Auth.js vs Kinde: Features, Pricing and User Reviews 2026

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.

Kinde offers transparent pricing that grows with your business:

The Free plan costs nothing and includes up to 10,500 monthly active users. You get all basic features including authentication, organizations, feature flags, and standard support. This plan works great for getting started and testing.

The Pro plan costs $25 per month and removes limits on users and organizations. You keep the 10,500 free monthly active users, then pay only for additional usage. This plan adds API keys and removes Kinde branding.

The Plus plan at $75 monthly includes enterprise single sign-on for free, six different environments, and priority features. You also get discounts on transaction fees and user costs.

The Scale plan costs $250 per month and provides the most advanced features including custom domains for each organization, custom email settings, and complete security reports. This plan offers the biggest discounts for high-volume usage.