Freespeed Power Comparison Analysis
Upload CSV or FIT files exported from the Freespeed app to get started.
What you'll get:
- 1 Summary statistics for every device in your test
- 2 Interactive power-over-time charts
- 3 Device agreement analysis
- 4 Smooth critical power curves
Open the Freespeed app, run a comparison test, export as CSV or FIT files, then upload using the sidebar.
Power Test Analysis
Date
—
Duration
—
Average Power
—
Max Power
—
Power Over Time
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Critical Power
Smooth curves showing the best average power recorded by each device for any given duration. Hover to read values.
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CP data points
Heart Rate
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Cadence
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Speed
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Only available from dual-sided power meters.
Pedal Balance
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Torque Effectiveness
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Pedal Smoothness
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Correlation Matrix
Values close to 1.000 indicate strong agreement between devices.
Summary Statistics
Device Agreement
ℹ️ How to read these results
Mean Diff — Average power difference. Negative means the device reads lower than the reference.
Bias % — Mean difference as a percentage. Closer to 0% = better agreement.
MAE — Average size of the difference ignoring direction. Lower is better.
RMSE — Like MAE but penalises large errors more. If RMSE ≫ MAE, there are occasional big discrepancies.
R² — How well devices track each other (0–1). Above 0.95 is excellent; above 0.99 is outstanding.
Difference over time: Top panel = watts, bottom = percentage. Consistent values near zero = good agreement.
Session Metadata
Accuracy Statistics (from CSV header)
Time-Series Data