GridCraft
Free, open-source spreadsheet, a clean-room take on Microsoft Excel.
Our verdict
GridCraft is for people who want to try a free Excel-style spreadsheet on simple workbooks. Skip it if you depend on complex XLSX files, big data sets or the rest of Microsoft 365.
What it does well
- 513 of Excel's 523 worksheet functions per its README
- Free and open source on desktop and in the browser
- Covers 89% of Excel ribbon commands in its catalog
Where it falls short
- Alpha; README estimates about 50% ready for real work
- XLSX fidelity on real files still being improved
- No .xls import yet; very large workbooks are a gap
GridCraft is a spreadsheet app written in Rust. Its README describes it as a clean-room reimplementation of Microsoft Excel.
Next on its roadmap are XLSX fidelity on real files, very large workbooks, multi-threaded recalculation, chart depth and .xls import.
Alternatives to GridCraft
Subscription that includes Word, Excel, PowerPoint, Outlook, OneNote and OneDrive cloud storage.
- Paid
Last updated 16 October 2026. Facts checked against the official site on 16 October 2026. How we make money