Here’s a little chart to compare Koalendar and Choice Eliminator 2 features for yourself:
Choice Eliminator 2 is a free Google Forms add-on that automatically removes choices when someone has already picked them. To use this for appointments, you'll need to create a Google Form with your available times. With the functionality of Choice Eliminator 2, individual form respondents can book a time with you without double booking. Although it works, setting this up is challenging. You’ll need to input your availability for every single day, which can be a tedious process if you hold appointment schedules all year round. Since it’s limited to Google Forms, the add-on doesn’t integrate with calendar apps and other software.
Koalendar is a great Choice Eliminator 2 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.