Cal.com

Cal.com is the open-source scheduling infrastructure for the modern web. It is a Calendly alternative that gives you full control over your scheduling experience. Create booking pages for meetings, consultations, and appointments with customizable availability, buffer times, and booking limits. Cal.com integrates with Google Calendar, Outlook, Apple Calendar, and other calendar providers to prevent double-bookings. It supports round-robin assignment for teams, collective availability for group meetings, and managed event types for organizations. The platform includes payment collection via Stripe, automatic timezone detection, recurring bookings, and custom booking questions. Workflows let you automate email and SMS reminders, follow-ups, and notifications. Cal.com embeds directly into your website with a lightweight widget. The API enables building custom scheduling experiences. Self-hosting is available via Docker for organizations that need data sovereignty. The hosted platform offers a generous free tier with unlimited event types and bookings. For teams, it provides analytics, admin controls, and SSO integration. Cal.com is used by companies ranging from solo consultants to enterprises with thousands of team members.