IronCalc

Open-source Rust spreadsheet engine with .xlsx support, 300+ functions, and JS/Python bindings.

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An open-source spreadsheet engine written in Rust that can be embedded or self-hosted, with .xlsx compatibility, 300+ built-in functions, and bindings for JavaScript and Python. It provides a non-proprietary core for developers, analysts, and spreadsheet users who need an embeddable alternative to commercial spreadsheets and want to avoid vendor lock-in. Not designed for teams that require real-time multiplayer cloud sheets.

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