[tylermenezes]

This looks like a wonderful tool, but I would be hesitant to use it solely because I'm sure Calendly's IP lawyers will try to shut you down for the name. (It's similar enough that I mistook the HN post for Calendly several times.)

[samspenc]

+1 as a heavy Calendly user (with plenty of friends who also use Calendly), I initially mistook this for a post promoting Calendly.

[thedays]

I think they’re unlikely to have grounds. Calendar is a standard dictionary word and so they can hardly claim ownership of it or any misspellings of it like calenday