Show HN: KGBaby – A WebRTC based audio baby monitor I built on pat leave
legodud3 Thursday, February 19, 2026Baby monitors are a great boon. We use the audio-only Motorola AM21, which is excellent. But being on pat leave with a 2-month-old right now, I decided to build a browser-based alternative using WebRTC and some AI coding agents (Codex & Gemini).
It is an open-source, zero-latency P2P monitor. Hardware reuse: You can repurpose an old phone or tablet to be the child unit instead of buying single-purpose hardware. Actually private: Unlike using a never-ending Google Meet or Zoom, your stream stays private via WebRTC (PeerJS for signaling). No cloud routing. The backgrounding hack: Mobile Safari aggressively kills background audio. I used a hidden 1x1 base64 looping video to keep the microphone active when the screen dims.
Links: Live Demo: https://legodud3.github.io/kgbaby/ Repo: https://github.com/legodud3/kgbaby
Welcome all feedback!