Gridpark — Make Excel playgrounds

What it does

Gridpark is a free, open-source desktop spreadsheet that reads and writes realxlsx files, reasonably compatible with Excel. Powered by HyperFormula's 400+ formula functions. A full styling toolbar covers fonts, colors, borders, number formats, and cell merge. The twist: you can draw directly on your spreadsheet. Pen, highlighter, spray can, eraser, annotate your data like it's a wall. Dark/light themes, Japanese + English UI, sort, filter, freeze rows, undo/redo, autosave.

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