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7/24/2026
Another Web Spreadsheet App?

Another Web Spreadsheet App?

Short summary

A developer recounts building an open-source spreadsheet engine in Rust after a previous startup failed. The project introduces Block (stable data structures inside workbooks) and Craft (a VS Code-style extension system for custom business logic). AI accelerated solo development, turning a years-long side project into a functional product with formula calculation, OOXML support, and automation capabilities.

  • •Open-source Rust spreadsheet engine with formula calculation and OOXML compatibility
  • •Block defines stable structures inside workbooks; Craft adds extensible business logic via JS
  • •AI dramatically increased solo developer throughput on a complex engineering project

Generated with AI, which can make mistakes.

#open-source#ai-tools
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