Category
Authentication & User Management
SSO, MFA, Passkeys, OAuth, and developer-first user authentication.
Tools
Head-to-head comparisons
Enterprise Legacy vs Modern React DXAuth0vsClerkAuth0 is the enterprise powerhouse with legacy SAML/LDAP support, while Clerk is the modern developer darling built specifically for React/Next.js with pre-styled drop-in components.Read comparison React DX vs Auth Plus BillingClerkvsKindeClerk is the best drop-in auth UI for React and Next.js, with excellent session and passkey support. Kinde adds billing and usage-based plans to the auth product, which matters for SaaS that sells subscriptions.Read comparison Enterprise Identity vs Open Source SessionsAuth0vsSuperTokensAuth0 sells enterprise identity: SSO federation, compliance paperwork and every protocol. SuperTokens is Apache-2.0 code you run yourself, with sessions stored next to your own users, which removes both the per-MAU bill and the data-residency question.Read comparison Java Identity Server vs Developer AuthKeycloakvsSuperTokensKeycloak is the standard open-source identity server: realms, LDAP sync, SAML and OIDC, built for organisations with existing directories. SuperTokens is a lighter developer auth library for product teams that just need sessions, social login and MFA.Read comparison Proprietary vs Open sourceAuth0vsKeycloakOkta Auth0 is a proprietary Authentication & User Management tool priced as per Monthly Active User (MAU), starting at $35/mo (B2C) / Custom (B2B). Keycloak is open source, priced as 100% Free Open-Source (Red Hat Community), starting at $0 (Free Self-Hosted).Read comparison Proprietary vs ProprietaryAuth0vsKindeOkta Auth0 is a proprietary Authentication & User Management tool priced as per Monthly Active User (MAU), starting at $35/mo (B2C) / Custom (B2B). Kinde is proprietary, priced as per MAU tier plus enterprise features, starting at $25/mo (Pro).Read comparison Proprietary vs Open sourceClerkvsKeycloakClerk is a proprietary Authentication & User Management tool priced as mAU-based Freemium, starting at $25/mo. Keycloak is open source, priced as 100% Free Open-Source (Red Hat Community), starting at $0 (Free Self-Hosted).Read comparison Proprietary vs Open sourceClerkvsSuperTokensClerk is a proprietary Authentication & User Management tool priced as mAU-based Freemium, starting at $25/mo. SuperTokens is open source, priced as open source (Apache-2.0) / Cloud usage-based, starting at $0 (self-hosted) or free Cloud up to 5,000 MAU.Read comparison Open source vs ProprietaryKeycloakvsKindeKeycloak is a open source Authentication & User Management tool priced as 100% Free Open-Source (Red Hat Community), starting at $0 (Free Self-Hosted). Kinde is proprietary, priced as per MAU tier plus enterprise features, starting at $25/mo (Pro).Read comparison Open source vs ProprietarySuperTokensvsKindeSuperTokens is a open source Authentication & User Management tool priced as open source (Apache-2.0) / Cloud usage-based, starting at $0 (self-hosted) or free Cloud up to 5,000 MAU. Kinde is proprietary, priced as per MAU tier plus enterprise features, starting at $25/mo (Pro).Read comparison