JoyAnalyze
SENSOR ACCURACY
Compare power meters, smart trainers, heart rate monitors, and radar tail lights with protocol-level precision.
THE PROBLEM
When you ride with a power meter, a smart trainer, and a cadence sensor, all three record data at slightly different sampling rates and slightly different times. Comparing them directly produces noise that hides the real signal.
JoyAnalyze solves this with time-axis dynamic stretching: manually mark shared events, or let the algorithm find power peaks automatically. We use DTW (Dynamic Time Warping) to align the signals, then compute statistical error metrics.
Start a new comparison
New comparisonThe JoyAnalyze on-device activity history lives in your browser’s localStorage. Open the upload tool to import a FIT / GPX / PWX / CSV file, or compare multiple rides side-by-side. No account required.
Analysis Modules
Power Accuracy
1s, 5s, 1min, 20min MMP error analysis across power meters, trainers, and pedals.
Radar Detection
Compare radar tail light detection rates and false-positive frequency in real traffic.
HRM Accuracy
Compare heart rate monitor latency, accuracy, and signal stability across chest straps and optical armbands.
RUNS IN YOUR BROWSER
No install, no app, no upload. Open the page on any device that has a browser and drop your files in — the parsing happens on your machine. Nothing is stored on a server, so nothing syncs between your devices either.