Auth0 by Okta is a hosted identity platform that helps developers add sign-up, sign-in, user management, and API authorization to web, mobile, and SaaS applications. It supports social login, MFA, passwordless, RBAC, organizations, and extensible actions so teams can build custom authentication flows without maintaining a full identity stack.
Auth0 offers a free plan for smaller projects, typically up to 25,000 monthly active users. Paid B2C plans start around $35 to $165 per month and add support for more MAU, branding, advanced security, and higher service levels. B2B plans are more expensive, often starting around $299 to $899 per month, with enterprise pricing customized by MAU, organizations, compliance needs, support, and advanced factors such as MFA, passwordless, and dedicated support.
Proprietary
Auth0 is a strong choice for teams that want to ship authentication quickly without building and securing their own identity infrastructure. Its biggest strengths are developer experience, broad protocol support, and flexible customization for consumer and B2B applications. The main drawbacks are cost escalation and increasing complexity at enterprise scale. It is best for startups, SaaS companies, and teams that need reliable authentication with minimal infrastructure maintenance.
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