Schedule a meeting, share link, and let everyone mark their time. The host gets a view of everyone's time and can quickly find a time that works for everyone. No account. No signup. No login. You can password-protect meetings when you need to keep them private. There are already plenty of scheduling tools out there. I just didn't like the amount of friction involved for such a simple problem. So I made mine almost ridiculously simple. Hopefully it saves someone else a few dozen messages too.