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

WorkOS uses a flexible pricing model where you pay only for what you use, with volume discounts applied automatically.

AuthKit provides user management for free up to one million monthly active users. After that, the cost is $2,500 per month for each additional million users.

Single Sign-On and Directory Sync both charge per enterprise connection. The first connection costs $125 monthly, with discounts as you add more. Pricing drops to $100 per connection for 16-30 connections, $80 for 31-50 connections, $65 for 51-100 connections, and $50 per connection beyond 100.

Audit Logs charges $125 monthly per security monitoring connection, plus $99 per million events stored.

Radar includes the first 1,000 security checks free monthly, then $100 per 50,000 additional checks.

For larger teams, WorkOS offers annual credit packages with pre-payment discounts, guaranteed uptime, and dedicated support.

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.