21st

21st

21st.dev
+
+

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About

21st is a developer platform that provides the fastest way to add AI agents directly into applications. The platform offers an SDK that allows developers to define, deploy, and run AI agents with minimal infrastructure setup. Developers can integrate agents using popular frameworks such as Next.js, React, TypeScript, Python, and Node.js. 21st includes built-in features like chat interfaces, session history, tool execution, memory, and real-time streaming responses. The platform also manages backend components such as sandboxed execution environments, authentication, rate limits, and observability. With support for Claude Code and Codex runtimes, developers can build agents that interact with tools, files, and APIs securely. By handling infrastructure and deployment automatically, 21st enables teams to launch production-ready AI agents quickly.

About

Gummble is a UI design reference library with more than 300,000 real app screenshots, 21,000+ user flows, and design patterns from 1,500+ shipped iOS, Android, and web products. Designers, UX researchers, developers, and product teams can search by pattern, such as onboarding, paywalls, empty states, and settings; by UI copy; or by complete flows. Each screen includes design analysis, and users can save references to collections. Its MCP server lets compatible AI assistants and coding tools, including Claude, Cursor, and Codex, search the library to ground interface design and implementation in real product examples. The free plan offers limited browsing; Browse adds unlimited screens, flows, downloads, collections, and MCP access, while Pro adds Figma export.

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Audience

Software developers, startups, and product teams that want a fast and scalable way to build and deploy AI agents inside their applications

Audience

Product designers, UX researchers, front-end developers and product teams looking for real-world UI references.

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported

API

Offers API Not Supported

API

Offers API Supported

Screenshots and Videos

Screenshots and Videos

No images available

Pricing

Free
Free Version Supported
Free Trial Not Supported

Pricing

$9.99/month
A Free plan provides limited browsing. Browse is $9.99/month and includes unlimited screens, flows, downloads, collections, and MCP access. Pro is $14.99/month and adds Figma export.
Free Version Supported
Free Trial Not Supported

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Company Information

21st.dev
21st.dev/

Company Information

Gummble
Founded: 2026
Vietnam
gummble.com

Alternatives

Alternatives

Refero

Refero

Refero Design

Categories

AI SDKs Supported
UI Design Supported

Categories

UI Design Supported

Integrations

Claude Not Supported
Codex CLI Not Supported
Cursor Not Supported
Figma Not Supported
Grok Bot Supported
Model Context Protocol (MCP) Not Supported
React Supported
Tailwind CSS Supported
shadcn/ui Supported

Integrations

Claude Supported
Codex CLI Supported
Cursor Supported
Figma Supported
Grok Bot Not Supported
Model Context Protocol (MCP) Supported
React Not Supported
Tailwind CSS Not Supported
shadcn/ui Not Supported
Claim 21st and update features and information
Claim 21st and update features and information
Claim Gummble and update features and information
Claim Gummble and update features and information