Better Auth vs Supabase Auth

Sources verified 2026-10-05 · Sources (10)

Both provide authentication, but the integration boundary differs. Better Auth fits auth into your TypeScript backend; Supabase Auth connects identity and JWT sessions to Supabase's Postgres and data APIs.

Verdict

Choose by where data authorization will run and who operates authentication. Better Auth suits a backend you control; Supabase Auth suits identity integrated with Supabase's data layer. Skip browser-to-database access until grants and RLS are tested, and keep secret/service-role keys on trusted servers. Migrating users and active sessions needs its own plan.

Pick Better Auth when

Your TypeScript backend already owns data access and you need configurable auth alongside it
The organization/plugin model fits and you can operate the auth service and database-backed schema

Skip Better Auth if

you need a managed auth service and cannot operate the library's backend and database-backed schema.

Pick Supabase Auth when

Your app already uses Supabase and identity should feed its tested Data API and row policies
You want the hosted auth service, while owning application permissions and SSR cookie handling

Skip Supabase Auth if

you need organization management that you cannot implement and test with application membership tables and policies.

Better AuthOpen source

TypeScript auth library

Supabase AuthOpen source

Authentication server and Supabase service

Related playbooks

What actually differs

Better AuthSupabase Auth

DeploymentBetter Auth: A library in your backend, with supported database adapters and pluginsSupabase Auth: Use the hosted Supabase service or operate the open-source auth server yourself

Identity and sessionsBetter Auth: Database-backed auth tables and cookie sessions, with optional caching or stateless configurationsSupabase Auth: Auth records in a Postgres schema and JWTs sent through client SDKs or APIs

Application data accessBetter Auth: Your server verifies sessions and authorizes queries; adding the library does not create row policiesSupabase Auth: Auth tokens integrate with Data API requests; you write and test grants and RLS policies for exposed tables

Organizations and permissionsBetter Auth: The organization plugin provides membership, invitation, and access-control building blocksSupabase Auth: Model application memberships and permissions in your schema and enforce them in RLS or trusted server code

Operations and licenseBetter Auth: MIT core; you maintain endpoints, database migrations, email delivery, and upgradesSupabase Auth: MIT auth server; hosted service costs and limits are separate, while self-hosting makes operations yours

Sources

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