Skip to main content
Back to Tools
Auth0

Auth0

Secure authentication and authorization for apps, APIs, and AI agents

Authentication Platform
Backend-as-a-Service (BaaS)
Cybersecurity & Security AI
Starting from
Free
Free trial available
Try Auth0View full pricing
Is this your tool? Claim it

AI-Powered Summary

Auth0 is a customer identity and access management (CIAM) platform owned by Okta that provides authentication, authorization, and user management for web, mobile, and API applications. It serves developers building B2B SaaS products, consumer-facing applications, and AI agent-powered tools, offering features like Universal Login, SSO, MFA, passwordless authentication, and fine-grained authorization with extensive SDK support across 30+ frameworks and languages.

Key Features

What makes Auth0 stand out

Universal Login

A customizable, centralized login page that supports SSO, social login, passwordless, and MFA across all your apps.

Single Sign-On

Let users log in once and access multiple applications without re-entering credentials.

Multi-Factor Authentication

Add extra security layers using SMS, email, security keys, or biometrics for login verification.

AI Agent Authentication

Secure AI agents with user authentication, Token Vault for API access control, and fine-grained authorization for RAG pipelines.

Fine-Grained Authorization

Define detailed access control rules to determine exactly who can access what resources within your application.

Token Vault

Manage and store third-party API tokens so AI agents and apps can securely call APIs on behalf of users.

Actions & Forms

Customize and extend authentication flows with serverless code (Actions) and drag-and-drop forms.

Bot Detection

Automatically detect and block bot traffic and credential stuffing attacks at the login page.

What's Great

  • Generous free tier supporting up to 25,000 external active users with core features included
  • Extensive SDK and quickstart library covering 30+ languages and frameworks for fast integration
  • Dedicated AI agent authentication capabilities including Token Vault and async authorization for emerging use cases
  • 99.99% uptime SLA with 10 billion+ monthly authentications demonstrating proven scale
  • Customizable Universal Login with no-code and code-based options for branding

Things to Know

  • Paid tier pricing is not publicly transparent — requires contacting sales or signing up to see actual costs
  • Enterprise features like Self-Service SSO and Long Lived Sessions are locked to higher tiers
  • Action and Form limits on lower tiers (5 on Free, 10 on Essentials) can be restrictive for complex auth flows
  • Being part of the Okta ecosystem may create vendor lock-in concerns for some organizations

Pricing Plans

All Auth0 pricing tiers and features

Pricing based on External Active Users with custom tiers available on paid plans

Free

Free
External Active Users25,000users
Machine-to-Machine Tokens1,000tokens
Enterprise Connections1connections
Organizations5organizations
Actions + Forms5actions/forms
Token Vault2connections
External Active Users(Up to 25,000)
Machine-to-Machine Authentication(1,000)
M2M Add-on
Passwordless
Social Connections(Unlimited)
Custom Social Connections
Passkeys
Auth0 Database Connection

+12 more features

Essentials

Custom
Machine-to-Machine Tokens1,000tokens
Organizations10organizations
Actions + Forms10actions/forms
Token Vault3 + Add-onconnections
External Active Users(Custom Tiers Available)
Machine-to-Machine Authentication(1,000)
M2M Add-on
Passwordless
Social Connections(Unlimited)
Custom Social Connections
Passkeys
Enterprise Connections(Custom Tiers Available)

+6 more features

Professional

Custom
Machine-to-Machine Tokens5,000tokens
Organizations10organizations
Actions + Forms15actions/forms
Token Vault3 + Add-onconnections
External Active Users(Custom Tiers Available)
Machine-to-Machine Authentication(5,000)
M2M Add-on
Passwordless
Social Connections(Unlimited)
Enterprise Connections(Custom Tiers Available)
Inbound SCIM
Organizations(10)

+5 more features

Enterprise

Enterprise

Contact Sales
Machine-to-Machine Tokens5,000tokens
Actions + Forms30 + Add-onactions/forms
Token Vault4 + Add-onconnections
External Active Users(Custom Tiers Available)
Machine-to-Machine Authentication(5,000)
M2M Add-on
Passwordless
Social Connections(Unlimited)
Enterprise Connections(Custom Tiers Available)
Organizations(Custom Tiers Available)
Self-Service SSO(Select Enterprise Plans)

+7 more features

View full pricing details

Real Cost Breakdown

Hidden Costs

  • Paid tier pricing is not publicly disclosed — requires sales contact
  • Add-ons required for CIBA, additional M2M tokens, extra Actions/Forms, and Token Vault expansions
  • Enterprise connections beyond the included 1 on Free tier require paid plans
  • Token Vault connections are limited per tier with add-on costs for more

Cost Saving Tips

  • The free tier is generous at 25,000 external active users — many startups can operate on it for a long time
  • Auth0 offers a free 1-year startup program for qualifying companies
  • Nonprofits can access special pricing through the Auth0 for Nonprofits program
  • SSO and enterprise connections are now included free, reducing what used to be premium feature costs

Auth0's free tier is one of the most generous in the authentication space at 25,000 users, but paid plan costs are opaque and require contacting sales, making budget planning difficult for growing teams.

Price Comparison

Compare Auth0 with similar tools

Auth0 ranks as the 5th most affordable option out of 5 tools, priced 100% below the category average of $82/mo.

Auth0
Auth0YOU
freemium
Free
LoginRadius
LoginRadius
freemium
$13
/month
Supabase
Supabase
freemium
$25
/month
Memberstack
Memberstack
freemium
$25
/month
hCaptcha
hCaptcha
freemium
$99
/month
Twilio
Twilio
freemium
$250
/month
Bar length shows relative price — longer bars mean higher prices. Tools are sorted from most affordable to most expensive.
Free / Open Source
Freemium
Paid
Enterprise

Best For

Development teams needing production-ready authentication for web and mobile apps

Who Should NOT Use This

  • Teams needing fully on-premise or air-gapped authentication — Auth0 is a cloud-based SaaS platform and does not offer self-hosted deployment options for most customers.
  • Organizations with very simple internal apps and small user counts — Auth0's feature richness and learning curve may be overkill when a basic username/password system or a simpler library would suffice.
  • Developers wanting full visibility into pricing before committing — Paid plan pricing is not publicly listed — you must contact sales or go through signup to get actual costs beyond the free tier.
  • Organizations already deeply invested in a competing identity platform like AWS Cognito or Firebase Auth — Migration costs and SDK changes may outweigh the benefits unless there are specific feature gaps in the existing platform.

Competitive Position

Auth0 uniquely combines mature CIAM capabilities with dedicated AI agent authentication features (Token Vault, async authorization, FGA for RAG) under a single platform backed by Okta's scale.

When to Choose Auth0

  • When you need to ship authentication quickly with extensive SDK support across many frameworks
  • When building B2B SaaS that requires multi-tenant organizations with SSO and SCIM
  • When building AI agent-powered applications that need secure third-party API token management
  • When you want a high free-tier user limit (25,000) to grow before paying

When to Look Elsewhere

  • When you need fully transparent, publicly listed pricing for budget approvals
  • When building purely internal/workforce identity — Okta's core product or Azure AD may be more appropriate
  • When you need a fully open-source, self-hosted solution — Keycloak or Ory would be better
  • When your app is entirely within the AWS ecosystem — AWS Cognito may integrate more naturally

Strongest alternative: Clerk

Learning Curve

Moderate
Time to basic use
30 minutes to 2 hours
Time to proficiency
1-3 weeks

Prerequisites

Basic understanding of web application development
Familiarity with OAuth 2.0 and OpenID Connect concepts
Proficiency in at least one supported programming language or framework

Common Challenges

  • Understanding the difference between Auth0 tenants, applications, APIs, and connections
  • Configuring Actions and Forms for custom authentication flows beyond basic login
  • Setting up enterprise connections and multi-tenancy with Organizations for B2B use cases
  • Managing token lifetimes, refresh tokens, and session management correctly

Frequently Asked Questions

Common questions about Auth0

Ready to try Auth0?

Join thousands of users who are already using Auth0 to supercharge their workflow.

Get Started Free