Cal.com, the open-source scheduling platform that became a popular alternative to Calendly, is closing its codebase in response to AI-related threats. The company announced the shift away from its open-source model, sparking debate about the future of open-source software in an AI-dominated world. Strix.ai published an analysis arguing that Cal.com learned the wrong lesson from the changing competitive landscape.

The decision represents a significant moment for the open-source community. Cal.com had built a substantial following by offering its scheduling technology freely, allowing developers to self-host and customize the platform. Many in the Hacker News discussion questioned whether closing the code actually protects against AI competition, noting that open-source projects typically face different competitive pressures than proprietary software.

This move adds to ongoing tensions between traditional open-source values and the business challenges posed by AI companies that can train on public code. Critics argue that closing source code provides little defense against AI systems that can generate similar functionality independently. The episode highlights a broader reckoning for open-source maintainers weighing community benefits against commercial sustainability.