Cal.com

Cal.com is one of the most-cited "open-source Calendly alternative" SaaS products of the past few years — founded in 2021 by Peer Richelsen (German) and Bailey Pumfleet (UK), with the commercial entity incorporated as **Cal.com, Inc.** in **San Francisco, California** despite the EU-founder origin. The company has raised approximately **US$32M** in venture funding and the GitHub repository (calcom/cal.com) has accumulated more than 41,000 stars since launch. The product replaces Calendly's hosted scheduling experience with a self-hostable, AGPLv3-licensed open-source codebase plus a managed SaaS (cal.com) — a model that was the directory's reference "EU founders bringing US-style SaaS open-source pressure" story until 2026. The 2026 strategic shift complicates the listing. Per public reporting and direct corporate communication, Cal.com is **moving its production codebase behind closed doors** during 2026, leaving only a stripped community edition called **Cal.diy** under the more-permissive **MIT licence** — while rewritten authentication, data-handling, and commercial systems become proprietary. This narrows the structural "fork-if-anything-changes" guarantee that historically distinguished Cal.com from Calendly. For procurement-grade EU buyers the picture is now: (a) the hosted Cal.com SaaS is US-incorporated under Cal.com, Inc. and subject to US extraterritorial law by default — `direct` CLOUD Act exposure under our strict-ownership stance; (b) the privacy policy explicitly confirms data transfers to the United States, with US sub-processors Stripe, Twilio, and Daily.co alongside PostHog (UK); (c) the Cal.diy MIT community edition on EU infrastructure (Hetzner, OVHcloud, Scaleway) remains a legitimate self-host option but with reduced feature parity vs the proprietary hosted product. Pricing for the hosted SaaS is freemium with paid Team and Enterprise tiers; specific entry-tier EUR figures were not captured at audit. Best fit: developers and product builders who specifically want the Cal.com API surface and accept US-incorporation; teams comfortable with the new MIT/Cal.diy self-host path on EU infrastructure for sovereignty. Procurement-grade EU-only buyers needing a structurally EU-incorporated alternative should choose Doodle (CH, TX Group), SuperSaaS (NL, founder-owned), or Reservio (CZ, ABUGO Group) instead — all listed elsewhere in this category.