head to head · open source
Cal.com vs Anki
Cal.com has 48,529 GitHub stars, 15,154 forks, 1,432 open issues and last shipped 4 days ago. Anki has 30,973 stars, 3,220 forks, 512 open issues and last shipped yesterday. Cal.com leads on adoption by 57% (48,529 vs 30,973 stars). Cal.com is written in TypeScript under MIT; Anki is written in Rust under a custom or non-standard licence. Cal.com has attracted 31% as many forks as stars, Anki 10%. Anki was the more recently maintained of the two, and both are self-hostable with no licence fee.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
← all 8884 open source comparisons
Side by side
| Cal.com | Anki | |
|---|---|---|
| GitHub stars | ★ 49K | ★ 31K |
| License | MIT | Custom / other |
| Written in | TypeScript | Rust |
| Last push | 2026-09-14 | 2026-09-17 |
| Forks | ⑂ 15K | ⑂ 3.2K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Cal.com if
- You weight community size — 49K stars and counting
- You want the MIT license terms
- Your stack matches TypeScript
- You value the larger contributor base for long-term maintenance
pick Anki if
- You want the Anki feature set and don't need the biggest community
- You prefer the Custom / other license terms
- Your stack matches Rust
- You evaluated both and Anki fits your workflow better
About Cal.com
Cal.diy is a fully open source, community maintained fork of Cal.com, stripped of all enterprise and commercial features. It provides a self hosted scheduling platform built on the T3 stack (Next.js, tRPC, Prisma, Tailwind CSS, Zod), licensed under MIT with no proprietary code or license keys required.
read the full Cal.com overview →
About Anki
Anki is a spaced repetition flashcard program that schedules review of items based on memory performance, ensuring long term retention with minimal effort. It lives in the cross platform desktop and mobile education software ecosystem, with a primary focus on the computer version hosted at apps.ankiweb.net. The project is maintained by ankitects and distributed under a NOASSERTION license, meaning no explicit license terms are declared in the repository.
More in Business Software
Related comparisons
More Scheduling & Event Management projects
Compare either of these against the rest of the Scheduling & Event Management field.
Frequently asked questions
Is Cal.com or Anki more popular?
Cal.com has 48,529 GitHub stars and Anki has 30,973. Cal.com has the larger community by that measure.
Are Cal.com and Anki free?
Both are open source. Cal.com is licensed under MIT, and Anki has no licence declared in this registry. Both are free to self-host.
What is the difference between Cal.com and Anki?
Cal.com is written in TypeScript and Anki in Rust. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, Cal.com or Anki?
Choose Cal.com if you want the larger community (48,529 stars) or its MIT licence terms. Choose Anki if its feature set, stack or Custom / other licence fits better. Both are self-hostable.