Calendly vs x.ai, and what to use now that x.ai is gone
x.ai was an AI assistant you copied on email to schedule meetings. Calendly is a booking-link tool. x.ai was bought by Bizzabo in 2021 and its standalone assistant was shut down, so the real choice now is a booking link, an email assistant, or a tool that does both, like CalendarPA.
How they compared
| Feature | Calendly | x.ai |
|---|---|---|
| How you schedule | Send a booking link; the invitee picks a time | Copy the assistant on an email; it negotiates a time |
| Status | Available | Discontinued after Bizzabo bought it in 2021 |
| AI email assistant | Callie, in beta, on Standard Plus and Teams Plus | Was the whole product |
Booking link or AI assistant?
A booking link is quickest when the other person is happy to pick a time. An assistant is better when they would rather reply to an email, or when several people need to agree. Most people meet both cases.
One tool for both
CalendarPA gives you a booking page and AdaPA, an assistant you copy on email or text, on every plan. AdaPA offers only times your calendars show free. See how AdaPA works.
Third-party facts on this page were checked against each company’s own pages on November 7, 2026.
Frequently asked questions
Is x.ai still available?
No. Bizzabo bought x.ai in 2021 and shut down the standalone scheduling assistant.
What is the difference between a booking link and an AI scheduler?
With a booking link the invitee picks a time from your page. With an AI scheduler you copy an assistant on the email and it finds the time for you.
Does Calendly have an AI assistant?
Yes, in beta. Calendly’s Callie schedules over email on its Standard Plus and Teams Plus plans, and each change needs the host’s approval.
What replaced x.ai?
Several tools now schedule from email, including Calendly’s Callie and CalendarPA’s AdaPA. AdaPA is on every CalendarPA plan, including the free one.
Can one tool do both?
Yes. CalendarPA gives you a booking page and AdaPA together, on every plan.
See also
Try a booking page and AdaPA together
Both are on the free Starter plan.
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