Auth.js vs Casdoor: Features, Pricing and User Reviews 2026
Compare features, pricing, reviews, and more to make an informed decision
Auth.js
Auth.js is a free, open-source authentication library for web applications, supporting OAuth, magic links, and credentials across multiple frameworks.
Casdoor
Casdoor is an open-source identity and access management platform with single sign-on supporting OAuth, OIDC, SAML, and multiple authentication methods.
Auth.js
Auth.js is a free, open-source authentication library for web applications, supporting OAuth, magic links, and credentials across multiple frameworks.
Casdoor
Casdoor is an open-source identity and access management platform with single sign-on supporting OAuth, OIDC, SAML, and multiple authentication methods.
Auth.js
OAuth 2.0 and OpenID Connect support
80+ pre-configured authentication providers
Magic link email authentication
Username and password credentials
WebAuthn passwordless login
Multiple framework support (Next.js, SvelteKit, Express)
Database adapters for major databases
JWT or database sessions
Built-in security features
Custom page support
TypeScript ready
Open source and free
Casdoor
OAuth 2.0, OIDC, SAML, CAS, LDAP protocol support
Over 50 social login providers available
Multi-factor authentication with multiple methods
Customizable web admin interface
Multi-tenant organization management
Role-based and attribute-based access control
WebAuthn and biometric login support
Email and SMS verification codes
Audit logs and session management
Database synchronization tools
Auth.js
Auth.js is completely free to use with no pricing tiers or hidden costs. As an open-source project, it is licensed under the ISC license, which allows anyone to use, modify, and distribute the software freely for both personal and commercial projects.
There are no subscription fees, no usage limits, and no charges for any features. All capabilities, including support for unlimited providers, database integrations, and advanced security features, are available at no cost. This makes Auth.js an excellent choice for projects of any size, from small personal websites to large enterprise applications.
The project is maintained by a community of contributors and is now part of Better Auth Inc. Developers can contribute to the project, report issues, and access community support through GitHub discussions completely free of charge.
Casdoor
Casdoor offers three main pricing tiers to fit different organization sizes. All plans include no extra charges per monthly active user, which is different from many other identity platforms.
The Basic plan costs $9 per month and works well for personal projects and small teams. You get support for up to 100,000 users, 20,000 monthly active users, OAuth and OIDC protocols, and basic technical support through tickets within 24 hours.
The Premium plan at $25 per month is designed for growing startups and small companies. This adds SAML, CAS, and LDAP support, custom domains, higher limits with up to 2 million users and 1 million monthly active users, plus faster 8-hour support response times and anti-bot protection.
The Enterprise plan costs $59 monthly and targets medium to large companies. It includes all Premium features with significantly higher limits, multi-region deployment, Azure Active Directory and Google Workspace integration, and advanced security features.