Pendium
21st.dev
21st.dev
Visibility7
Vibe94
Businesses/Software & Developer Tools/21st.dev
21st.dev
AI Visibility & Sentiment

21st.dev

21st.dev is a Y Combinator-backed platform that provides a comprehensive library of community-made UI components for developers. They offer tools like 1Code (a Cursor-like UI for Claude Code) and Magic Chat for AI-powered component generation, enabling developers to quickly discover, create, and implement beautiful interface elements.

Active Monitoring
21st.dev
Software & Developer ToolsYC25-26
AI Visibility Score
7/100

Invisible

Sentiment Score
94/100
AI Perception

Summary

21st.dev faces a critical recommendation paradox where AI models possess strong brand awareness during direct inquiries but fail to suggest the platform as a solution during active developer workflows. While Gemini provides a bridgehead with a 42% mention rate for React component queries, the brand is currently being sidelined by competitors like Aceternity and Magic UI in high-intent landing page and prototyping searches.

Value Proposition

The largest community-driven marketplace for beautiful, production-ready UI components with AI-powered tools that help developers find and generate components instantly, dramatically speeding up frontend development.

Overview

21st.dev is a Y Combinator-backed platform that provides a comprehensive library of community-made UI components for developers. They offer tools like 1Code (a Cursor-like UI for Claude Code) and Magic Chat for AI-powered component generation, enabling developers to quickly discover, create, and implement beautiful interface elements.

Mission

Empowering developers to build beautiful interfaces faster through community-driven components and AI-powered tools.

Products & Services
Community UI Component Library (1400+ components)1Code - Cursor-like UI for Claude Code and CodexMagic Chat - AI-powered component generation21st.dev MCP - Component search & creation for AI agentsThemes marketplace
Agent Breakdown

AI Platforms

How often do different AI platforms reference 21st.dev?

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Conversation Analysis

Topics

What conversations is 21st.dev included in — or excluded from?

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Buyer Personas

Personas

Who does each AI platform recommend 21st.dev to, and when?

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Programmatic Testing

Sample Conversations

We programmatically analyze questions that real customers are asking to AI agents and chatbots, extract brand mentions and sentiment, analyze every response, and synthesize the data into an action plan to increase AI visibility.

ChatGPTChatGPTClaudeClaudeGeminiGeminiAI OverviewsAI Overviews
Rapid UI Prototyping & Development(3 queries)

“i need a cool animated landing page hero for a nextjs app, where can i find ready-to-use components better than just basic tailwind”

0/4 platforms mentioned

ChatGPTChatGPT
1.Tailwind UI
2.Flowbite
3.UI8
4.ThemeForest
5.Creative Tim

+15 more

ClaudeClaude
1.Next.js
2.Aceternity UI
3.React
4.Tailwind
5.Framer Motion

+8 more

GeminiGemini
1.Next.js
2.Tailwind CSS
3.Framer Motion
4.Three.js
5.Aceternity UI

+10 more

AI OverviewsAI Overviews
1.Next.js
2.Tailwind
3.Framer Motion
4.Three.js
5.Aceternity UI

+9 more

“help me find some community-made shadcn-like components for a dashboard, what are the best libraries right now”

1/4 platforms mentioned

ChatGPTChatGPT
1.shadcn/ui
2.Radix UI
3.Headless UI
4.Tailwind UI
5.DaisyUI

+9 more

ClaudeClaude
1.shadcn/ui
2.shadcn-dashboard
3.shadcn/ui charts
4.Recharts
5.Tailwind

+7 more

GeminiGemini
1.Next.js
2.Tailwind
3.Tremor Raw
4.Radix
5.shadcn/ui
11.21st.dev

+9 more

AI OverviewsAI Overviews
1.shadcn/ui
2.Tremor
3.Tailwind CSS
4.Vercel
5.Marmelab Shadcn Admin Kit

+7 more

“what's the best tool to generate custom react components with ai besides v0, specific recommendations please”

1/4 platforms mentioned

ChatGPTChatGPT
1.GitHub Copilot
2.Copilot Chat
3.Framer
4.Framer AI
5.Locofy.ai

+9 more

ClaudeClaude
1.Cursor
2.Claude 3.5 Sonnet
3.Vercel AI SDK
4.Custom GPT
5.GitHub Copilot

+5 more

GeminiGemini
1.Next.js
2.shadcn/ui
3.v0
4.React
5.Cursor
15.21Buttons

+10 more

AI OverviewsAI Overviews
1.v0
2.React
3.Supafine
4.Next.js
5.Tailwind CSS

+18 more

AI Driven Development & Agentic Workflows(1 query)

“how do i give my ai agent or claude code access to a ui component library to build my frontend faster”

0/4 platforms mentioned

ChatGPTChatGPT
1.Storybook
2.TypeScript
3.LangChain
4.npm
5.GitHub Packages

+21 more

ClaudeClaude
1.shadcn/ui
2.Material-UI (MUI)
3.Tailwind UI
4.Chakra UI
5.Ant Design
GeminiGemini
1.Claude Code
2.Cursor
3.Windsurf
4.Shadcn/UI
5.Mantine

+16 more

AI OverviewsAI Overviews
1.Untitled UI
2.Tailwind
3.Context7
4.Ref
5.Shadcn UI

+4 more

UI Library Trust & Category Evaluation(1 query)

“most trusted ui component marketplaces for modern react apps right now, what should i use”

0/4 platforms mentioned

ChatGPTChatGPT
1.Bit.dev
2.ThemeForest
3.Envato Market
4.UI8
5.Creative Tim

+19 more

ClaudeClaude
1.Material-UI (MUI)
2.Shadcn/ui
3.Radix UI
4.Tailwind
5.Chakra UI

+3 more

GeminiGemini
1.Tailwind UI
2.Tailwind CSS
3.MUI Store
4.Material UI
5.Chakra UI Pro

+14 more

AI OverviewsAI Overviews
1.Tailwind UI
2.Tailwind CSS
3.shadcn/ui
4.MUI (Material UI) Store
5.Untitled UI

+8 more

Analysis

Key Insights

What AI visibility analysis reveals about this brand

Strength

Gemini recognizes the brand in 42% of relevant queries, specifically identifying it as a source for shadcn-like and custom React components.

Strength

Perfect 'Brand Vibe Check' scores across all tested platforms indicate that LLMs have successfully indexed the core identity and purpose of 21st.dev.

Strength

Stronger relative resonance with High-Velocity Digital Agency Owners and Enterprise Design System Architects (17% visibility) compared to junior developers.

Gap

Zero visibility in AI-driven development and agentic workflow queries, failing to capture the 'AI agent code access' conversation.

Gap

Complete absence from ChatGPT and Claude in functional searches, meaning the two most popular coding assistants are not recommending the platform to developers.

Gap

Underperforming in high-impact visual queries, such as 'animated landing page hero,' where competitors like Aceternity UI currently dominate the narrative.

Opportunity

Own the 'UI for AI Agents' niche by creating documentation and content that explicitly links 21st.dev components to agentic tool-calling and Claude Code workflows.

Opportunity

Bridge the gap from Gemini visibility to ChatGPT/Claude by increasing presence on high-authority developer forums and documentation hubs these models prioritize.

Opportunity

Capitalize on the 'shadcn alternative' trend, as Gemini is already beginning to associate 21st.dev with this high-growth search intent.

Technical Health

Site Health for AI Visibility

How well 21st.dev's website is optimized for AI agent discovery and comprehension.

88/100
18 passed 2 warnings 2 issues
Audited 2/27/2026
Crawlability96

Can AI bots find your pages?

Technical90

SSL, mobile, doctype basics

On-Page SEO87

Titles, descriptions, headings

Content Quality60

Word count, depth, freshness

Schema Markup85

Structured data for AI comprehension

Social & OG100

Open Graph, Twitter cards

AI Readability60

How well AI can parse your content

Critical Issues

!

Page has no H1 heading

Add a single H1 tag as the main page heading.

!

Content is too thin

Expand your content to at least 300-500 words with valuable information.

Warnings

!

4 render-blocking resources are slowing initial render

Defer non-critical JS with async/defer. Inline critical CSS. Move stylesheets to load asynchronously.

Want a full technical audit with AI-specific recommendations?

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Brand Identity

Brand Voice & Style

How AI perceives 21st.dev's communication style and personality

21st.dev communicates with a modern, developer-centric voice that balances technical credibility with approachable enthusiasm. The tone is clean and efficient like their UI components—no fluff, just value. They speak to developers as peers, using industry terminology naturally while maintaining excitement about the possibilities of AI-assisted development. There's an underlying sense of community and collaboration, celebrating contributor work prominently.

Core Tone Traits

Developer-Native

Speaks the language of modern frontend developers naturally, using technical terms without over-explaining

Clean & Efficient

Communication mirrors their product—minimal, purposeful, and well-organized

Community-Driven

Celebrates contributors and fosters a collaborative, open-source spirit

Innovation-Forward

Enthusiastic about AI tools and cutting-edge development practices

Competitive Landscape

Related Ecosystem

Related products and services that AI mentions in conversations alongside or instead of 21st.dev

1Shadcn/ui37 mentions
2Next.js22 mentions
3Framer Motion21 mentions
4Tailwind21 mentions
5Aceternity UI20 mentions
6Magic UI20 mentions
7Radix UI19 mentions
8Tailwind UI15 mentions
9Tailwind CSS14 mentions
10Headless UI12 mentions
1121st.dev5 mentions
Source Intelligence

Citations

Sources that AI assistants cite. Getting featured here improves visibility.

7 Hottest Animated UI Component Libraries of 2025

https://designerup.co/blog/copy-and-paste-ui-component-libraries/

Referenced in 1 query

Review
Best fancy UI library for bad designing developer - Reddit

https://www.reddit.com/r/nextjs/comments/1e6sth9/best_fancy_ui_library_for_bad_designing_developer/

Referenced in 1 query

Join Discussion
Just launched Astrae, animated next.js landing page ... - Reddit

https://www.reddit.com/r/reactjs/comments/1nsm6ey/just_launched_astrae_animated_nextjs_landing_page/

Referenced in 1 query

Join Discussion
HeroUI (Previously NextUI) - Beautiful, fast and modern React ...

https://www.heroui.com/

Referenced in 1 query

Review
ScrollX UI: Animated UI Components for Modern Next.js Apps

https://dev.to/jqueryscript/scrollx-ui-animated-ui-components-for-modern-nextjs-apps-lim

Referenced in 1 query

Review
12 Best Nextjs Landing Page Templates For Design Inspiration

https://magicui.design/blog/nextjs-landing-page

Referenced in 1 query

Review
The Best UI Components Library For NextJS - ThemeSelection

https://themeselection.com/ui-components-library-nextjs/

Referenced in 1 query

Review
Files API

https://claude.ai/docs/files

Referenced in 1 query

Review
code.claude.com

https://code.claude.com/

Referenced in 1 query

Review
What is the best UI component library for building AI agent?

https://www.reddit.com/r/nextjs/comments/1j8khc1/what_is_the_best_ui_component_library_for/

Referenced in 1 query

Join Discussion
Any tips for creating high quality UI using Claude Code? - Reddit

https://www.reddit.com/r/ClaudeAI/comments/1lq6aal/any_tips_for_creating_high_quality_ui_using/

Referenced in 1 query

Join Discussion
Connect Claude Code to tools via MCP

https://code.claude.com/docs/en/mcp

Referenced in 1 query

Review
Content Engineering

Recommended Actions

!

Optimize technical documentation for 'AI Agent UI' and 'Claude Code' compatibility keywords.

21st.dev is currently missing from the agentic workflow category, which is the most significant growth area for modern developer tools.

Impact: High
!

Deploy a content campaign targeting 'Next.js animated landing page' and 'shadcn community components' to improve Gemini rankings.

Gemini is already surfacing the brand at positions 10-15; targeted optimization can push these into top-tier recommendations where competitors currently sit.

Impact: High
~

Build out 'Enterprise Design System' whitepapers and integration guides.

The data shows 17% visibility with enterprise architects, suggesting this persona is most receptive to 21st.dev's current value proposition.

Impact: Medium

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Backing

Investors

Y
Y Combinator
Data generated by Pendium.ai AI visibility scanning. Last scanned February 27, 2026.

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