Supabase Has a Free Realtime Database — Build Apps with Instant Subscriptions

Supabase Realtime lets you listen to database changes in real-time — build collaborative apps, live dashboards, and chat features without WebSocket infrastructure.

What You Get for Free

• Postgres Changes — subscribe to INSERT, UPDATE, DELETE on any table
• Broadcast — send messages to connected clients (chat, cursors)
• Presence — track who's online in real-time
• Row-Level Security — only receive changes you're authorized to see
• Client SDKs — JavaScript, Flutter, Swift, Kotlin
• Free tier — 500 concurrent connections, 2GB database

Quick Start

import { createClient } from '@supabase/supabase-js'

const supabase = createClient(SUPABASE_URL, SUPABASE_KEY)

// Listen to new messages in real-time
supabase
  .channel('messages')
  .on('postgres_changes',
    { event: 'INSERT', schema: 'public', table: 'messages' },
    (payload) => console.log('New message:', payload.new)
  )
  .subscribe()

Why Developers Switch from Firebase Realtime

Firebase uses a proprietary NoSQL database with its own query language:

• Real PostgreSQL — use SQL, joins, indexes, extensions
• Row-Level Security — Postgres policies, not Firebase rules
• Self-hostable — run on your own server if needed
• SQL migrations — version control your schema

A team built a live dashboard with Firebase but hit query limitations (no joins, no aggregations). After Supabase Realtime: same live updates, full SQL power, complex queries that Firebase couldn't do.

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