Cal.diy vs Calendly
Cal.diy and Calendly are both booking and scheduling software. Cal.diy is open source under MIT, with 50k GitHub stars. Calendly is a commercial product from Calendly.
Which to pick
- Pick Cal.diy when
- You want to self-host personal booking links without a Cal.com licence and can run Next.js with Postgres.
- Pick Calendly when
- Sales, recruiting or consulting staff spend time on back-and-forth emails to book meetings.
Side by side
Cal.diy, the fully MIT-licensed community edition of Cal.com for booking pages and scheduling, with enterprise features removed.
Meeting scheduling links that check your calendar availability, with round-robin team scheduling, payments, reminders and CRM integration.
Teams, workflows, SSO and other enterprise features are removed, and the project itself recommends it only for personal, non-production use.
Team features and integrations need paid seats.
Usable
Production-ready
Self-hosted server
Cloud service, mobile app and browser extension
TypeScript, Next.js, Prisma, tRPC and PostgreSQL
Not published
Open source, MIT (permissive)
Closed source, sold by Calendly
You can build it into a product you sell, as long as you keep its copyright notice.
Closed source: you use it under the maker's terms and cannot change or resell the code.
50k GitHub stars
1k Wikipedia readers a month on phones
Established: started 5 years ago, latest release v6.2.0.
Not known
Other comparisons
More booking and appointment scheduling tools
Both sides were judged on 2026-11-03 from makers' descriptions, Wikipedia, READMEs and GitHub data. License, age and popularity lines are worked out directly.