Extend UI
Open-source React UI kit for document apps — PDF, DOCX, XLSX, and CSV viewers with citations and e-signing built in.
Opens extend.ai in a new tab.
How the 7.0 was reached
- Quality of output6/10
14 components used in production by the vendor; 1,569 stars, 86 forks, active; licence flagged unclear. Source: github.com
- Ease of use8/10
Install via shadcn CLI as source, with docs and examples. Source: github.com
- Pricing value8/10
Components are free and MIT-licensed; the paid document APIs have pay-as-you-go with 10,000 free credits. Source: extend.ai
- API and integration quality7/10
React components plus Parse, Extract, Classify, Split and Edit APIs on all plans; SDK details not shown. Source: extend.ai
- Solves the problem it claims to solve6/10
Provides PDF, DOCX and XLSX viewers as claimed; repo adoption is modest and CSV viewer is not confirmed in the component list. Source: github.com
7.0/10 is the average of the five criterion scores above. The evidence comes from 2 different sources.Scores come from public evidence (the tool's own pages and documentation, and independent reviews); we do not test every tool hands-on. Scored 29 September 2026, on version 1 of our five-criteria scoring method.
Pricing
- All components free
- MIT license
- Self-hosted
- GitHub source access
For the full list of what each plan includes, and current prices, see extend.ai.
Key Features
- PDF, DOCX, XLSX, and CSV viewer React components
- Bounding box citation overlays for AI-grounded document UIs
- File upload and file system browser components
- E-signing component for document workflows
- Schema builder and document splits view
- Drop-in ready for agent pipelines and internal tools
Pros & Cons
Pros
- Fully open source with ~1.4k GitHub stars at launch
- Covers all major document formats in one kit
- Citation/bounding-box support is rare and directly useful for RAG and AI document apps
- Ready for agent or user-facing flows without custom wiring
Cons
- React-only — no Vue, Angular, or web-component variants
- Maintained by Extend AI, so roadmap may favor their own product needs
- Niche scope limits reuse outside document-centric apps
- No hosted or managed option — purely a self-integrated library
Extend UI fills a real gap: document viewer components that understand AI citations and agent contexts, not just passive file rendering. For teams building RAG interfaces, document automation, or internal tools around PDFs and spreadsheets, it's a meaningful head start. The React-only constraint and Extend AI stewardship are the main reasons to evaluate longevity before committing.
Added to scored.tools on
For the Extend UI team: put this score on your website
A small image (a badge) that shows this score and links back to this page. Free for any tool, at any score. It always shows the current score, so it changes when the score does. Copy this code into your website where you want the badge:
<a href="https://scored.tools/tools/extend-ui/"><img src="https://scored.tools/badge/extend-ui.svg" alt="Extend UI on scored.tools: 7.0/10" width="160" height="40"></a>Do you work for Extend UI? Claim this page: prove you work there, then confirm the facts, correct a mistake or add a short reply. It is free and never changes the score.
Competitors to Extend UI
Other tools in the Coding category worth comparing.
v0 by Vercel
6.4/10Go from text prompt to full-stack web app in seconds — deploy live to Vercel with one click.
CopilotKit
7.6/10Open-source framework for building AI-powered agentic applications with copilot interfaces.
Gradio
8.2/10Build and share machine learning web apps in Python with zero frontend experience required