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4.  Auth0 

![Auth0 company logo](https://www.google.com/s2/favicons?sz=128&domain=auth0.com)

# Auth0

Featured 

Auth0 is a developer-centric customer identity and access management (CIAM) platform offering authentication, authorization, and user management for web and mobile applications, now operating as Okta Customer Identity Cloud.

Last updated 3 months ago

[Visit site](https://auth0.com)

Quick answer

## What is Auth0?

Short answer

Auth0 was acquired by Okta in 2021 and now operates as Okta Customer Identity Cloud. It remains a largely independent product with its own developer experience, documentation, and roadmap. Auth0 is best known for its extensive SDK library (covering 30+ languages and frameworks), its Universal Login hosted authentication page, and its flexible Rules/Actions system for customizing authentication pipelines. It supports social login, enterprise SSO (SAML, OIDC), MFA, machine-to-machine authentication, and CIAM use cases. Auth0 uses MAU-based pricing with feature tiers. Verify current pricing and roadmap direction with Okta/Auth0 directly.

Best for

Development teams building web and mobile applications that need feature-rich, standards-compliant authentication with minimal identity infrastructure overhead. Particularly strong for applications requiring both consumer authentication (social login, passwordless) and enterprise authentication (SAML SSO, SCIM).

When to choose

Choose Auth0 when your primary need is customer-facing authentication for a web or mobile application, you want extensive SDK coverage and best-in-class documentation, and your team wants to move quickly without managing identity infrastructure. Strong choice for B2B SaaS products needing both consumer and enterprise authentication in one platform.

When not to choose

Avoid Auth0 if you need self-hosted deployment, have concerns about Okta's long-term product consolidation plans, are at a scale where MAU-based pricing is prohibitive, or primarily need workforce IAM rather than CIAM.

Related tools & categories

[Customer Identity / CIAM](/directory/category/ciam)[SSO](/directory/category/sso)[MFA / Passwordless](/directory/category/mfa)[Zitadel](/directory/zitadel)[Stytch](/directory/stytch)[Run the IAM Stack Finder](/stack-finder)[Report: The State of AI Agent Identity 2026](/reports/state-of-ai-agent-identity-2026)

## Categories

[Customer Identity / CIAM ★](/directory/category/ciam)[SSO](/directory/category/sso)[MFA / Passwordless](/directory/category/mfa)[Developer Authentication](/directory/category/developer-auth)

## Common use cases

-   Consumer authentication with social login (Google, Facebook, Apple, GitHub, etc.) 
-   Enterprise SSO connections for B2B SaaS products using SAML and OIDC 
-   Passwordless authentication via magic links, OTPs, and passkeys 
-   Machine-to-machine (M2M) authentication using OAuth 2.0 Client Credentials 
-   Fine-grained authorization using Auth0's FGA (Fine-Grained Authorization) 
-   Multi-tenant application architecture with organization management 

## Strengths

-   SDK coverage for 30+ languages and frameworks — one of the broadest in the CIAM market 
-   Excellent documentation quality, regularly cited as best-in-class among developers 
-   Flexible Actions/Rules pipeline for customizing authentication and token issuance 
-   Universal Login provides a polished, customizable hosted authentication experience 
-   Broad protocol support: OIDC, SAML 2.0, OAuth 2.0, LDAP, WS-Federation 
-   Strong enterprise connection catalog for B2B SSO scenarios 

## Limitations & considerations

-   MAU-based pricing can become expensive at scale, particularly for consumer apps with large registered user bases 
-   The Rules/Actions customization system, while powerful, has a documented learning curve 
-   Post-Okta acquisition has raised questions for some customers about product roadmap consolidation — verify current direction with Okta 
-   No self-hosted deployment option — SaaS only 
-   Some advanced features (custom domains, custom rate limits, SLA guarantees) require higher-tier or enterprise plans 

## Pricing model summary

Auth0 uses MAU-based (monthly active users) pricing with tiered feature sets. Free tier available with MAU limits (verify current limits at auth0.com). Machine-to-machine tokens are priced separately from MAU. Enterprise plans provide custom rate limits, SLA guarantees, and dedicated support. Verify current pricing at auth0.com/pricing.

[View vendor pricing page ↗](https://auth0.com/pricing)

## Integrations

Google Facebook GitHub Salesforce Twilio SendGrid Stripe Segment AWS Azure AD 

## Fit

Company size

Startup, Mid-market, Enterprise

Deployment

SaaS / Cloud-hosted

Source

Proprietary

Pricing model

MAU-based (monthly active users); M2M tokens priced separately; enterprise plans available

## Alternatives & comparisons

[Zitadel](/directory/zitadel)

Open source identity and access platform with built-in multi-tenancy, SSO, MFA and a managed Zitadel Cloud SaaS.

[Compare Auth0 vs Zitadel →](/compare/auth0-vs-zitadel)

[Stytch](/directory/stytch)

Stytch is an API-first authentication platform offering passwordless authentication (magic links, OTPs, passkeys), session management, and B2B organization management with a clean, headless developer experience.

[Compare Auth0 vs Stytch →](/compare/auth0-vs-stytch)

[WorkOS](/directory/workos)

WorkOS provides a developer API for adding enterprise identity features — SSO, SCIM directory sync, audit logs, and admin portals — to B2B SaaS applications, enabling faster enterprise sales readiness.

[Compare Auth0 vs WorkOS →](/compare/auth0-vs-workos)

[Clerk](/directory/clerk)

Clerk provides drop-in authentication UI components and a complete user management platform for React, Next.js, and modern web applications, including B2B organization management and enterprise SSO.

[Compare Auth0 vs Clerk →](/compare/auth0-vs-clerk)

[FusionAuth](/directory/fusionauth)

FusionAuth is a comprehensive authentication and user management platform offering flexible deployment (self-hosted, private cloud, or FusionAuth Cloud), developer-friendly APIs, and broad feature coverage including SSO, MFA, SAML, OIDC, and multi-tenancy.

[Compare Auth0 vs FusionAuth →](/compare/auth0-vs-fusionauth)

IDSync provides educational buyer guidance based on publicly available information, editorial review, and user-submitted data. Vendor information should be verified before purchase. [Who we are, our methodology & disclosure policy](/about).

Auth0 and its logo are trademarks of their respective owner. IDSync is an independent buyer resource and does not imply endorsement unless explicitly stated.

### Take action

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