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Re:Cal.com is going closed source by ryanleesipes on Wednesday April 15, 2026 @06:38PM (#47786264)
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

Re:Cal.com is going closed source by ezekg on Wednesday April 15, 2026 @06:55PM (#47786400)
"Thunderbird, the open source Cal.com"
Re:Cal.com is going closed source by ryanleesipes on Thursday April 16, 2026 @07:33AM (#47791564)
Love it!
Re:Cal.com is going closed source by raybb on Wednesday April 15, 2026 @08:51PM (#47787354)
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 by bean469 on Thursday April 16, 2026 @03:45AM (#47789927)
There are screenshots in the link[1] provided in the README.md

1. https://stage.appointment.day

Re:Cal.com is going closed source by m3nu on Thursday April 16, 2026 @04:43AM (#47790348)
A Docker image would be good too.
Re:Cal.com is going closed source by ryanleesipes on Thursday April 16, 2026 @07:34AM (#47791578)
Yes, we should. Will do that today
Re:Cal.com is going closed source by devmount on Thursday April 16, 2026 @09:44AM (#47792858)
We added some screenshots to the repository now. Thanks so much for the suggestion!
Re:Cal.com is going closed source by sashimimono on Wednesday April 15, 2026 @10:17PM (#47787881)
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. And this is getting worse. First the pandemic, then the war in Ukraine, now the war in Middle-East. Shortage of ram/storage/everything (thanks ai) and massivly increased costs of energy, housing, food, insurance, everything. And in the years to come, I am afraid, that will be getting worse. Please think about it, when adding the "next cool feature", 'Keep the internet affordable'. --thunderbird user since 1.0
Re:Cal.com is going closed source by hedora on Wednesday April 15, 2026 @10:24PM (#47787930)
Regarding FF: Something is probably wrong with your install, or the websites you have open.

As a datapoint: FF + Chrome with lots of stuff open uses 2.6GB on my machine. With XFCE and a GB of other apps, it’s using about 4GB. 15 year old machine. Perf is fine.

Re:Cal.com is going closed source by carlosjobim on Thursday April 16, 2026 @10:19AM (#47793350)
Why don't you use an older version?
Re:Cal.com is going closed source by sashimimono on Thursday April 16, 2026 @10:40AM (#47793687)
security reasons. since you can't controll what other people are sending to you, you always want to use the most recent as-bug-free-as-possibly version, see https://www.mozilla.org/en-US/security/known-vulnerabilities...
Re:Cal.com is going closed source by winrid on Wednesday April 15, 2026 @11:35PM (#47788386)
> Come talk to us and build with us

do we need an appointment :)

Re:Cal.com is going closed source by bean469 on Thursday April 16, 2026 @03:43AM (#47789916)
Thanks, looks like a great alternative
Re:Cal.com is going closed source by jen729w on Thursday April 16, 2026 @04:53AM (#47790414)
1. Goes to site. Clicks appointment.tb.pro link in sidebar.

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 by kewisch on Thursday April 16, 2026 @08:05AM (#47791819)
I'm curious how it blocked your email, could you share more details on what message you got? Feel free to reach out to me outside of HN.
Re:Cal.com is going closed source by jen729w on Thursday April 23, 2026 @08:05PM (#47883861)
I blocked the email. I use one-time addresses at Fastmail.

I meant that after step 3, I was never interested in hearing from the service again.

Re:Cal.com is going closed source by ryanleesipes on Thursday April 16, 2026 @07:32AM (#47791562)
Yeah. We need to create a docker container and make it easy to deploy for folks. We're not ready with the hosted option at the moment.