Head 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?
Cal.com is going closed source
291–300 of 337 posts
Re: Cal.com is going closed source
#292Earlier quoted context omitted.
> otherwise your clients are going to vibe code a custom solution instead of paying you. How many things do you want to be responsible for? How many vibe coded projects do you want to maintain? I think this line of reasoning is overblown. Just because you can doesn't mean a significant number of people will . I think the 3D printer comparison is apt.
Individuals and SMB might stick with Saas but those don't pay much. Enterprise customers have the means to develop in house, those are the customers that will leave. And those are the whales of the Saas business.
This is why companies outsource anything. Google, Inc. is big enough to own farms and ranches to grow the food eaten in its cafeterias. They could make trucks to transport that food. They could operate factories to make cutlery, etc. Why do they instead choose to pay layers of margins to layers of middlemen?
Absurd example? How about Apple? They outsource production of their chips, instead of capturing the margin they are currently gifting to their partners. Why?
Delta Airlines doesn’t operate oil fields or even refineries even though a major cost of their operations is jet fuel. Why?
Once you can reason through these very simple examples, you will understand why enterprises are unlikely to walk away from SaaS.
Re: Cal.com is going closed source
#293Drew Breunig published a very relevant piece yesterday that came to the opposite conclusion: https://www.dbreunig.com/2026/04/14/cybersecurity-is-proof-o... Since security exploits can now be found by spending tokens, open source is MORE valuable because open source libraries can share that auditing budget while closed source software has to find all the exploits themselves in private. > If Mythos continues to find e…
Re: Cal.com is going closed source
#294Head 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
I would like to, but... have you tried to use thunderbird on an "older" linux laptop nowadays? Even with 8 gigs of ram, and a non-fancy memory-saving windowmanager, thunderbird is almost unusable now (large imap mbox), firefox even worse. I don't see why all that additional bloat is needed, or wanted. Please keep in mind, that a lot(!) of people are not able to afford buying new hardware every now and then anymore. A…
Re: Cal.com is going closed source
#295Earlier quoted context omitted.
Same story as always, writing the code in the easy part. Requirement gathering, analysis, consensus, direction, those are all the hard parts. Enterprises have a business to run and don’t want to run a software shop on top of everything else.
The story is usually that businesses don't want to commit to indefinitely expending their limited efforts maintaining software which isn't part of the company's core competencies. Most of the cost and effort of software happens after the first release is delivered. > Enterprises have a business to run and don’t want to run a software shop on top of everything else. It sounds like you mostly understand here. The bigge…
saas value to an enterprise is more than just the functionality provided and I think that is lost on a lot of the heads down software devs here.
Re: Cal.com is going closed source
#296Earlier quoted context omitted.
hey cofounder here. since it takes my 16 year old neighbors son 15 mins and $100 claude code credits to hack your open source project
Are you at all worried that the message you are spreading here is "We are no longer confident in our own ability to secure your data?"
Re: Cal.com is going closed source
#297Earlier quoted context omitted.
Individuals and SMB might stick with Saas but those don't pay much. Enterprise customers have the means to develop in house, those are the customers that will leave. And those are the whales of the Saas business.
They won’t, because specialization is a key aspect of capitalism. This is why companies outsource anything. Google, Inc. is big enough to own farms and ranches to grow the food eaten in its cafeterias. They could make trucks to transport that food. They could operate factories to make cutlery, etc. Why do they instead choose to pay layers of margins to layers of middlemen? Absurd example? How about Apple? They outsou…
https://en.wikipedia.org/wiki/Trainer_Refinery
https://www.reuters.com/business/energy/delta-air-lines-refi...
Re: Cal.com is going closed source
#298Earlier quoted context omitted.
I would like to, but... have you tried to use thunderbird on an "older" linux laptop nowadays? Even with 8 gigs of ram, and a non-fancy memory-saving windowmanager, thunderbird is almost unusable now (large imap mbox), firefox even worse. I don't see why all that additional bloat is needed, or wanted. Please keep in mind, that a lot(!) of people are not able to afford buying new hardware every now and then anymore. A…
Why don't you use an older version?
Re: Cal.com is going closed source
#299Re: Cal.com is going closed source
#300Earlier quoted context omitted.
They won’t, because specialization is a key aspect of capitalism. This is why companies outsource anything. Google, Inc. is big enough to own farms and ranches to grow the food eaten in its cafeterias. They could make trucks to transport that food. They could operate factories to make cutlery, etc. Why do they instead choose to pay layers of margins to layers of middlemen? Absurd example? How about Apple? They outsou…
Delta owns and operates a refinery. https://en.wikipedia.org/wiki/Trainer_Refinery https://www.reuters.com/business/energy/delta-air-lines-refi...
s/Delta/United/ or s/Delta/Southwest/ or s/Delta/Lufthansa/. Or if you prefer, s/refinery/oilfield, or s/refinery/pipeline. Or even s/refinery/farm/ because Delta also buys food in vast quantities (I would not be surprised to find they have interests in ag producers that offset a small % of their food purchases, which does not diminish the argument).
Delta also does not make airplanes, jet engines, seats, radios, GPS, glass, or even wires. They don't distill the spirits they serve on their flights. They don't own and operate a satellite Internet capability. They don't even make movies for in-flight entertainment.
The point is that Delta, like most successful firms, outsources key aspects of core service delivery.
The second article you linked says plainly that the refinery is an offset/hedge. QED Delta still outsources the vast majority of its fuel costs. (They could, for example, own large swathes of the Permian and do E&P as well. They choose to leave that to others.)