Cal.com is going closed source

https://cal.com/blog/cal-com-goes-closed-source-why

Article

  • Cal.com citing AI-assisted vulnerability discovery as reason to close source
  • Argues LLMs make open source codebases easier targets for attackers
  • Joins broader debate about open source viability in AI era

Discussion

  • simonw counters: open source is MORE valuable now since defenders can also run LLMs
  • Most commenters call it security theater / business decision dressed as security
  • Xata commenter notes they went opposite direction simultaneously

Discuss on HN


Type Link
Added Apr 15, 2026
Modified Apr 15, 2026