@extend

Promising 76/100 · #60 of 342 scored

A collection of UI components for building document agents and human-in-the-loop review workflows.

@extend is a shadcn UI community registry. Its source repository is extend-hq/ui , which has 1.6k GitHub stars, 86 forks and 5 contributors. The last commit was 17d ago (36 commits in the last 90 days). It scores 76/100 on Sealambda's maturity index, placing it in the Promising tier.

Scoring

Maturity breakdown

76 / 100 · Promising

0avoid · 305080 · reliable100

new confidence 100% · weight backed by data

Maintenance ×35% 87 → +30.4

last commit 17d ago · 36 commits/90d · solo maintainer

Popularity ×20% 91 → +18.2

1.6k★ · 86 forks

Community ×20% 55 → +11.0

5 contributors · bus factor 1 · 6 watching

Responsiveness ×13% 77 → +10.0

10/13 issues closed (77%)

Hygiene ×12% 50 → +5.9

license (unrecognized) · 25% health files

Signals

Repository facts

1.6k
Stars: 86
Forks: 5
Contributors: 1
Bus factor: 3
Open issues: 10
Closed issues: 36
Commits (90d): TypeScript
Language: present (unrecognized)
License: —
Latest version: none
Releases: 17d ago
Last commit

Classification

License, pricing and purpose

License: Unrecognized license; Unrecognized license: A license file GitHub could not match to a known license.
Access: Custom license; A license GitHub could not recognize (often custom, commercial or source-available): read it before use.
Purpose: An open-source collection of components and blocks for document viewers, OCR inspection, file management, and human-in-the-loop document workflows.
Commercial model: Free; Everything the project offers is free to use, with no paid tier. Donations and sponsorships do not count as paid.
Tied to a service: No; Yes when the components are a client for a commercial API or service.
Scope: Domain-specific; Focused on one problem area, such as charts, AI chat, an editor, a status page or payments; an app adds it for that feature only.
Domains: File upload, Media, Docs & content; File upload: File upload, dropzones and file management. Media: Audio, video, image galleries and media players. Docs & content: Documentation sites, blogs and content rendering.
Design: Vanilla shadcn; Looks like default shadcn/ui: the same shapes, spacing, borders and neutral palette, at most with another accent color.
Coverage: 44%; Share of shadcn/ui core primitives that the registry ships.
Design distance: 0.82; Measured on sample items: 0 is identical to vanilla shadcn/ui, 1 is entirely different.

Evidence

“Extend UI is a set of open-source components for document agents, user-facing document flows, and internal tools.”
commercial · readme ↗
“Components are fully customizable, MIT licensed, and available through the shadcn component registry.”
commercial · readme ↗
“The library includes 14 components and examples for PDF, DOCX, and XLSX viewers, plus bounding box citations, file upload, file thumbnails, e-signature, document splitting, layout blocks”
scope · readme ↗
“React components for PDF, DOCX, XLSX, and CSV viewers, with bounding box citations, file upload, e-signing, and more.”
domains · homepage ↗
“Configure the style-aware registry in your `components.json`: ```json { "registries": { "@extend": "https://www.extend.ai/ui/r/styles/{style}/{name}.json" } } ```”
design · readme ↗

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Usage

Install

Add components from this registry with the shadcn CLI (configure the registry URL in your components.json):

pnpm dlx shadcn@latest add @extend/[component]

endpoint: https://ui.extend.ai/r/{name}.json

Homepage ↗ GitHub ↗

README

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