Cal.com

Scheduling Open source

The open-source scheduling infrastructure. A Calendly alternative that you can self-host and customize.

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About

What is Cal.com?

Cal.com is the open-source scheduling infrastructure of the internet — a powerful, self-hostable alternative to Calendly. It enables individuals and teams to manage availability, create booking pages, accept meetings across time zones, and integrate with any calendar system (Google, Outlook, iCloud). With an API-first architecture, a growing app store, round-robin scheduling, routing forms, and team features, Cal.com is the scheduling backbone for modern companies that value privacy, flexibility, and developer control.

Pros & Cons

Pros

  • Fully open-source — self-host for complete data ownership and privacy
  • API-first design makes deep product integration straightforward
  • Supports team scheduling, round-robin, and collective events
  • Connects to Google Calendar, Outlook, iCloud, and CalDAV
  • Growing app marketplace for video conferencing, CRM, and payments
  • Routing forms for intelligent meeting qualification
  • Generous free hosted tier for individual users

Cons

  • Self-hosting requires DevOps knowledge (Docker, PostgreSQL)
  • Some enterprise features require a paid team plan
  • UI/UX customization options less polished than Calendly
  • App store integrations still growing vs. mature competitors
  • Email deliverability setup required for self-hosted instances

Use Cases

Individual booking pages for sales calls, demos, and consultations Team scheduling with round-robin distribution for sales teams Embedding scheduling into a product or website Replacing Calendly for teams with data privacy requirements Building scheduling workflows with custom routing forms
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