Dual Activity Ghost Runner Comparator - Head-to-Head Analysis
Compare today's race against your personal best from 6 months ago. Quantify cardiovascular efficiency gains and pacing improvements.
How to Use Activity Comparator in 3 Simple Steps
Step 1: Upload
Drag & drop your .FIT, .GPX, or .TCX activity file. All processing is 100% private in your browser.
Step 2: Process
FitCrop inspects telemetry streams, removes anomalies, recalibrates metrics, or fixes binary checksums.
Step 3: Export
Download your clean Strava, Garmin, and Zwift compatible file with 1 click. Zero server wait.
Frequently Asked Questions
How do I compare two GPX files on the same route?
FitCrop synchronizes distance checkpoints across both files, showing you exactly where you gained or lost seconds, Watts, or heart rate efficiency.
What is cardiovascular efficiency gain?
Cardiovascular efficiency gain occurs when you complete the same route at a faster pace or higher wattage with a lower average heart rate.