Calendly

Calendly simplified meeting scheduling — share a link, let people book your available times. But its pricing ($12/seat/month for Standard) and limited customization options have opened the door for Cal.com, the open source alternative that matches Calendly's core features while adding developer-friendly flexibility.

Cal.com provides everything Calendly does — event types, calendar sync, timezone detection, buffer times, and booking pages — plus advanced features like round-robin scheduling, collective scheduling, and custom workflows with webhooks. The self-hosted version is free with no seat limits, making it dramatically cheaper for teams. Rallly rounds out the options as a focused meeting poll tool (similar to Doodle) for finding times that work for groups.

For developer-focused companies, Cal.com's open source nature is a significant advantage. You can customize the booking flow, embed it in your product, white-label it for clients, and integrate it with internal systems via its API. Calendly's customization is limited to what their admin panel offers.

The booking experience for end users is nearly identical between Calendly and Cal.com — both show available times, handle timezone conversion, and send confirmation emails. The difference is behind the scenes: Cal.com gives you full control over the infrastructure, branding, and workflow logic.