Claim GridCraft, the Open-Source Excel That Plugs Into Claude
GridCraft is a free spreadsheet app, rebuilt from scratch, that opens your Excel files and lets Claude fill cells, write formulas and build charts. How to install it, connect Claude in one command, and what still doesn't work
GridCraft is an open-source, clean-room rebuild of Microsoft Excel in Rust, from the ArtCraft team. It has more than 5,600 stars on GitHub, and you can hand it to Claude with a single command.
Here is what you get, how to set it up, how to keep Claude on a copy of your file, and the catch.
What you get
- A spreadsheet app with Excel's ribbon, formula bar, tables, charts, sparklines and PivotTables.
- Opens and saves .xlsx files, plus CSV and TSV. Old .xls files open with values and formulas only.
- 513 of Excel's 523 worksheet functions, including dynamic arrays, LET and LAMBDA.
- Runs on Mac, Windows and Linux, and in the browser. Licensed Apache-2.0 / MIT.
Free, for your email
Get the full setup steps + the copy-paste setup prompt
The rest of this guide (4 more sections, 1 copy-paste prompt) opens right here. The setup prompt, one paste into Claude that sets it all up, comes by email only. Use your real address.
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