Cal.com is a commercial open source company and thereby we fully support other open source projects, whether it’s commercial or non-commercial. We’re friends of many other COSS companies.

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Sponsorship Criteria

  • The project should be non-commercial or a commercial open source company with less than $2M in ARR
  • The project should be open source
  • Include our “Book us with Cal.com” banner in your footer and link to a Cal.com booking link of your choice
  • Include our “Book us with Cal.com” banner in your open source repository’s README.md file and link to a Cal.com booking link of your choice
  • Add the UTM tag with the format for the banners: ?utm_source=banner&utm_campaign=oss

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HTML Code:

<img alt="Book us with Cal.com" src="https://cal.com/book-with-cal-dark.svg" />
or 
<img alt="Book us with Cal.com" src="https://cal.com/book-with-cal-light.svg" />

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How to apply

Please note that we have a limited number of openings for OSS sponsorships each month. If you’re interested in applying for a sponsorship for your open source software project, please follow these steps:
  • Ensure that you meet all the sponsorship criteria mentioned above.
  • Send an email to peer@cal.com and explain what you are working on and confirm that you meet all the sponsorship criteria (watch out, Peer may invest a small angel check in your COSS company 👀)
  • Explaining why Cal.com’s free tier or open core is insufficient for your project
  • Include your Cal.com team slug and provide a link to your open source repository in the email.
Please note that sponsorship requests are reviewed on a monthly basis, so allow some time before reaching out for updates. We reserve the right to reject any project at will without reason.