Cal.com is going closed source with a major shift in its license strategy

The scheduling platform Cal.com has launched v6.4, introducing a major shift in its open source license model. Citing the growing impact of AI coding tools and the risks of exposing public code, the company is moving its commercial edition to a "closed source" model after previously offering it as "source-available". At the same time, all free and open source code is being relaunched as Cal.diy under the MIT License, creating a more permissive community edition for self hosting. Cal.com says Cal.diy will remain free for hobbyists and community users, along with setup instructions, although it notes that self hosted use is at the user’s own risk.

For enterprise customers who self host, access to the commercial edition will now be handled through a private GitHub repository. Cal says the licensing update does not change product or account access for existing users and is mainly a change to its open source license and code availability.

Beyond that, v6.4 also improves performance for large organizations, with the bookings page and event type configuration now loading much faster, in some cases by up to 20 times. The release also brings several workflow and security updates, including a new routing trace for round robin host selection, more advanced Salesforce ownership routing, support for OAuth secret rotation and multiple redirect URIs, and a fix for a double booking issue caused by concurrent confirmations. You can check all the other improvements and bug fixes in the official release notes here.