Cal.com | Open Scheduling Infrastructure
A fully customizable scheduling software for individuals, businesses taking calls and developers building scheduling platforms where users meet users.
Categories:
Cal.com is an open-source, fully customizable scheduling infrastructure that acts as a Calendly alternative for individuals, teams, and developers building scheduling platforms.
🚀 Overview
Cal.com eliminates the endless email back-and-forth for scheduling meetings by providing intelligent infrastructure that syncs calendars across services, checks real-time availability, prevents double-bookings, and handles bookings seamlessly.
It solves core problems with proprietary scheduling tools like lack of customization, data lock-in, and limited team features. Cal.com is built for individuals taking calls, businesses and teams needing collaborative scheduling, agencies, influencers, SaaS founders, and developers who want to self-host or integrate open scheduling.
The project was built as an open-source successor to Calendly to give users full ownership of their data, workflows, and appearance, with a mission to connect a billion people through better scheduling by 2031. It's privacy-focused, white-label by design, and scales from solo users to enterprises.
✨ Key Features
- Calendar sync and availability management with buffers, limits, and cross-referencing to avoid double-bookings (essential for reliable scheduling)
- Custom event types (video via Cal Video/Daily.co, phone, in-person), payments (Stripe/PayPal), 65+ languages, and automated SMS/email reminders
- Team scheduling: round-robin, collective events, routing, sub-teams (on paid plans)
- Embeddable booking pages, API-driven integrations (100+ apps), browser extension, mobile app
- Optional: Enterprise features like SSO, HIPAA, custom hosting; v6.3 recently launched with enhancements
🛠 Tech Stack
- Frontend: Next.js, React, Tailwind CSS
- Backend: Node.js, tRPC
- Database: PostgreSQL, Prisma
- Auth: NextAuth.js
- Hosting: Vercel, Docker self-hosting, Render, Railway
👥 Who Is This For?
This project is useful for:
- Developers who want to self-host customizable scheduling or build on open infrastructure
- Teams looking for round-robin, routing, and collaborative booking tools
- Indie makers building customer-facing scheduling in their apps or sites
📸 Screenshots / Demo
- Live demo: https://cal.com
- GitHub: https://github.com/calcom/cal.com
🔥 Project Status
- 🟢 Actively building
Last updated: 2026-03-24
❓ FAQ
Is this project free?
Freemium — Free forever for individuals (unlimited events, calendars, integrations, payments); Teams $12/user/mo, Organizations $28/user/mo, Enterprise custom. Self-hosting open-source core is free.
Is the source code available?
Yes — https://github.com/calcom/cal.com (AGPLv3 core; Enterprise Edition features under commercial license)
Can I contribute?
Yes — Review CONTRIBUTING.md, submit PRs/issues on GitHub, join Discussions, tackle 'good first issue' labels, or provide feedback in community channels.
📬 Contact & Links
- Website: https://cal.com
- GitHub: https://github.com/calcom/cal.com
- Twitter/X: https://x.com/calcom
- Email: support@cal.com
Built with ❤️ and kept warm on WarmIndex.
Similar apps
Home - Gancio
gancio.org
Gancio is a shared agenda for local communities.
Buddi Trip – Travel Planner, Budget & Itinerary Organizer
budditrip.com
Buddi Trip – plan trips effortlessly, track expenses, build itineraries, manage packing lists, and explore AI-powered travel suggestions.
Desk sharing, room reservation, free seating & co-working | Seatsurfing
seatsurfing.app
Desk sharing, room reservation, free seating, and co-working for enterprises.
Open Source and Free Hotel Booking Management Software - QloApps
qloapps.com
QloApps is free and open-source software that launches a multilingual/multicurrency hotel reservation and booking Website within a few minutes. QloApps allows you to take and manage both on-desk and online hotel bookings.