Open Source Calendly Alternative

Why choose an open-source Calendly alternative

Calendly stores every booking, calendar sync, and contact record on its own servers, and its per-seat pricing scales with headcount rather than usage. Enterprise features such as single sign-on and advanced routing forms sit behind Calendly's higher-priced tiers. Self-hosting a scheduling tool moves that data onto infrastructure the team controls, removes seat-based fees, and opens the door to custom booking logic that a closed SaaS API would not expose.

What to look for

A scheduling alternative needs calendar sync across Google, Outlook, and CalDAV, conflict detection across multiple connected calendars, timezone handling for international attendees, buffer times between meetings, and daily booking limits to prevent an overloaded calendar. It should also offer a public booking page that can be embedded on a website or shared as a standalone link, plus video conferencing links generated automatically for each event. Self-hosted options should ship a documented API and webhooks, since scheduling rarely lives in isolation from CRM or support tooling.

cal.diy as a Calendly alternative

cal.diy is built on the Cal.com codebase and ships as a self-hostable scheduling platform with booking pages, round-robin and collective event types, calendar sync across Google, Outlook, and Office 365, and native video integrations including Zoom and Google Meet. A self-hosted install typically runs via Docker Compose against a Postgres database, and the booking page supports custom questions, buffer times, and availability schedules per event type. Because it is open source, teams can run it on their own servers or a VPS and extend it through its API rather than waiting on a vendor roadmap. Workflow automation such as reminder emails, SMS, and follow-ups is part of the core product, not an upsell tier, and Zapier or Make can be connected for further automation. Multi-language support and timezone-aware booking pages are included for teams booking across regions.