⚡ Freespeed Power Analyzer

Upload a CSV file 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 (Bland-Altman, error metrics)
  • 4 Smooth mean-max power curves

Open the Freespeed app, run a comparison test, export as CSV, then upload using the sidebar.

⚡ Test Analysis
Date
—
Duration
—
Avg Power
—
Max Power
—
Power Over Time
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Heart Rate
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Cadence
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Speed
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Advanced Pedal Metrics
Only available from dual-sided power meters.
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Mean Max Power
Smooth curves showing the best average power each device can sustain for any given duration. Hover to read values.
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📋 CP data points
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