Cal.com

Cal.com is an open-source scheduling infrastructure platform that provides Calendly-like scheduling functionality with the added benefits of self-hosting capability, full API access, and unlimited customization. The platform offers individual and team scheduling, round-robin assignment, collective availability for group meetings, recurring bookings, and workflow automations triggered by booking events. Cal.com supports multiple calendar integrations including Google Calendar, Microsoft Outlook, and Apple Calendar, video conferencing through Zoom, Google Meet, and Microsoft Teams, and payment collection through Stripe. The open-source nature means organizations can self-host Cal.com for complete data ownership and customize the platform to match specific requirements that proprietary scheduling tools cannot accommodate. The platform provides embeddable booking widgets, branded booking pages, custom workflows that send emails, SMS, or webhook notifications at configurable intervals around bookings, and a developer-friendly API for building scheduling into custom applications. Cal.com Atoms allow embedding individual scheduling components like date pickers and time slot selectors into existing applications for seamless integration. For enterprises, Cal.com offers a managed cloud version with SSO, SCIM provisioning, and dedicated support. The platform has been adopted by companies wanting scheduling infrastructure they fully control, developers building scheduling into their products, and organizations with compliance requirements that necessitate self-hosted solutions.