head to head · open source
IronCalc vs Collabora Online
IronCalc has 4,163 GitHub stars, 183 forks, 256 open issues and last shipped yesterday. Collabora Online has 3,351 stars, 1,019 forks, 874 open issues and last shipped yesterday. IronCalc leads on adoption by 24% (4,163 vs 3,351 stars). IronCalc is written in Rust under Apache-2.0; Collabora Online is written in Shell under a custom or non-standard licence. IronCalc has attracted 4% as many forks as stars, Collabora Online 30%. Collabora Online 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
| IronCalc | Collabora Online | |
|---|---|---|
| GitHub stars | ★ 4.2K | ★ 3.4K |
| License | Apache-2.0 | Custom / other |
| Written in | Rust | Shell |
| Last push | 2026-09-17 | 2026-09-17 |
| Forks | ⑂ 183 | ⑂ 1.0K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick IronCalc if
- You weight community size — 4.2K stars and counting
- You want the Apache-2.0 license terms
- Your stack matches Rust
- You value the larger contributor base for long-term maintenance
pick Collabora Online if
- You want the Collabora Online feature set and don't need the biggest community
- You prefer the Custom / other license terms
- Your stack matches Shell
- You evaluated both and Collabora Online fits your workflow better
About IronCalc
IronCalc is a spreadsheet engine and set of tools. It is the main engine of the IronCalc ecosystem, and it lives in the Rust open source spreadsheet ecosystem. The project provides a work in progress engine, an xlsx reader, and an xlsx writer. It is designed to be embedded, self hosted, or run in the browser.
read the full IronCalc overview →
About Collabora Online
Collabora Online is an open source document editing suite for secure collaboration, and it sits in the productivity and office suite category. The repository metadata presents it as a suite for documents, office work, and enterprise use, with topics that connect it to LibreOffice, JavaScript, C++, Android, and iOS. Active development and code review happen on a Gerrit instance, while the GitHub repository is kept for issue tracking and release artifacts.
read the full Collabora Online overview →
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Frequently asked questions
Is IronCalc or Collabora Online more popular?
IronCalc has 4,163 GitHub stars and Collabora Online has 3,351. IronCalc has the larger community by that measure.
Are IronCalc and Collabora Online free?
Both are open source. IronCalc is licensed under Apache-2.0, and Collabora Online has no licence declared in this registry. Both are free to self-host.
What is the difference between IronCalc and Collabora Online?
IronCalc is written in Rust and Collabora Online in Shell. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, IronCalc or Collabora Online?
Choose IronCalc if you want the larger community (4,163 stars) or its Apache-2.0 licence terms. Choose Collabora Online if its feature set, stack or Custom / other licence fits better. Both are self-hostable.