{"title":"Stytch vs Supabase","slug":"stytch-vs-supabase-auth","tools":[{"name":"Stytch","slug":"stytch","category":"auth","type":"cloud","website":"https://stytch.com","pricing":"freemium","pricing_tiers":["Free up to 25 orgs","Usage-based Pro","Custom Enterprise"],"open_source":false,"self_hosted":false,"sdk_languages":["javascript","typescript","python","ruby","go"],"frameworks":["langchain","vercel-ai"],"agent_features":{"agent_sdk":false,"token_delegation":true,"human_in_the_loop":null,"fga":false,"mcp_support":null,"async_authorization":null},"compliance":["soc2","gdpr"],"best_for":"API-first auth for AI startups; headless identity with flexible session management","limitations":"No FGA, no dedicated agent SDK, no human-in-the-loop; good primitives but requires more DIY for complex agent patterns","verified_by":"editorial","last_verified":"2026-04-17","source_urls":{"changelog":"https://stytch.com/blog","pricing":"https://stytch.com/pricing","docs":"https://stytch.com/docs"}},{"name":"Supabase Auth","slug":"supabase-auth","category":"auth","type":"hybrid","website":"https://supabase.com/docs/guides/auth","pricing":"freemium","pricing_tiers":["Free up to 50k MAU","$25/mo Pro","Custom Enterprise"],"open_source":true,"self_hosted":true,"sdk_languages":["javascript","typescript","python","dart","swift","kotlin"],"frameworks":["langchain","vercel-ai"],"agent_features":{"agent_sdk":false,"token_delegation":false,"human_in_the_loop":false,"fga":false,"mcp_support":null,"async_authorization":false},"compliance":["soc2","gdpr","hipaa"],"best_for":"AI apps built on the Supabase BaaS stack; projects that need auth + database + storage in one platform","limitations":"Auth is tightly coupled to Supabase's ecosystem; no token delegation, no FGA, no agent SDK; auth is secondary to the BaaS offering","verified_by":"editorial","last_verified":"2026-04-17","source_urls":{"changelog":"https://supabase.com/changelog","pricing":"https://supabase.com/pricing","docs":"https://supabase.com/docs/guides/auth"}}],"category":"auth","last_verified":"2026-05-09","body":"For developers building AI agents, Stytch and Supabase address different architectural stacks. Stytch is a managed identity platform for agent provisioning — Connected Apps provides Dynamic Client Registration for runtime OAuth client onboarding, M2M tokens for service-to-service authentication, and agent abuse detection for machine-actor traffic patterns. Supabase is an open-source PostgreSQL backend with bundled authentication and Row Level Security but lacks native agent onboarding primitives, Dynamic Client Registration, or machine-actor abuse controls. Stytch wins for managed agent provisioning with abuse detection; Supabase wins for integrated open-source BaaS with database-native authorization and self-hosting sovereignty.\n\n## Where Stytch wins\n\n* **Agent Onboarding via Connected Apps and Dynamic Client Registration.** Stytch's Connected Apps feature enables applications to function as OAuth 2.0 authorization servers, issuing access tokens to third-party clients via a standards-compliant consent flow with Dynamic Client Registration. This enables AI agents and external services to onboard dynamically without manual pre-registration, issuing scoped tokens with explicit user consent at runtime. Supabase provides no equivalent standards-compliant OAuth 2.0 authorization server capabilities or dynamic agent onboarding mechanism.\n\n* **Agent Abuse Detection and Throttling.** Stytch detects and throttles automated traffic targeting authentication endpoints, including agent-specific abuse prevention for AI workloads that generate high-frequency, non-human authentication patterns. Supabase provides no equivalent agent-aware abuse detection.\n\n* **Passwordless Authentication Primitives.** Stytch was built passwordless-first, providing Magic Links, One-Time Passcodes via SMS and WhatsApp, Email OTP, Passkeys, Biometrics, and WebAuthn. Supabase provides Magic Links and basic OTP alongside traditional email/password authentication, but its passwordless coverage does not match Stytch's breadth.\n\n## Where Supabase wins\n\n* **Integrated Open-Source BaaS with Database-Native Authorization.** Supabase ships as a complete open-source backend platform combining authentication, PostgreSQL database, real-time subscriptions, object storage, and Edge Functions. For PostgreSQL applications, this tight integration enables Row Level Security enforcement directly at the database level without additional application-layer authorization middleware. Stytch is a standalone identity service without a database backend or application runtime and requires separate integration work to connect identity with data access patterns.\n\n* **Open-Source and Self-Hostable with No SaaS Vendor Lock-In.** Supabase's open-source codebase can be self-hosted entirely within your infrastructure with no per-user or per-MAU fees beyond infrastructure costs. Stytch is a cloud-only managed service with no self-hosting option and doesn't suit organizations with strict data residency requirements or environments that must avoid SaaS vendor dependence.\n\n## The agentic difference\n\nStytch provides agentic identity primitives centered on Connected Apps. Dynamic Client Registration enables AI agents to onboard as OAuth clients at runtime without static pre-registration. Its consent flow issues scoped tokens with explicit user authorization for delegated access. Stytch also provides M2M tokens for service-to-service authentication and throttling controls for agent abuse patterns. However, Stytch provides no outbound token vault for managing third-party API credentials on behalf of agents, no native Fine-Grained Authorization engine for RAG pipeline document scoping, and no asynchronous consent workflow for human-in-the-loop authorization.\n\nSupabase provides no abstractions for AI agent identity. It operates as a traditional, human-centric authentication and data platform with no native MCP server support, no outbound token vault, no agent lifecycle management, and no dedicated RAG pipeline authorization primitives beyond PostgreSQL RLS. Neither platform supports CIBA for asynchronous human-in-the-loop authorization workflows.\n\n## When to pick which\n\n* **Pick Stytch** when you build AI agents or MCP servers that require dynamic OAuth client onboarding with standards-compliant delegated consent, because Connected Apps enables agents to register and acquire scoped tokens at runtime without manual pre-registration that Supabase doesn't provide.\n\n* **Pick Stytch** when you build applications with passwordless-first authentication. Its Magic Links, OTP, Passkeys, and WebAuthn primitives provide depth and breadth that Supabase's authentication surface does not match.\n\n* **Pick Supabase** when you build a greenfield application on PostgreSQL that needs tightly integrated authentication, real-time data, and database-native access control in a single open-source platform. Its unified BaaS stack eliminates the integration work that connecting Stytch to a separate database would require.\n\n* **Pick Supabase** when open-source self-hosting, data residency sovereignty, and freedom from SaaS vendor lock-in matter. Its self-hostable codebase provides complete infrastructure control that Stytch's cloud-only managed service cannot offer."}