Supabase Realtime with Flutter — Postgres Changes, Presence, and Broadcast in Practice

Supabase Realtime streams PostgreSQL changes to clients over WebSocket. Combine it with Flutter and you can ship live notifications, "who's online" indicators, and collaborative editing in dozens of lines of code. This guide covers all three channel types — Postgres Changes, Presence, and Broadcast — with production-ready examples. The Three Channel Types Type Use Case Data Source Postgres Changes React to INSERT/UPDATE/DELETE PostgreSQL WAL Broadcast Client-to-client events Realtime server Pres