select a sector from the review bar or selector to highlight its grouped map ranges.
Power and quadrant analysis
Explore power zones, variability index, efficiency factor, and cadence-versus-power quadrants using FTP and a 90 rpm boundary.
Interactive course maps
Color the course by power, heart rate, speed, cadence, grade, elevation, sections, or race performance with playback and grayscale elevation relief.
Performance charts
Inspect highlighted datapoints with reference lines for FTP, threshold heart rate, and 90 rpm across the relevant charts.
Playback and lap racers
Replay the race on the map with a yellow position marker, optional fastest and optimal lap markers, or colored lap racers that compete against the race clock.
Video race sync
Load a YouTube race video, mark the video position that matches race start, and follow heart rate, power, cadence, speed, laps, charts, and the map while the video plays.
High-rate telemetry
Use RaceBox 10 Hz or 25 Hz GPS data for detailed course traces, turn analysis, lean angle, bumpiness, and smoothness where the source file provides the required sensors.
Share an activity analysis
Create a time-limited link for a local FIT, GPX, TCX, or RaceBox CSV activity. Choose a 7, 30, or 90-day expiry, optionally add a password, and share a read-only analysis with a coach or athlete. Shared links can start playback automatically.
AI coaching prompt
Copy a structured prompt containing race metrics, lap comparisons, sections, sectors, zones, elevation, and temperature data when recorded for an AI coaching summary.
Multi-activity comparison
Add up to five matching activities from local files, private Lap Track links, or eligible Strava activities. Select All to compare course segments, routes, charts, and playback dots, or select one activity for the normal lap analysis.
How Lap Track works
1. Load activity data
Open the app and choose an exported FIT, GPX, TCX, or RaceBox CSV activity file.
2. Inspect the race
Review the detected race window, laps, sectors, course sections, maps, charts, zones, and pacing patterns.
3. Compare or share
Add another activity from the same course, sync a YouTube race video, select All to compare activities, or share a private local analysis with a coach or athlete.