Auth

Add user sign-up, login, and access control to your app without building it from scratch. Compare 5 tools with verified pricing.

Clerk

clerk.com

Frontend-first authentication with pre-built React components and a 15-minute setup time.

Best for: Next.js and React projects that need fast, polished authentication without building custom UI Free tier up to 10,000 MAUs; Pro $25/month + $0.02/MAU after 10,000
Key Features
  • Drop-in React/Next.js components for sign-in, sign-up, and user management
  • Session management, MFA, social login, and magic links included
  • Native App Router and Pages Router support for Next.js
Limitations
  • Less suitable for complex B2B scenarios requiring SAML SSO or advanced RBAC
  • Per-MAU pricing can scale unexpectedly with viral growth
  • More tightly coupled to React/Next.js ecosystem than framework-agnostic alternatives
Pricing verified March 2026

Supabase Auth

supabase.com/auth

Authentication included with Supabase's backend platform, with 50,000 free MAUs.

Best for: Projects already using Supabase for their database — auth comes included with no additional setup Included in Supabase plans. Free tier includes 50,000 MAUs
Key Features
  • Deep PostgreSQL integration with Row Level Security for database-layer access control
  • Supports social login, magic links, phone auth, and OIDC connections
  • 50,000 free MAUs — significantly more generous than Clerk
Limitations
  • No pre-built React UI components — you build your own sign-in forms
  • Limited SAML/enterprise SSO configuration compared to Auth0
  • Best value only when using Supabase for the database — standalone use is harder to justify
Pricing verified March 2026

Auth0

auth0.com

Enterprise-grade identity platform with SAML SSO, compliance features, and extensive customization.

Best for: SaaS products that need to close enterprise deals requiring SAML SSO and compliance documentation Free tier up to 7,500 MAUs; Essential from $35/month
Key Features
  • SAML SSO, HIPAA compliance, and advanced security policies
  • 12+ extensibility trigger points via Actions
  • Broad support for enterprise identity providers
Limitations
  • Expensive for small projects — costs escalate quickly with user growth
  • Complex setup for seemingly simple features
  • Acquired by Okta, bringing enterprise capabilities but also enterprise complexity
Pricing verified March 2026

Auth.js (NextAuth)

authjs.dev

Open-source authentication library for Next.js and other JavaScript frameworks — free, self-hosted.

Best for: Developers who want full control over authentication and are comfortable handling their own infrastructure Free (open source)
Key Features
  • Supports 50+ providers (Google, GitHub, Discord, and more)
  • No monthly costs — zero vendor dependency
  • Active community and broad framework support
Limitations
  • Requires more wiring than managed solutions — not a 15-minute setup
  • You are responsible for security updates, session management, and infrastructure
  • No managed UI components — everything must be built custom
Pricing verified March 2026

Kinde

kinde.com

Authentication platform built for B2B SaaS with organizations, RBAC, and billing features included.

Best for: B2B SaaS products that need organizational features, roles, and permissions from day one Free tier available; paid plans for advanced features
Key Features
  • Built-in organizational structures, team management, and RBAC
  • Authentication plus billing and feature flags in one platform
  • Designed for production-ready auth without months of integration work
Limitations
  • More complex than needed for simple consumer apps
  • Smaller community and fewer tutorials than Clerk or Auth0
  • Pricing structure less established than market leaders
Pricing verified March 2026

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