Show HN: Webcellar – JavaScript (and TypeScript) in Excel Made Simple

Category: devtools

Tags: excel, office-addin, typescript, spreadsheet, automation

Score: 5.8/10 (Innovation: 6, Technical: 5, Documentation: 7, Utility: 5)

Webcellar is an open-source Office Add-In for Excel that allows developers to embed custom JavaScript/TypeScript modules directly into spreadsheets, with exports automatically becoming callable functions. It's interesting because it provides a local, security-hardened alternative to standard Office Add-Ins, enabling per-workbook custom logic for complex models like forecasting and AI while handling data type and dimensionality conversions automatically.

Target audience: backend devs, data engineers

Repository: https://github.com/Acmeon/Webcellar · TypeScript · MIT

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