[jason_slack]

Your website says: No credit card or personal information is required.

But you requires Google ID, that seems personal to me...

Edit: yes, I can also "create" an account, but that too is personal information.

Edit 2: after the down vote, let me explain. Calendaring and scheduling is inherently personal. Some websites for demo purposes give out a unique URL, not tied to a log-in. This seems appropriate in this case.

[nsgi]

The site is down, but if it just requires an email address and password then I wouldn't class that as personal information. It's easy to create a throwaway.

[jason_slack]

true about the throw-a-way. I could imagine just how much burden this would carry on mail providers if even 1% of the population created a throw-a-away (or more than one!!) for trying sites like this. At 7.5 billion people on this earth...

[jklein11]

There are always services like mailinator

[camidealweek]

Thanks for your feedback. My intent was not a demo, I would say it is a trial. So the app will need something to identify the user, and I chose email because this will be the main contact channel in case you have further requests such as: password reset, questions, etc...