Pendium
21st.dev
21st.dev
Visibility9
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
9/100

Invisible

Sentiment Score
94/100
Score by Reach

How often this business is recommended to users across different types of conversations — from direct product queries to broader open-ended conversations where AI could recommend this company's products and services

core
9
adjacent
0
AI Perception

Key Takeaways

How AI platforms collectively perceive and describe 21st.dev today.

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
Current State

Visibility Landscape

A high-level view of how 21st.dev performs across AI platforms, broken down by strategic reach level — from core brand queries to growth opportunities.

ChatGPTChatGPT
ClaudeClaude
GeminiGemini
AI OverviewsAI Overviews

Reputation

Brand recognition & direct queries

0
0
35
0

Core Topics

Product/service category queries

0
0
0
0

Growth Areas

Adjacent, aspirational & visionary

—
—
—
—
Competitive Landscape
Shadcn/ui
37 mentions
Next.js
22 mentions
Framer Motion
21 mentions
Tailwind
21 mentions
Aceternity UI
20 mentions
Magic UI
20 mentions
Loading visibility matrix...
Analysis

Insights & Recommended Actions

What's working, what's not, and specific steps to improve 21st.dev's AI visibility.

Key Findings

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.

Recommended Actions

1

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.

2

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.

3

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.

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

Core
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

Core
The High-Velocity Digital Agency Owner · Founder & Technical Lead
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

Core
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

Source Intelligence

Citations

The sources AI platforms cite when recommending this brand. Pendium reverse-engineers what's already proven to be catnip to AI agents, then engineers content that fills gaps and helps agents do their job — which means more citations for you.

7 Hottest Animated UI Component Libraries of 2025

designerup.co

Web1 ref

Best fancy UI library for bad designing developer - Reddit

reddit.com

Forum1 ref

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

reddit.com

Forum1 ref

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

heroui.com

Web1 ref

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

dev.to

Web1 ref

12 Best Nextjs Landing Page Templates For Design Inspiration

magicui.design

Web1 ref

The Best UI Components Library For NextJS - ThemeSelection

themeselection.com

Web1 ref

Files API

claude.ai

Web1 ref

code.claude.com

code.claude.com

Web1 ref

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

reddit.com

Forum1 ref

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

reddit.com

Forum1 ref

Connect Claude Code to tools via MCP

code.claude.com

Web1 ref

Claude Code integration | Untitled UI

untitledui.com

Web1 ref

Q: Web frontend dev setup for Claude Code? - Reddit

reddit.com

Forum1 ref

How do you get Claude Code to consistently nail UI ... - Reddit

reddit.com

Forum1 ref
Competitive Landscape

Competitive Landscape

Brands and products that AI platforms mention 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
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

Backing

Investors

Y
Y Combinator

Engineer content that makes AI agents recommend you

Pendium analyzes how AI platforms perceive your brand, reverse-engineers what they already cite, and continuously publishes content designed to fill gaps and earn more mentions — on autopilot, with you in the loop.

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

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