Cal.diy vs Rallly
Cal.diy and Rallly are both booking and scheduling software. Cal.diy is open source under MIT, with 50k GitHub stars. Rallly is open source under AGPL-3.0, with 5.3k GitHub stars.
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 Rallly when
- You often coordinate meetings or events with people outside your organisation and want an ad-free Doodle replacement.
Side by side
Cal.diy, the fully MIT-licensed community edition of Cal.com for booking pages and scheduling, with enterprise features removed.
A meeting poll tool, like Doodle, where people vote on proposed dates and times without creating accounts.
Teams, workflows, SSO and other enterprise features are removed, and the project itself recommends it only for personal, non-production use.
Some features are reserved for the paid hosted plan, and the app is AGPL licensed.
Usable
Production-ready
Self-hosted server
Self-hosted server and cloud service
TypeScript, Next.js, Prisma, tRPC and PostgreSQL
TypeScript, Next.js, Prisma and PostgreSQL
Open source, MIT (permissive)
Open source, AGPL-3.0 (network copyleft)
You can build it into a product you sell, as long as you keep its copyright notice.
Use inside your business is unrestricted. If you change it and let customers use it over the internet, you must publish your changes.
50k GitHub stars
5.3k GitHub stars
Established: started 5 years ago, latest release v6.2.0.
Established: started 11 years ago, latest release untagged-6490d7892bf741592dba.
Other comparisons
More booking and appointment scheduling tools
Both sides were judged on 2026-11-03 from each project's README and GitHub data. License, age and popularity lines are worked out directly.