Cal.com

What Is Cal.com?

Cal.com (formerly Calendso) is an open-source scheduling platform that gives individuals and teams a link-based booking system. It connects to your calendar (Google, Outlook, iCal), lets you define availability, and gives you a shareable URL where people can book time with you. Think Calendly — but open, extensible, and self-hostable.

Who Is It For?

Consultants, coaches, sales teams, support reps, and anyone who spends time sending "when are you free?" emails. For developers specifically, the API-first approach makes it embeddable in any product — turn any SaaS into one with built-in scheduling.

Standout Features

• Event types: One-on-one, round robin, collective (all attendees at once), or custom. Duration, location (Zoom, Meet, phone, in-person), buffer times, and limits are all configurable.
• Team scheduling: Route bookings to available team members based on load balancing or round-robin rules.
• Routing forms: Qualify leads before they book — ask questions and route them to the right calendar based on answers.
• Workflows: Send automated reminders (email, SMS via Twilio) before and after meetings without a third-party tool.
• Embeds: Embed a booking flow into any website inline, as a popup, or as a floating button. Customizable to match your brand.
• Apps marketplace: Integrates with Stripe (paid bookings), HubSpot, Salesforce, Zapier, and 50+ tools.
• Self-hosting: Full source code on GitHub. Docker Compose setup, actively maintained.

Limitations

• The admin dashboard UX can be overwhelming at first — there's a lot of surface area.
• SMS workflows require a Twilio account (separate cost).
• Self-hosting means you manage upgrades, which happen frequently.

Pricing

Free tier includes 1 calendar connection and core features. Teams plan at $15/user/mo. Enterprise pricing available. Self-hosting is free.

Verdict

Cal.com has outpaced Calendly on features while remaining free for individuals. The API-first approach and self-hosting option make it the obvious choice for developers who want scheduling embedded in a product. For individuals, the free tier is more than enough.