Cal.diy vs OpenTable
Cal.diy and OpenTable are both booking and scheduling software. Cal.diy is open source under MIT, with 50k GitHub stars. OpenTable is a commercial product from Booking Holdings.
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 OpenTable when
- A restaurant in a market where diners book through OpenTable wants that reservation demand.
Side by side
Cal.diy, the fully MIT-licensed community edition of Cal.com for booking pages and scheduling, with enterprise features removed.
Restaurant reservation system and diner network with table management, guest profiles and bookings from the OpenTable app.
Teams, workflows, SSO and other enterprise features are removed, and the project itself recommends it only for personal, non-production use.
Per-cover fees for network bookings add up, and OpenTable keeps the diner relationship.
Usable
Production-ready
Self-hosted server
Cloud service and mobile app
TypeScript, Next.js, Prisma, tRPC and PostgreSQL
Not published
Open source, MIT (permissive)
Closed source, sold by Booking Holdings
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.