Runs locally No data stored on server Free Not medically validated
For research / educational use only. Always confirm findings with calibrated clinical equipment.
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Drag the four pins to the actual paper corners. Then press Apply.
Measure net QRS deflections on Lead I and Lead aVF to compute the Frontal QRS Axis.
Measure 5-10 consecutive R-R intervals with the caliper to analyze R-R variation and short-term HRV.
Measure 5-10 consecutive P-P intervals with the caliper to analyze P-P coupling variation and sinus/atrial rate variability.
Dr Yusuf Hoşoğlu · 2026
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