Tool profile
Authentication service for apps with sign-in, user management, and database-connected auth flows.
Supabase-backed apps that want auth without a separate user store
Postgres-native auth: JWTs, Row Level Security hooks, and social/magic-link flows that live beside your Supabase database.
supabase.com/docs/guides/platform/billing-on-supabase (March 2026) publishes organization-level quotas: Monthly Active Users include 50,000 MAU on the Free plan and 100,000 MAU included on Pro/Team, with usage beyond those envelopes billed per the Manage your usage guides. Third-party and SSO MAU rows have their own included amounts. Auth does not invoice separately from the Supabase subscription—you upgrade the organization plan and add-ons (compute, disk, etc.) as needed.
SMS, custom SMTP, and enterprise SSO features may add pass-through costs or higher plan requirements—verify in dashboard settings before launch.
Quick fit
Editorial take
Supabase Auth is easy to under-budget because it sits inside the larger platform bill. Reconcile Supabase's Auth MAU definition with your own analytics definitions before promising that users are still inside the free tier.
What it does well
Primary use cases
Fit notes
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Pricing snapshot
Supabase Auth is bundled into the platform plans rather than sold as a standalone product. The Free plan includes 50,000 monthly active users, while paid plans such as Pro include 100,000 MAUs before Auth overage billing begins. Supabase also separates monthly active third-party users and monthly active SSO users into their own usage categories in the billing docs.
Auth0
Free planB2B SaaS selling into buyers expecting SAML, SCIM, and audit evidence
Identity platform for adding authentication, user management, SSO, and access control to apps.
Free: 25k MAU; Essentials/Professional self-serve: 500 MAU on public 2026 cards—confirm before budgeting.
