The Open Source Alternative to Calendly & Google Calendar

🩺 Vitals

📦 Version: v6.1.9 (Released 2026-01-30)
🚀 Velocity: Active (Last commit 2026-01-30)
🌟 Community: 39.9k Stars · 11.7k Forks
🐞 Backlog: 1349 Open Issues

🏗️ Profile

Official: cal.com
Source: github.com/calcom/cal.com
License: AGPL-3.0
Deployment:Docker / Kubernetes
Data Model: Postgres (Prisma)
Jurisdiction: USA 🇺🇸
Compliance: SOC 2 Type II, ISO 27001, HIPAA, GDPR, CCPA
Complexity: Moderate (3/5) - Full Stack App
Maintenance: Moderate (3/5) - Active Development
Enterprise Ready: High (4/5) - White-label, API-first, SSO

1. The Executive Summary

What is it? Cal.com is an open-source scheduling platform built as infrastructure. It provides a powerful, customizable booking experience similar to Calendly but with total control over your data, workflow, and brand. It is designed to be embedded, extended, and white-labeled.

The Strategic Verdict:

🔴 For Simple Personal Use: Caution. Self-hosting is complex for a single user. Use the hosted Free tier.
🟢 For Enterprise & White-Label: Strong Buy. The "Infrastructure as Code" approach allows you to build entire scheduling businesses on top of it.

2. The "Hidden" Costs (TCO Analysis)

Cost Component	Proprietary (Calendly)	Cal.com (Self-Hosted)
License Fee	~$12-16/user/mo	$0 (AGPLv3)
Brand Control	"Powered by Calendly"	100% Your Brand
Infrastructure	$0	~$30/mo (VPS)

3. The "Day 2" Reality Check

🚀 Deployment & Operations

Installation:Docker Compose is the standard. Requires Postgres.
Scaling: Built on Next.js and Prisma, scales horizontally well.

🛡️ Security & Governance

Compliance: SOC 2 Type II, ISO 27001, HIPAA, GDPR, CCPA
License: AGPL-3.0 ensures any modifications to the core platform are shared back if offered as a service.

Cal.com