Show HN: Browser-based rPPG – webcam to heart rate with no server, just signals (opens in new tab)

Built a fully client-side remote photoplethysmography pipeline. Everything runs in the browser — MediaPipe FaceMesh for landmarks, ROI sampling from forehead/cheek regions, POS pulse extraction, FFT to get BPM. No backend, no inference server.

Also built a step-by-step learn view that replays a saved session so you can inspect each stage of the pipeline.

Demo: https://rppg-azure.vercel.app

Repo: https://github.com/Shaivpidadi/rPPG

Not a medical device — educational demo of how the method works.