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.
NEW Updated macOS and Windows apps add rhythm calipers, refined interaction, and improved multi-display support.
Launch tool →QTc & JTc Calculator
Correct QT and JT to QTc and JTc — Bazett, Fridericia, Framingham, and Hodges, with sex-specific interpretation.
Open calculator →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.