head to head · open source
IronCalc vs Collabora Online
IronCalc has 4,246 GitHub stars, 217 forks, 256 open issues and last shipped yesterday. Collabora Online has 3,389 stars, 1,014 forks, 874 open issues and last shipped 7 days ago. IronCalc leads on adoption by 25% (4,246 vs 3,389 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 5% as many forks as stars, Collabora Online 30%. IronCalc 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 20902 open source comparisons
Side by side
| IronCalc | Collabora Online | |
|---|---|---|
| GitHub stars | ★ 4.2K | ★ 3.4K |
| License | Apache-2.0 | Custom / other |
| Written in | Rust | Shell |
| Last push | 2026-11-02 | 2026-10-27 |
| Forks | ⑂ 217 | ⑂ 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 [![MIT licensed][mit badge]][mit url] [![Apache 2.0 licensed][apache badge]][apache url] [![Build Status][actions badge]][actions url] [![Code coverage][codecov badge]][codecov url] [![docs badge]][docs url] [![Discord chat][discord badge]][discord url] [mit badge]: [mit url]: [apache badge]: [apache url]: [codecov badge]: [codecov url]: [actions badge]: [actions url]: [docs url]: [docs badge]: [discord badge]: [discord url]: IronCalc is a new, modern, work in progress spreadsheet engine and set of tools to work with spreadsheets in diverse settings. This repository contains the main engine and the xlsx…
read the full IronCalc overview →
About Collabora Online
Collabora Online [!IMPORTANT] About this repository. Active development of Collabora Online has moved to our Gerrit instance at which is where the source code and code review live. This GitHub repository is kept for: Issue tracking — please report bugs and request features here. Release artifacts — the nightly container image, the Helm chart, and build assets are published from here. Source code changes go to Gerrit, not GitHub. Follow CONTRIBUTING.md and push to Gerrit instead. Pull requests here are welcome only for the parts this repository owns — the Helm chart and the docker image build. A read only mirror…
read the full Collabora Online overview →
More in Productivity & Utilities
Related comparisons
More Office Suites projects
Compare either of these against the rest of the Office Suites field.
Frequently asked questions
Is IronCalc or Collabora Online more popular?
IronCalc has 4,246 GitHub stars and Collabora Online has 3,389. 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 (4,246 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.