Here’s a little chart to compare Koalendar and Choice Removal features for yourself:
Choice Removal is a Google Forms add-on that automatically removes responses in your form when they've been chosen. Use this to manage your appointments by creating a Google Form with your available dates and times as choices to a question. Once someone picks their preferred booking, it is erased for all next respondents. Because the add-on is on Google Forms, it doesn’t integrate with calendars and other applications. It’s also tedious to set up because the interface is not intuitive. You’ll also need to input your availability manually, which will take a lot of time.
Koalendar is a great Choice Removal alternative because it offers a clean, modern, and intuitive interface, for free.
Your invitees will get a delightful booking experience along with a customizable questionnaire to qualify them. You'll also enjoy a live and quick customer service, directly from the developer.
But don't take our word for it: feel free to try Koalendar free account.