Calendly is a proprietary scheduling tool that lets people book meetings against your availability, priced per user with paid tiers gating team features and integrations. As a closed SaaS product, your scheduling data and booking pages live entirely on Calendly's infrastructure.
Cal.com is the open-source alternative, built to be embeddable and self-hostable if you want scheduling infrastructure you control rather than renting.
FAQ
Is there a free, open-source alternative to Calendly?
Yes. Cal.com is open source (MIT) and free to self-host, or you can use their hosted version if you'd rather not manage infrastructure.
What's the best open-source alternative to Calendly?
Cal.com is effectively the only real open-source option here, and it directly mirrors Calendly's booking-page workflow while adding the ability to self-host or embed scheduling into your own product.
What are the top open-source alternatives to Calendly?
Browse all open-source alternatives to Calendly above, or explore the full Scheduling category for more options.