Licensing
Open source, under Apache 2.0
The Seamless Auth API, server adapters, SDKs, CLI and templates are released under the Apache License 2.0. You can read every line, run it, modify it, self-host it and build on it at no cost.
What you can do
Use it in commercial and closed-source products, including as a hosted service
Modify it without publishing your changes
Bundle the SDKs into your own application under your own license
Redistribute it, modified or not
The license also carries an explicit patent grant from every contributor, which is what most company and government legal reviews look for.
What it asks of you
Keep the license text and the copyright notices when you redistribute it
Mark the files you changed in what you redistribute
Do not use the Seamless Auth or Fells Code names to endorse your product
There is no commercial license to buy. If you would rather not run Seamless Auth yourself, the managed service on the pricing page runs it for you.
This page is a plain-language summary, not legal advice, and does not modify the terms of the Apache License 2.0. For the exact terms, read the license text in each repository; for your specific situation, talk to your own counsel.