Licensing

The Seamless Auth core is open source, released under the GNU AGPL-3.0. You can read every line, run it, modify it, and self-host it at no cost.

What AGPL-3.0 means in practice

The AGPL is a strong copyleft license. In plain terms: you are free to use and modify Seamless Auth, but if you distribute it, or run a modified version as a network service that others interact with, the AGPL requires you to make your corresponding source changes available to those users under the same license.

For many teams that is completely fine, especially if you self-host it as-is or contribute your changes back. For others, the network source-sharing obligation does not fit their product.

Who needs a commercial license

You may want a commercial license if you plan to:

• Embed or modify the core inside a closed-source product or service
• Offer a modified version to your users without publishing your source changes
• Meet procurement or compliance requirements that a copyleft license does not satisfy

A commercial license grants an exception to the AGPL's source-sharing terms for your use case. If you are simply using the managed service or self-hosting the software unmodified, you do not need one.