Can I open-source zcal?
KINDA · partial or early alternativesKinda. Cal.com cover the core of zcal, but they're early or partial — expect gaps like multi-calendar conflict handling and race-free booking under load.
zcal: People pay because a booking tool must never double-book them, leak private events, or send the wrong time to a client.
xmulti-calendar conflict handling
xrace-free booking under load
xteam routing and round robin
xreliable reminders and timezone edge cases
xcalendar-provider edge cases and timezone correctness
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
zcal pricing
| plan | monthly | annual (per mo) | what you get |
|---|---|---|---|
| free forever | $0/user | $0/user | Unlimited scheduling links, meeting polls, and calendar connections. |
| pro | $7/user | — | 750 SMS credits/month; advanced scheduling and branding controls. |
| business | $12/user | — | 1,500 SMS credits/month; team administration and business controls. |
free tierUnlimited scheduling links, meeting polls, and calendar connections.
billingmonthly only; no annual price is published
hidden costsSeats added mid-cycle are prorated; SMS usage beyond included credits may require more credits, but the public overage price was not verified.
verified 2026-08-14 · source ↗
Can I open-source zcal?
Kinda. Cal.com covers the core of zcal, but there are real gaps: multi-calendar conflict handling, race-free booking under load. Read the honest list above before committing.
How much does zcal cost?
zcal'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 Do not publish a number until rechecked..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 zcal?
Honestly: multi-calendar conflict handling; race-free booking under load; team routing and round robin; reliable reminders and timezone edge cases; calendar-provider edge cases and timezone correctness. If any of those are load-bearing for you, keep paying.
Is there an open-source alternative to zcal?
Yes: Cal.com (Open scheduling infrastructure with booking pages, round-robin, routing forms, and app integrations)