| Attribute |  Auth0Other license |  ClerkOther license |  FusionAuthOther license |
|---|---|---|---|
| Overview | |||
| Primary focus | Customer identity and access management platform, now part of Okta | Drop-in authentication and user management for web and mobile apps | Self-hostable, developer-first customer identity platform |
| Deployment | Web | Not specified | Self-hosted |
| Source model | Other license | Other license | Other license |
| Pricing model | freemium | freemium | freemium |
| API available | Yes | Yes | Yes |
| Windows desktop | Not specified | Not specified | Not specified |
| Mobile app | Yes | Not specified | Not specified |
| Overview | Auth0 provides authentication and customer identity management (login, MFA, SSO, user management) via SDKs and APIs. Okta acquired Auth0 in 2021, and it now operates as the Auth0 Platform alongside Okta's workforce-identity products. | Clerk provides pre-built authentication UI, session management and user management for developers, via SDKs for React, Next.js and other frameworks, with a free Hobby tier and paid Pro/Business plans. | FusionAuth is a downloadable CIAM server with a free, unlimited-user Community edition, offering OAuth2/OIDC/SAML, MFA and passwordless login for any language or stack. |
| Explore further | |||
| Vendor website | Visit vendor ↗ | Visit vendor ↗ | Visit vendor ↗ |
| ITHub profile | View full profile → | View full profile → | View full profile → |
Auth0Other licenseClerkOther licenseFusionAuthOther licenseⓘ Confirm technical details and prices with each vendor before making a decision.