Cal.com
Open-source scheduling platform founded by German entrepreneur Peer Richelsen. Self-hostable Calendly alternative with deep integrations. Incorporated in California despite European roots.
Quick facts
Why does it score 37?
Cal.com is legally incorporated in California, despite its co-founder's German background.
Cal.com has raised venture funding, including a $32M seed and Series A, with no single non-EU parent holding a controlling stake.
Cal.com is hosted on AWS in the US by default; self-hosting on European infrastructure is the alternative path.
Cal.com is fully open source and self-hostable.
See how they compare
Cal.comWhat does it replace?
Calendly 
Acuity Scheduling More European Scheduling & booking alternatives
Swiss scheduling tool that makes it easy to find a meeting time that works for everyone, using simple group polls and booking pages. No account required for participants. Founded in Zürich in 2007 and owned by Swiss Post, a state-backed organisation fully owned by the Swiss Confederation, keeping your scheduling data in Swiss hands.