Can I open-source Calendbook?
KINDA · partial or early alternativesKinda. Cal.com cover the core of Calendbook, but they're early or partial — expect gaps like race-free booking under load and team routing and round robin.
Calendbook: People pay because a booking tool must never double-book them, leak private events, or send the wrong time to a client.
xrace-free booking under load
xteam routing and round robin
xreliable reminders and timezone edge cases
xcalendar-provider edge cases and timezone correctness
xmulti-calendar conflict handling
These projects already replace it, free.
CCal.comOpen scheduling infrastructure with booking pages, round-robin, routing forms, and app integrationsopen source↗What each one is, in full: Cal.com
no votes, no pay-to-list · just what's real
Calendbook pricing
| plan | monthly | annual (per mo) | what you get |
|---|---|---|---|
| free | $0/user | $0/user | Unlimited bookings, 1 event type, 1 connected calendar, username/booking page and embed |
| premium | — | $2/user | Unlimited event types, up to 10 calendar connections, Zapier and webhooks |
| professional | — | $5/user | Premium features plus custom branding, advanced availability and accept/reject controls |
free tierUnlimited bookings, 1 event type and 1 connected calendar, according to the current homepage
billingannual billing on the current official pricing cards; no monthly rate disclosed
hidden costsThe official homepage and integrations page conflict over whether Free has unlimited bookings, so that limit should be treated cautiously. Paid plans are per user and annual-only on the current public card.
verified 2026-08-14 · source ↗
Can I open-source Calendbook?
Kinda. Cal.com covers the core of Calendbook, but there are real gaps: race-free booking under load, team routing and round robin. Read the honest list above before committing.
How much does Calendbook cost?
Calendbook's pricing is usage-based or varies by plan · The official pricing URL is recorded, but a stable current amount was not safely recoverable in this pass. Do not publish a number until rechecked..
What do I lose by replacing Calendbook?
Honestly: race-free booking under load; team routing and round robin; reliable reminders and timezone edge cases; calendar-provider edge cases and timezone correctness; multi-calendar conflict handling. If any of those are load-bearing for you, keep paying.
Is there an open-source alternative to Calendbook?
Yes: Cal.com (Open scheduling infrastructure with booking pages, round-robin, routing forms, and app integrations)