¶ Origins and Founding
Cal.com was founded with a mission to create “scheduling infrastructure for absolutely everyone.” The project emerged as an open-source alternative to commercial scheduling tools like Calendly, offering organizations full control over their scheduling data and infrastructure.
¶ Growth and Development
- Initial release as open-source project
- Built on modern web stack (Next.js, React, TypeScript)
- Focus on developer experience and API-first design
- Early adoption by privacy-conscious organizations
- Introduction of team scheduling features
- Calendar integrations (Google, Microsoft, Apple)
- Video conferencing integrations (Zoom, Daily.co)
- Payment processing with Stripe
- Growing community contributions
- Organizations and multi-team support
- Advanced admin controls
- SSO/SAML integration
- White-label capabilities
- API rate limiting and management
- Compliance features
- Latest version: v6.1.16 (February 2026)
- 4,100+ GitHub stars
- 1,500+ forks
- 95+ contributors
- Active community support
Cal.com has maintained a modern technology stack throughout its development:
| Technology |
Implementation |
| Frontend |
Next.js, React, Tailwind CSS |
| Backend |
Node.js, tRPC |
| Database |
PostgreSQL with Prisma ORM |
| Auth |
NextAuth |
| Validation |
Zod |
| Architecture |
Turborepo monorepo |
Cal.com uses a dual-license approach:
- AGPL-3.0: Core single-player APIs and features
- Enterprise Edition: Commercial license for multi-player features, SSO, admin panel, organizations, payments, and teams
This model allows:
- Free self-hosting for individuals and small teams
- Commercial support for enterprise deployments
- Sustainable open-source development
¶ Community and Ecosystem
- Repository: https://github.com/calcom/cal.com
- Stars: 4,100+
- Forks: 1,500+
- Contributors: 95+
- Language: TypeScript (97.6%)
¶ Docker and Deployment
- Official Docker images:
calcom/cal.com
- Docker Hub: 50K+ pulls
- ARM support for Raspberry Pi and Apple Silicon
- Community-supported Docker deployment
Cal.com supports extensive integrations:
- Calendars: Google Calendar, Outlook, Apple Calendar, ICS
- Video: Zoom, Daily.co, Google Meet, Microsoft Teams
- Payments: Stripe
- CRM: HubSpot, Zoho, Salesforce
- Automation: Zapier, Make (Integromat)
- Communication: Twilio, SendGrid
Cal.com emphasizes self-hosting as a core value:
- Full data ownership
- No vendor lock-in
- Customizable deployment
- Privacy-focused
- API-driven architecture
| Aspect |
Status |
| Development |
✅ Active |
| Latest Version |
v6.1.16 (Feb 2026) |
| License |
AGPL-3.0 / Enterprise |
| Docker Images |
✅ Official images |
| Community |
✅ Active (Discord, GitHub) |
| Documentation |
✅ docs.cal.com |
Cal.com continues to develop:
- Enhanced AI-assisted scheduling
- Improved enterprise features
- More integrations
- Better mobile experience
- Expanded API capabilities
- Performance optimizations