Here’s a little chart for you to compare Koalendar and When2meet for yourself:
When2Meet is a free web-based tool that helps facilitate coordination for schedule availability. It features a calendar interface that lets you encode your available times and a link that you can share with your colleagues so they can input theirs. The platform is focused on collecting availability so you can manually pick the best meeting time. As such, it doesn’t connect with Google Calendar and create final meeting invites for you. You’ll also have to create your online meetings in Zoom and Google Meet manually once the meeting is confirmed.
Koalendar is a great When2meet 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.