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
What users say
Write a reviewNo user reviews yet. If you’ve used GridCraft, share what you used it for and how it went.
Last updated 16 October 2026. Facts checked against the official site on 16 October 2026. How we make money