head to head · open source
cap vs proton-lumo
cap has 22,381 GitHub stars, 1,918 forks, 339 open issues and last shipped yesterday. proton-lumo has 5,590 stars, 711 forks, 155 open issues and last shipped yesterday. cap leads on adoption by 300% (22,381 vs 5,590 stars). cap is written in Rust under a custom or non-standard licence; proton-lumo is written in TypeScript under GPL-3.0. cap has attracted 9% as many forks as stars, proton-lumo 13%. cap was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (react), so they are genuine substitutes rather than adjacent tools.
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
| cap | proton-lumo | |
|---|---|---|
| GitHub stars | ★ 22K | ★ 5.6K |
| License | Custom / other | GPL-3.0 |
| Written in | Rust | TypeScript |
| Last push | 2026-09-17 | 2026-09-17 |
| Forks | ⑂ 1.9K | ⑂ 711 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick cap if
- You weight community size — 22K stars and counting
- You want the Custom / other license terms
- Your stack matches Rust
- You value the larger contributor base for long-term maintenance
pick proton-lumo if
- You want the proton-lumo feature set and don't need the biggest community
- You prefer the GPL-3.0 license terms
- Your stack matches TypeScript
- You evaluated both and proton-lumo fits your workflow better
About cap
Cap open source screen recording sharing project for teams. Lives web desktop software ecosystem. Uses Rust TypeScript stack, Next.js web dashboard, desktop apps macOS Windows. Presents alternative Loom. Supports importing existing Loom videos.
About proton-lumo
Proton WebClients is a monorepo hosting the Proton web clients. It lives in the Proton ecosystem and holds the web applications, their dependencies, shared modules, and all tooling surrounding web client development. Applications inside include Proton Mail, Proton Calendar, Proton Drive, Proton Account, Proton VPN, Proton Pass, Proton Wallet, Proton Lumo, and Proton Meet. Code and data files ship under GNU General Public License version 3.
read the full proton-lumo overview →
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Frequently asked questions
Is cap or proton-lumo more popular?
cap has 22,381 GitHub stars and proton-lumo has 5,590. cap has the larger community by that measure.
Are cap and proton-lumo free?
Both are open source. cap has no licence declared in this registry, and proton-lumo is licensed under GPL-3.0. Both are free to self-host.
What is the difference between cap and proton-lumo?
cap is written in Rust and proton-lumo in TypeScript. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, cap or proton-lumo?
Choose cap if you want the larger community (22,381 stars) or its Custom / other licence terms. Choose proton-lumo if its feature set, stack or GPL-3.0 licence fits better. Both are self-hostable.