You asked about Calendar
9 people built something like it. 4 are gone.
That is 57% of the ones whose fate we could settle, against 23% across the whole register. 2 were acquired.
| Launched | What it was | Today |
|---|---|---|
| 2020-06-01 | YCAkiflow All your tasks and calendars into an AI-powered productivity app · akiflow.com | still up |
| 2017-01-01 | YCFibo SaaS calendar and messaging for SMBs · fiboapp.com | gone |
| 2018-06-01 | YCVimcal The world's fastest calendar, beautifully designed for remote teams. · vimcal.com | still up |
| 2021-01-01 | YCAerotime Calendar that kills time fragmentation · aerotime.com | gone |
| 2021-06-01 | YCHera Calendar app to prepare, join and follow-up on virtual meetings · hera.so | gone |
| 2020-01-01 | YCCron Next-generation calendar for professionals and teams · cron.com | acquired |
| 2025-01-01 | YCStamp The AI Secretary for Email and Calendar. · stampmail.ai | still up |
| 2012-06-01 | A mobile calendar for all the fun stuff you do with friends. · youthere.com | gone |
| 2005-06-01 | YCKiko We're the best online calendar solution to ever exist. Period. · kiko.com | acquired |
How this compares
The register re-probes every domain it holds. Some that answered last month stop answering. We send that list — what went quiet, and what it was — once a month. Nothing else.
How this was made. Show HN entries are every post from 2021 to 2023 with at least five points that linked to its own domain; code hosts and free hosting are excluded, because a repository outlives the effort behind it. Product Hunt entries needed 100 votes — a far higher bar, so they are the promoted top slice rather than a like-for-like sample. Both are judged by asking the domain whether it still answers: gone means it no longer resolves, refuses the connection, serves a parking page, or says plainly that it shut down. An HTTP error is not counted as gone — a server answering 404 is one somebody still pays for, and an audit of 25 gone-calls found two such sites alive with only a moved homepage. Y Combinator entries use the status YC publishes itself, which is why only those can say acquired. Squatted domains — a lapsed name now serving somebody else's site — are not detected, so these figures run slightly low.