The Free, Open-Source Calendly Alternative
Calendly pioneered online scheduling and does it brilliantly. GudCal brings the same power with open source, AI agent support, and zero per-seat costs.
What Calendly Does Well
We respect what Calendly has built. Here's where they shine.
Where GudCal Goes Further
Calendly is great, but here's what you get with GudCal.
Truly Free
3 event types, unlimited bookings, and calendar sync on the free tier. No per-seat charges.
Open Source (GPL-3.0)
Full source code on GitHub. Audit it, modify it, contribute to it. No vendor lock-in.
AI Agent Ready
Built-in MCP server lets any AI agent discover availability and book meetings autonomously.
Self-Hostable
Deploy on your own infrastructure. Your data never leaves your servers.
Developer-First API
Every feature works through the REST API. Webhooks for every booking event.
Modern Stack
Built with Next.js 16, React 19, PostgreSQL, and Tailwind CSS. Clean, extensible codebase.
Common Calendly Limitations
- Per-seat pricing gets expensive for growing teams — Professional plan starts at $12/seat/month
- Free tier limited to one event type, making it impractical for most users
- No self-hosting option — your data lives on Calendly's servers
- No native AI agent or MCP integration — custom API work needed for every AI workflow
- Closed source — you cannot audit the code or customize the platform
- API rate limits and access restricted on lower tiers
Feature Comparison
| Feature | Calendly | GudCal |
|---|---|---|
| Free event types | 1 | 3 |
| Unlimited bookings | ||
| Calendar sync | ||
| Custom booking pages | ||
| Team scheduling | Paid | |
| Open source | ||
| Self-hostable | ||
| MCP / AI agent support | ||
| REST API | Paid | |
| Webhooks | Paid | |
| Per-seat pricing | $12+/seat | Free |
| SSO / SCIM | Enterprise | Roadmap |
Ready to Try GudCal?
Free to use, open source, and self-hostable. No credit card required.