Show HN: Extend UI – open-source UI kit for modern document apps

Category: library

Tags: react, ui-kit, document-viewer, pdf-viewer, shadcn

Score: 7.0/10 (Innovation: 6, Technical: 7, Documentation: 8, Utility: 7)

Extend UI provides an open-source, MIT-licensed React component library specialized for document-heavy applications, including PDF/DOCX/XLSX viewers, bounding box citations, e-signature, and file browsing. Its tight integration with shadcn and focus on production-grade, customizable components for document processing workflows fills a clear gap for teams building document agents, review tools, or internal file management interfaces.

Target audience: frontend devs, backend devs, data engineers

Repository: https://www.extend.ai/ui · TypeScript · NOASSERTION · 277 stars

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