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About Auth0
Auth0 is a flexible identity-as-a-service platform that handles the entire authentication stack, so developers don't have to build login systems from scratch. It provides pre-built login pages, APIs, and SDKs for web, mobile, native apps, and AI agents, supporting social logins (Google, Facebook, Apple), enterprise SSO (SAML, OIDC), passwordless login, and multi-factor authentication.
What it does
With a few lines of code, developers configure authentication rules via a dashboard or API, and Auth0 manages user sessions, token issuance, and security policies. It also includes user management, anomaly detection, breached password monitoring, and bot detection—powering over 10 billion authentications monthly with 99.99% uptime.
Who it is for
Auth0 is best for startups needing fast authentication without security expertise, enterprise teams requiring SSO and compliance (SOC 2, HIPAA, GDPR), and developers building multi-tenant SaaS apps with custom auth flows. It secures AI agents, B2B tools, and B2C apps alike.
Real use cases
Use Auth0 to add single sign-on to an internal dashboard, enable passwordless login for a mobile app, orchestrate tailored customer journeys with adaptive MFA, or secure an AI agent's access to user APIs via Token Vault. It integrates in just 5 minutes with 30+ SDKs and Quickstarts.
Key features
- Universal Login — Pre-built, customizable login pages for web and mobile
- Social login — 30+ providers including Google, Facebook, Apple, GitHub
- Enterprise SSO — SAML, OIDC, LDAP, and Active Directory integration
- Multi-factor authentication — TOTP, SMS, push notifications, and biometrics
- Passwordless — Email magic links, SMS codes, or one-time passwords
- User management dashboard — Search, filter, and manage users with roles and permissions
- Anomaly detection — Brute-force protection, breached password detection, and suspicious login alerts
Auth0 Pricing
Auth0 pricing: Free · from $35/mo. Billing model: Freemium.
Free — $0/month
Up to 25,000 monthly active users. Includes 1 Custom Domain, Passwordless Authentication, Unlimited Social Connections, 5 Organizations, Brand Customization, Basic Attack Protection, Community Support, 1 Enterprise Connection, Self-Service SSO, and SCIM. No credit card needed.
Essentials — $35/month
Up to 500 monthly active users. Everything in Free, plus Pro Multi-Factor Authentication, Role-based Access Control, 10 Organizations, Audit Log Streaming (Datadog, Splunk, AWS, Azure), and Standard Support.
Professional — $240/month
Up to 500 monthly active users. Everything in Essentials, plus Enterprise Multi-Factor Authentication, use your existing User Database for Logins, Enhanced Attack Protection, and M2M Tokens.
Enterprise — Contact for pricing
Top-tier SLAs, advanced security, white-glove support. Includes custom User & SSO tiers, 99.99% SLA, Enterprise Rate Limits, Private Deployment options, and more.
All plans include a free trial. No credit card required to start.
Frequently asked questions
Is Auth0 free?
Yes, Auth0 offers a Free plan for up to 25,000 monthly active users with no credit card required. Includes social logins, passwordless, and basic attack protection.
How much does Auth0 cost?
Auth0 pricing starts at Free ($0/month). Paid plans begin at $35/month (Essentials, up to 500 MAU) and $240/month (Professional, up to 500 MAU). Enterprise plans are custom-priced.
What is Auth0 used for?
Auth0 is used to add authentication and authorization to web, mobile, and AI agent apps. It provides login, SSO, MFA, and user management—without building from scratch.
Who is Auth0 best for?
Auth0 is best for startups, enterprise teams needing SSO/compliance, and developers building multi-tenant SaaS apps or securing AI agents.
What are the top alternatives to Auth0?
Top alternatives include Okta (its parent company), Firebase Authentication, Amazon Cognito, and Clerk. Each varies in pricing, features, and deployment flexibility.
Does Auth0 support AI agents?
Yes, Auth0 offers Token Vault, Fine-Grained Authorization for RAG, and M2M authentication specifically for securing AI agents and MCP servers.
