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Cal.com is going closed source

cal.com

April 15, 2026

3 min read

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65/100

Summary

Cal.com is transitioning from open source to closed source to enhance customer data protection in response to AI-driven security threats. The Cal.diy platform will remain available as an open-source option for hobbyists.

Key Takeaways

Cal.com is transitioning from open source to closed source due to increasing security threats posed by AI.
AI can now systematically scan open source codebases for vulnerabilities, making them more susceptible to exploitation.
The company will continue to offer an open source version called Cal.diy for developers and hobbyists, while the production codebase will remain closed.
Advanced AI models have demonstrated the ability to identify and exploit vulnerabilities at unprecedented speeds, highlighting the urgency of the security landscape.

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Community Sentiment

Mixed

Positives

LLMs are proving to be highly effective at identifying vulnerabilities in code, suggesting a valuable role for AI in enhancing software security practices.
The discussion around AI's impact on open source highlights the potential for self-hosting to become more accessible, which could empower developers.

Concerns

The shift to closed source is perceived as a business decision rather than a genuine security concern, raising questions about transparency and trust.
There are fears that relying on closed source software for security could lead to a dangerous model of security through obscurity, which is widely criticized.