Feder and Cal.com: keep Cal.com, check its numbers.
No, Feder is not a replacement for Cal.com. Keep Cal.com. Feder sits beside it and checks whether the numbers it shows can be trusted, by reading what happened at the source and comparing it with your own history.
Why would I need this?
Because the question is not what the number is. It is whether you can trust it.
Is Feder an alternative to Cal.com?
No. Cal.com is scheduling software for online bookings. Feder does a different job: it watches the numbers your tools record and says when one cannot be trusted. Nothing here asks you to switch.
Do I need Feder if I have Cal.com?
They do different jobs, so one does not stand in for the other. Keep Cal.com for the job it does. Feder's job is to say when a number your tools record has gone quiet or moved outside your own history.
What does Cal.com do better?
Cal.com can add an approval step, so each booking request comes to the host to accept before it is final.
In Cal.com's words:
Requiring confirmation adds a manual approval step: when someone books, the request comes to you first
How to require confirmation for your Cal.com bookings, read 2026-11-12.Cal.com lets a host mark guests who missed a past booking, so no shows are kept apart from meetings that happened.
In Cal.com's words:
You can now mark guests as "No Show" for past bookings where one or more attendees did not attend.
Mark guests as no show, read 2026-11-12.Cal.com checks a connected calendar for conflicts, which helps avoid double bookings and puts new bookings on the right calendar.
In Cal.com's words:
avoids double bookings and ensures new bookings are added to the right calendar.
Calendar, read 2026-11-12.
What can go wrong with Cal.com's numbers?
Cal.com explains that a booking waiting for approval stays pending, so requests can sit unconfirmed until the host acts on them.
In Cal.com's words:
Until then, the booking stays in a pending state and no confirmation email is sent.
How to require confirmation for your Cal.com bookings, read 2026-11-12.Cal.com notes that out of office does not cancel bookings already made for those dates, so they can still stand while the host is away.
In Cal.com's words:
Existing bookings on those dates are not cancelled automatically.
Out of office, read 2026-11-12.
How does Feder work with Cal.com?
- Feder reads bookings made and bookings kept from Cal.com. Bookings made feed the Interest signal and bookings kept feed Wins.
- A day Cal.com did not report shows as Not read. It is never shown as zero.
- Feder only reads. It never changes anything in Cal.com.
What should I ask about my Cal.com setup?
- Which numbers on my dashboard are counted at the source, and which are modeled or estimated?
- If this number stopped counting tomorrow, who would notice, and when?
- What does a normal week look like for this number, in my own history?
Questions owners ask
- Does Feder replace Cal.com?
- No. Keep Cal.com. Feder sits beside it.
- Does Feder send data into Cal.com?
- No. Feder only reads.
- How accurate is Feder?
- We do not publish an accuracy number yet. When there is a measured one, it will be here with how it was measured.
Where do these claims come from?
Every quoted statement about Cal.com on this page comes from Cal.com's own pages, quoted above with the date we read them. We read them again by 2027-05-11. If one changes, this page changes or comes down.