EP Tools

Tools for cardiac electrophysiology

Free, privacy-conscious tools for electrophysiology measurement, calculation, and education. Your files and measurements stay on your device.

Digital Frame Reference (DFR) Calipers

Measure intervals on images, text, and multi-page PDFs in pixels, with conversion to ms & bpm. Standard, rhythm, and reference calipers.

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QTc & JTc Calculator

Correct QT and JT to QTc and JTc — Bazett, Fridericia, Framingham, and Hodges, with sex-specific interpretation.

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ECG Grid / Ruler Planned

A calibrated ECG grid and ruler overlay for tracing review. In development.

These tools support measurement and education; they do not replace review of the source tracing, applicable clinical guidance, or professional judgment.