This seems kind of crazy. If LLMs are so stunningly good at finding vulnerabilities in code, then shouldn't the solution be to run an LLM against your code after you commit, and before you release it? Then you basically have pentesting harnesses all to yourself before going public. If an LLM can't find any flaws, then you are good to release that code. A few years ago, I invoked Linus's Law in a classroom, and I was…
After a release, attackers have effectively infinite time to throw an LLM against every line of your code - an LLM that only gets smarter and cheaper to run as time passes. In order to feel secure you’d need to do all the work you’d imagine an attacker would ever do, for every single release you ship.
Cal.com is going closed source
231–240 of 337 posts
Re: Cal.com is going closed source
#232This is a weird knee-jerk reaction. I feel like this is more a business decision than a security decision. I feel like with AI, self-hosting software reliably is becoming easier so the incentives to pay for a hosted service of an OSS project are going down.
AI is certainly getting a lot of milage as an excuse for doing bad things. Wanna sack a load of staff? - AI Wanna cut your consumer products division? - AI Wanna take away the source? - AI
Re: Cal.com is going closed source
#233This is a weird knee-jerk reaction. I feel like this is more a business decision than a security decision. I feel like with AI, self-hosting software reliably is becoming easier so the incentives to pay for a hosted service of an OSS project are going down.
Their product is getting commoditized: https://workspace.google.com/resources/appointment-schedulin...
Re: Cal.com is going closed source
#234Head of Thunderbird project here. Our scheduling tool, Thunderbird Appointment, will always be open source. Repo here: https:// github.com/thunderbird/appointment Come talk to us and build with us. We'll help you replace Cal.com
You should add some screenshots to the readme or somewhere before a sign in screen. Sounds like a great tool though. How much is the hosted version?
Re: Cal.com is going closed source
#235Head of Thunderbird project here. Our scheduling tool, Thunderbird Appointment, will always be open source. Repo here: https:// github.com/thunderbird/appointment Come talk to us and build with us. We'll help you replace Cal.com
2. Gives email address.
3. Is told to join the waitlist.
4. Blocks email address given at 2.
Hardly a terrific experience.
Re: Cal.com is going closed source
#236Re: Cal.com is going closed source
#237Re: Cal.com is going closed source
#238Earlier quoted context omitted.
Does your ideal world have an easy path to citizenship? I might like to live there.
> SAN FRANCISCO – March 17, 2026 – The Linux Foundation, the nonprofit organization enabling mass innovation through open source, today announced $12.5 million in total grants from Anthropic, AWS, GitHub, Google, Google DeepMind, Microsoft, and OpenAI to strengthen the security of the open source software ecosystem. https://openssf.org/tag/google "But that's Linux, how small libraries get audit budget..." fortunately…
I take back the “I might like to live there” :)
Re: Cal.com is going closed source
#239Re: Cal.com is going closed source
#240The real threat is not security but bad actors copying your code and calling it theirs. IMHO, open source will continue to exist and it will be successful but the existence of AI is deterrent for most. Lets be honest, in recent times the only reason startups went open source first was to build a community and build organic growth engine powered by early adaptors. Now this is no longer viable and in fact it is simply…
Otherwise, copying code and improving it with AI or with humans is the same, as long as the product improves.
I doubt that many semi-automatic AI copies can really improve a product more than the original team, for really valid products.
AI will be a filter of bad quality.