Cal.com

Cal.com is a scheduling platform that lets people share booking links so others can reserve time without back-and-forth email. It connects to calendars to prevent double bookings, and supports multiple event types, buffers, availability rules, team routing, and built-in video links, plus an API and embeds for developers.

It is built for individuals, teams, and companies that want scheduling they can customise, embed, and even self-host rather than rely on a closed service. As an open-source alternative to proprietary tools, it appeals to developers and privacy-minded organisations who value transparency and control over their booking flows.

Cal.com is free for individuals to self-host or use in the cloud, with paid team and enterprise plans plus a white-label platform for embedding scheduling into other products. Founded in 2021 as Calendso by Peer Richelsen and Bailey Pumfleet, it rebranded to Cal.com the same year.