Supabase Realtime

Postgres-backed realtime channels

Free tier + paidRealtime, comments & collabsupabase.com

What it is

The realtime layer bundled with Supabase, offering three modes: Broadcast for ephemeral pub/sub, Presence for who-is-online state, and Postgres Changes for streaming row-level inserts, updates and deletes directly off the database write-ahead log. Row Level Security policies govern the realtime stream as well as the table.

Why it earns a slot

If your content already lives in Supabase Postgres, live comments cost one postgres_changes subscription and no extra vendor. The same RLS policy that protects the table protects the socket, which removes a whole class of auth bugs.

Know before you commit

Postgres Changes does not scale like dedicated pub/sub — Supabase itself steers high-throughput use toward Broadcast, since every change is authorised and filtered per connection. Limits are on peak concurrent connections, so one spike bills even when average usage is tiny.

Getting started

npm i @supabase/supabase-js

Field notes

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Pricing snapshot

Free: 200 concurrent peak connections, 2M messages/mo, 256 KB max message size. Pro $25/mo: 500 connections then $10 per 1,000, 5M messages then $2.50 per million, 3 MB messages. Team $599/mo. Self-hostable

Snapshots move fast — verify at checkout, and post a field note if it changed.

Drop into your Lovable chat

Evaluate Supabase Realtime (https://supabase.com/realtime) for this project, then use it only if it fits what we are already building.
Context: Postgres-backed realtime channels. The realtime layer bundled with Supabase, offering three modes: Broadcast for ephemeral pub/sub, Presence for who-is-online state, and Postgres Changes for streaming row-level inserts, updates and deletes directly off the database write-ahead log. Row Level Security policies govern the realtime stream as well as the table.
Reviewer notes (general, not written for this codebase): If your content already lives in Supabase Postgres, live comments cost one postgres_changes subscription and no extra vendor. The same RLS policy that protects the table protects the socket, which removes a whole class of auth bugs.
Watch out for: Postgres Changes does not scale like dedicated pub/sub — Supabase itself steers high-throughput use toward Broadcast, since every change is authorised and filtered per connection. Limits are on peak concurrent connections, so one spike bills even when average usage is tiny.
Pricing: Free: 200 concurrent peak connections, 2M messages/mo, 256 KB max message size. Pro $25/mo: 500 connections then $10 per 1,000, 5M messages then $2.50 per million, 3 MB messages. Team $599/mo. Self-hostable
Setup: npm i @supabase/supabase-js
Rules: treat the notes above as background only. Do not assume a theme, style, layout or feature that is not already in this project — inspect the existing code first and ask me before changing visual direction.

/api/public/tools/supabase-realtime

Neighbourhood

How Supabase Realtime sits against the rest of the atlas — swaps, companions and the tools builders actually save alongside it.

Instead of thisGiscus PartyKit Socket.IO Yjs Ably Agora Chatwoot Circle

Named in the wiringStream Supabase

Also in Realtime, comments & collab

Ably

ably.com

Realtime messaging platform

Free tier + paidRealtime, comments & collab

Free: 6M messages/mo, 200 concurrent connections, 200 channels, 500 msg/sec. Standard $29/mo plus usage (10k connections, 10k channels); Pro $399/mo plus usage (50k). Usage: $2.50 per million messages, $1.00 per million connection-minutes, $0.25/GiB transfer

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Agora

agora.io

Metered RTC voice and video API

Free tier + paidRealtime, comments & collab

Free monthly: 10,000 combined RTC minutes, 1M signaling messages, 500 chat users, 300 conversational AI minutes. RTC $0.59 per 1,000 minutes; recording $0.99 per 1,000; speech-to-text $16.99 per 1,000; real-time translation $8.99 per 1,000 per language. Analytics add-on from $449/mo

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Chatwoot

chatwoot.com

Open-source support inbox + chat

Free tier + paidRealtime, comments & collab

Self-host free under the MIT licence. Cloud Hacker $0 (2 agents, 500 conversations/mo, live chat only, 30-day retention); Startups $19/agent/mo annual; Business $39/agent/mo; Enterprise $99/agent/mo. Extra Captain AI credits $20 per 1,000

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Circle

circle.so

Hosted community and courses

PaidRealtime, comments & collab

Professional $89/mo (3 admin seats, 2% transaction fee, 200 GB); Business $199/mo (5 seats, 1% fee, 500 GB); Circle Plus custom (unlimited seats, 0.5% fee, 1 TB). Unlimited members on every plan. 14-day trial, no permanent free plan

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