Auth0

Auth0 targets teams that want standards-based authentication without building crypto, session, and threat primitives in-house. Universal Login provides hosted, brandable flows; Actions and Rules customize tokens and integrate risk vendors; Organizations model B2B tenants; enterprise connections cover SAML and HR-driven IdPs.

Public B2C-oriented cards on auth0.com/pricing (March 2026) list Free at $0/month for up to 25,000 monthly active users, including 1 enterprise connection, self-service SSO, SCIM, 1 custom domain (credit card verification noted), unlimited social connections (subject to system limits), 5 organizations, and community support. Essentials is $35/month for up to 500 MAU with higher auth/API limits, Pro MFA, RBAC per organization, 10 organizations, log streaming to SIEM partners, separate dev/prod environments, and standard support. Professional is $240/month for up to 500 MAU with custom database connections, enterprise MFA, enhanced attack protection, and M2M token add-ons on self-serve plans.

Enterprise is custom with SLAs, private deployment options, and advanced security add-ons. External active users above free limits require paid plans with MAU tiers you select during signup—Auth0’s FAQ references stepping past 25k users into paid MAU buckets. Machine-to-machine auth limits differ by plan (public comparison table cites 1,000 on Free/Essentials and 5,000 on Professional for baseline M2M allowances—verify current table).

Compare Stytch or Clerk for opinionated B2C/B2B DX; compare WorkOS when SAML admin portals are the primary gap beside your existing auth.