March 7, 2026
Pulse check or privacy panic?
Show HN: A weird thing that detects your pulse from the browser video
Your webcam reads your heartbeat — fans cheer, privacy cops panic
TLDR: A browser demo claims it can read your heartbeat via webcam. The crowd split: some saw a neat, simple trick; others bristled at privacy risks, warned of profiling, and found crashes and accuracy issues. It matters because biometric data from your camera could become a powerful—and controversial—new signal.
A new "show and tell" site claims it can read your pulse straight through your webcam, promising: "No one can see you. Only your heart rate is shared." The community immediately split into wow vs whoa. One Android user cheered, “worked for me… love the simplicity,” while a Mac user said turning on the camera crashes their browser repeatedly, turning the demo into a stress test of its own.
The loudest drumbeat? Privacy fear and dystopia drama. One commenter refused to flip their webcam on without a clear privacy statement, noting videos can literally spike your heart rate and recalling a health scare at 39. Another warned this could be used to profile people over video — think hiring managers, landlords, even police — and dropped a skeptical link for emphasis. Cue the meme: “HR wants your HR.”
Accuracy angst also took a victory lap. A tester said it was about 10 beats per minute off and worse at spotting breathing, imagining awkward telehealth calls where your pulse says "Zen" but your face says "Nope." The vibe is classic internet: a clever trick that’s either the future of remote care or the creepiest party trick since auto-muting your mic. For now, the crowd’s pulse is racing — but not always in a good way.
Key Points
- •A web page detects a user’s pulse using the device camera within the browser.
- •The page states: “No one can see you. Only your heart rate is shared.”
- •Interaction appears to be real-time, with the page responding to the user’s pulse.
- •No technical details or methodology are described in the article text.
- •No information is given about accuracy, data handling beyond the privacy claim, or use cases.