I did a lot of research for a free app that would make it easy for a group of people to determine what day works best for them, requiring no sign up for anyone besides the person setting it up. This is the best one I've found - https://xoyondo.com/. Source: about 1 year ago

Certainly can be done, but there are already calender schedulers. One I use is https://xoyondo.com for d&d nights lol. Source: over 1 year ago

I use Xoyondo for this. Much less trouble than Doodle. Source: over 1 year ago

Use a scheduling app to find out when everyone will be free. We used Doodle for a while, but the creators kept changing/breaking it, so we've switched to xoyondo.com which is basically Doodle when Doodle was good. Source: almost 2 years ago

I've recently discovered https://xoyondo.com/ which is basically doodle as it was approximately 10 years ago... Source: almost 2 years ago

It matters even more if you need to maintain several-year-worth of information concerning hundreds of customers and share them with others. None of the apps you mentioned above offer the essential privacy and security you need for business use like that. A bit old and outdated, but still a case in point. And, for that, what makes you think Notion is good enough for storing hundreds of customer data? And, not to... Source: almost 3 years ago