Cal.com API is the developer-focused infrastructure for the Cal.com scheduling platform. It provides programmable access to calendar synchronization, event booking, and availability management, allowing developers to build custom scheduling workflows into their own applications. Unlike proprietary competitors, it is built on an open-source core with a focus on extensibility and data sovereignty.
Brand Authority Index (BAI): 72/100
Archetype: Challenger
Category: Software Development Tools
https://optimly.ai/brand/cal-com-api-open-source
Last analyzed: April 10, 2026
Founded: 2021
Headquarters: Remote / Peerric (Peer Richelsen & Bailey Pumfleet)