A join form on any full session: a name and an email, no account needed
A cancellation offers the freed place to whoever has waited longest, automatically
A time limit you set, and an unclaimed place passes to the next person
Your whole waitlist in your site's CMS, in twelve languages
A cancellation is money on the floor. Someone drops out of your Thursday 18:00 class at nine in the morning, and you find out when you count heads at six.
Booking Waitlist closes that gap. A visitor who finds a session full leaves their name instead of leaving your site. When a booking is cancelled, the app offers the freed place to whoever has waited longest and gives them a window you set; if they do not take it, it passes to the next person. One place is offered to one person at a time, and re-checked before anyone is told it is theirs.
For classes, courses and appointments. The free plan holds 10 people per session; Pro raises it to 200.
What it does not do:
It does not make the booking. Taking a place holds it and notifies you; the person books through your normal flow, so your payment and cancellation rules stay yours.
It does not send the email. It reports the event to your site's automations; your own automation sends the message, in your words. There is a one-time setup step.
It does not replace the built-in waitlist for classes. Use one or the other on a session, not both. It exists because it also works for appointments and needs no separate account.