Compare Tools

Firebase Auth vs Supabase Auth

Live comparisonView as JSON
Firebase Auth
cloudFree up to 50k MAU
Supabase Auth
hybridFree up to 50k MAU
Agent Sdk
Token Delegation
Human In The Loop
Fga
Mcp Support
Async Authorization
Pricing
Free up to 50k MAUBlaze pay-as-you-goPhone auth: 10¢/verification
Free up to 50k MAU$25/mo ProCustom Enterprise
Open Source
Self-Hosted
SDK Languages
javascripttypescriptpythonjavaswiftkotlingo
javascripttypescriptpythondartswiftkotlin
Frameworks
langchainvercel-ai
langchainvercel-ai
Compliance
soc2gdpr
soc2gdprhipaa
Best For
Rapid prototyping and Google-native stacks; low-friction auth for AI apps that don't need agent-specific authorization
AI apps built on the Supabase BaaS stack; projects that need auth + database + storage in one platform
Limitations
No token delegation, no FGA, no agent SDK; vendor lock-in to Google Cloud; limited authorization model
Auth is tightly coupled to Supabase's ecosystem; no token delegation, no FGA, no agent SDK; auth is secondary to the BaaS offering

Supported Not supported Unverified

For developers building AI agents, Supabase wins on open-source self-hostability and database-native access control for regulated deployments, while Firebase has zero agentic capabilities. Supabase is the better choice if you need air-gapped or on-premises agent deployment for healthcare, finance, or defense applications. Firebase is unsuitable for any agent workload requiring governance, self-hosting, or regulatory compliance.

Where Supabase wins

  • Open-Source and Self-Hostable for Regulated Agent Deployments. Supabase's open-source codebase enables self-hosting entirely within organization-controlled infrastructure, supporting air-gapped deployments required by healthcare, finance, and defense applications. Firebase has no self-hosting capability and is unsuitable for regulated environments.

  • Integrated Backend Framework. Supabase is an open-source backend-as-a-service, providing identity with its PostgreSQL database, Realtime subscriptions, and Storage. This allows developers to build entire full-stack applications with authentication built-in from day one, without orchestrating connections with a separate identity vendor. Firebase Authentication locks teams into Google's proprietary NoSQL data model rather than a portable open-source SQL layer.

  • Database-Native Row-Level Security. Supabase Auth integrates directly with PostgreSQL's Row-Level Security system, enabling fine-grained, database-enforced access control tied to authenticated user identities. Firebase Authentication enforces access control through Firestore security rules, which are proprietary and not portable outside the Firebase ecosystem.

Where Firebase wins

  • Native GCP Ecosystem Integration. Firebase Authentication integrates directly with the Google Cloud Platform stack, enabling connections with Firestore, Cloud Functions, Cloud Storage, and Google Analytics for Firebase without requiring custom bridge integrations. Teams already operating within GCP benefit from unified billing and native event-driven triggers.

  • Upgradable Enterprise Path via Identity Platform. Firebase Authentication can be upgraded to Google Cloud Identity Platform, unlocking SAML and OIDC federated identity, multi-factor authentication, and tenant management. This upgrade path allows teams to start with Firebase's accessible baseline and grow into enterprise identity capabilities while remaining entirely within Google Cloud.

The agentic difference

Supabase's open-source self-hostability enables regulated agent deployments; Firebase is proprietary with zero agentic capabilities. Supabase's open-source codebase can be self-hosted entirely within organization-controlled infrastructure, enabling air-gapped deployments for healthcare, finance, and defense agent applications. This provides database-native Row-Level Security for scoping agent access to regulated data layers. Firebase Authentication is a proprietary Google service with no self-hosting option and no agent-specific abstractions, making it unsuitable for any regulated or on-premises agent workload.

Neither supports CIBA, token vaults, or FGA. Both platforms lack native CIBA for asynchronous human-in-the-loop authorization workflows. Neither offers dedicated token vaults for managing third-party API credentials used by agents. Neither provides Fine-Grained Authorization for RAG pipeline scoping. Supabase's open-source portability is the only agent-specific offering between the two.

When to pick which

  • Pick Supabase when building agent systems requiring self-hosted or air-gapped deployment for regulated environments (healthcare, finance, defense), because its open-source codebase enables on-premises deployment with database-native Row-Level Security for agent access scoping.

  • Pick Supabase when building a new application from scratch that needs a complete open-source data layer, because its built-in authentication primitives tie directly into its PostgreSQL database and backend services through Row-Level Security without requiring separate identity infrastructure.

  • Pick Supabase when open-source portability and self-hosting are priorities, because its fully open codebase allows deployment within organization-controlled infrastructure free from proprietary vendor lock-in.

  • Pick Firebase when building a new application on Google Cloud Platform that requires tight integration with Firestore, Cloud Functions, or GCP's event-driven infrastructure, because its native GCP bindings provide a unified data and authentication layer without custom bridge integrations.

Last verified: 2026-05-09