Cal.com Has a Free API That Adds Scheduling to Any App

Cal.com is the open-source scheduling platform. Its API lets you embed booking, manage availability, and handle events programmatically. Embed: Add Booking to Your Site <!-- Inline embed --> <cal-inline calLink= "username/meeting-type" ></cal-inline> <script src= "https://app.cal.com/embed/embed.js" ></script> // React embed import Cal from " @calcom/embed-react " ; function BookingPage () { return ( < Cal calLink = " username/30min " style = {{ width : " 100% " , height : " 100% " }} config = {{ layout : " month_view " , theme : " light " }} / > ); } REST API: Full Control const CAL_API = " https://api.cal.com/v1 " ; const API_KEY = process . env . CAL_API_KEY ; // List event types const eventTypes = await fetch ( ` ${ CAL_API } /event-types?apiKey= ${ API_KEY } ` ). then ( r => r . json ()); // Get availability const availability = await fetch ( ` ${ CAL_API } /availability?apiKey= ${ API_KEY } &dateFrom=2026-03-29&dateTo=2026-04-05&eventTypeId=123` ). then ( r => r . json ()); // Cr