head to head · open source
Cal.com vs Anki
Cal.com has 49,651 GitHub stars, 15,521 forks, 1,432 open issues and last shipped yesterday. Anki has 32,488 stars, 3,393 forks, 512 open issues and last shipped 5 days ago. Cal.com leads on adoption by 53% (49,651 vs 32,488 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%. Cal.com 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.
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Side by side
| Cal.com | Anki | |
|---|---|---|
| GitHub stars | ★ 50K | ★ 32K |
| License | MIT | Custom / other |
| Written in | TypeScript | Rust |
| Last push | 2026-11-02 | 2026-10-29 |
| Forks | ⑂ 16K | ⑂ 3.4K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Cal.com if
- You weight community size — 50K 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
[!WARNING] Use at your own risk. Cal.diy is the open source community edition of Cal.com and it is intended for users who want to self host their own Cal.diy instance. It is strictly recommended for personal, non production use. Please review all installation and configuration steps carefully. Self hosting requires advanced knowledge of server administration, database management, and securing sensitive data. Proceed only if you are comfortable with these responsibilities. [!TIP] For any commercial and enterprise ready scheduling infrastructure, use Cal.com, not Cal.diy; hosted by us or get invited to on prem…
read the full Cal.com overview →
About Anki
Anki This repo contains the source code for the computer version of Anki. About Anki is a spaced repetition program. Please see the website to learn more. Getting Started Contributing Want to contribute to Anki? Check out the Contribution Guidelines. For more information on building and developing, please see Development. Contributors The following people have contributed to Anki: CONTRIBUTORS Anki Betas If you'd like to try development builds of Anki but don't feel comfortable building the code, please see Anki betas. License Anki's license: LICENSE
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Frequently asked questions
Is Cal.com or Anki more popular?
Cal.com has 49,651 GitHub stars and Anki has 32,488. 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 (49,651 stars) or its MIT licence terms. Choose Anki if its feature set, stack or Custom / other licence fits better. Both are self-hostable.