Free, open-source spreadsheet software with XLSX support, formulas, charts, and PivotTables, powered by Rust and WebAssembly.
GridCraft is a free, open-source spreadsheet application by ArtCraft for flexible, transparent data work. It offers an Excel-style ribbon, worksheet tabs, formula bar, formatting tools, charts, and PivotTables. Users can open, edit, and save XLSX files while keeping an original copy for safety. GridCraft runs in browsers and as a desktop app for Windows, macOS, and Linux, with a Rust and WebAssembly calculation engine. It supports more than 500 worksheet functions, including SUM, IF, dynamic arrays, LET, and LAMBDA. It is useful for budgets, dashboards, grade trackers, and reports. GridCraft is alpha software, so complex workbooks, specialist Excel functions, external data, and VBA macros may have compatibility gaps.