Developer Open-Sources Rust-Based Spreadsheet Engine After Years of Solo Work

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A developer has released an open-source spreadsheet platform built largely during evenings and weekends, following the shutdown of a company where the original idea took shape. The project stems from a real-world problem: businesses managing hundreds of near-identical Excel files that gradually diverged due to manual edits, making backend data validation unreliable. At its core are Rust libraries handling formula calculation, OOXML compatibility, undo/redo, and workbook manipulation, designed to run independently of any frontend. Two key concepts called Block and Craft allow users to define stable data structures within workbooks and extend functionality with custom business logic, similar to how VS Code uses extensions. The developer credits AI tools with significantly accelerating solo progress, helping the project reach the scope originally envisioned years ago.

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