The short version
The Cal.com fork commenters pointed to as the obvious alternative.
From the HackerLinks archive
cal.diy
The Cal.com fork commenters pointed to as the obvious alternative.
At a glance:
First seen:2026-04-16
Last seen:2026-04-16
Times seen:1
Website:cal.diy
Why it caught our attention
It was directly recommended as the thing people who care should use instead.
Where it surfaced on Hacker News
2026-04-16
Editorial paraphrase
“anyone who cares would just use cal.diy as they were prior to this announcement”.
Original threadCal.com is going closed source
Also surfaced in this discussion
schedyou
Cal.com is going closed source
2026-04-16
Thunderbird Appointment
Cal.com is going closed source
2026-04-16