I built an open‑source, end‑to‑end encrypted messaging web app using Supabase and WebRTC

Description and use

Ripple Chat is an open‑source web app for instant, end‑to‑end encrypted messaging and voice/video calls, running as a PWA and built with Supabase and WebRTC.

Problem

Create a private messaging app that works instantly in the browser without requiring app store downloads.

Outcome

Ripple Chat delivers instant, private messaging and voice/video calling in the browser, with true zero‑knowledge encryption and no reliance on Firebase.

Workflow

• 1. Implement client‑side encryption with ECDH P‑256 + AES‑GCM so private keys never leave the browser.
• 2. Build real‑time messaging, typing indicators, emoji reactions, voice notes, and file attachment handling in the browser.
• 3. Add 1:1 voice and video calling using a peer‑to‑peer WebRTC framework.
• 4. Use Supabase Realtime for messaging and secure signed URLs for media storage, avoiding Firebase.
• 5. Package the app as a PWA so users can install it to their phone’s home screen.

Evidence

We just went live with the first version of Ripple Chat!

Source

True Zero‑Knowledge Privacy: Client‑side encryption using ECDH P‑256 + AES‑GCM. Your private keys never leave your browser context.

Source

Voice & Video Calling: 1:1 voice and video calls powered by a peer‑to‑peer WebRTC framework.

Source

No Firebase: Fully powered by Supabase Realtime and secure signed URLs for media storage.

Source