Supabase Auth

Postgres-native auth

Free tier + paidAuth & user managementsupabase.com

What it is

Authentication built into the Supabase Postgres platform. Users live in an auth.users table inside your own database, and row-level security policies read the JWT directly. The free tier covers 50,000 monthly active users; the $25/mo Pro plan includes 100,000 then charges $0.00325 per extra MAU.

Why it earns a slot

If your data already sits in Supabase, auth is effectively free and authorization becomes a SQL policy instead of application middleware you have to remember to apply.

Know before you commit

Per-MAU overage is the cheapest in this list, but SAML SSO is billed separately at $0.015/MAU. Free projects pause after a week of inactivity, and misconfigured row-level security is a common route to leaking a whole table publicly.

Getting started

npm i @supabase/supabase-js

Field notes

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Pricing snapshot

Free to 50k MAU · Pro $25/mo incl. 100k then $0.00325/MAU

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

Drop into your Lovable chat

Evaluate Supabase Auth (https://supabase.com/auth) for this project, then use it only if it fits what we are already building.
Context: Postgres-native auth. Authentication built into the Supabase Postgres platform. Users live in an auth.users table inside your own database, and row-level security policies read the JWT directly. The free tier covers 50,000 monthly active users; the $25/mo Pro plan includes 100,000 then charges $0.00325 per extra MAU.
Reviewer notes (general, not written for this codebase): If your data already sits in Supabase, auth is effectively free and authorization becomes a SQL policy instead of application middleware you have to remember to apply.
Watch out for: Per-MAU overage is the cheapest in this list, but SAML SSO is billed separately at $0.015/MAU. Free projects pause after a week of inactivity, and misconfigured row-level security is a common route to leaking a whole table publicly.
Pricing: Free to 50k MAU · Pro $25/mo incl. 100k then $0.00325/MAU
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-auth

Neighbourhood

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