The Changelog: Software Development, Open Source
The Changelog: Software Development, Open Source
Changelog Media
Forking Cal.com to closed source (Interview)
1 hour 54 minutes Posted Sep 3, 2026 at 8:00 pm.
It's The Changelog!
Sponsor: Coder.com
It's about time
AI reshuffles the startup playbook
Slop is overwhelming maintainers
The security pendulum swings back
Most open source repos are compromised
Commercial open source as a target
Sponsor: Buildkite
Forking Cal.com's code private
Other COSS companies struggling
Prescription: go private, patch vulnerabilities
Is GitHub at risk?
Sponsor: WorkOS
Mitchell Hashimoto's GitHub fix
The AI coding landscape
The autonomous agent future
Cal.com's growth story
Burning money to grow
Growing SaaS without AI
The reschedule UX problem
Racing toward 10 million ARR
Closed source and the tldraw license
Open source isn't dead, it's changing
Wrapping up
Closing thoughts and stuff
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1:54:32
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Show notes
This week I'm joined by Peer Richelsen, co-founder of Cal.com. What if the majority of open source repositories are already compromised and we just don't know it yet? That's the theory Peer brings to the table this week. We dig into how AI has flattened the knowledge graph to the point that a 16-year-old can vibe hack a power station just as easily as their mom can vibe code an iOS app, why the reporting culture that has kept open source safe all these years is collapsing under AI generated noise, Cal.com's move to fork its own codebase and take the sensitive parts private, and the eye opening reality that shipping "$1 of AI tokens for pennies on the dollar" is now a common startup business model.