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

Supernova is the agentic design system platform for AI-first product teams. We centralize the design and engineering knowledge behind a product — tokens, components, rules, code patterns, files, and skills — and turn it into connected intelligence that any AI agent can use to build correctly and consistently. Supernova agents also handle the ongoing maintenance: when design data changes, when a pull request lands, or when feedback comes in, our agents pick up the task and finish it automatically. Through an MCP server, that knowledge becomes something AI coding & design tools and agents can query directly — so instead of guessing at styles from scratch, they generate UI that's on-brand, accessible, and consistent with production code from the first prompt.

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Audience

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

Audience

Design system teams, product designers, and frontend engineers managing multi-brand or multi-platform design systems — especially at AI-first product companies.

Support

Phone Support
24/7 Live Support
Online

Support

Phone Support
24/7 Live Support
Online

API

Offers API

API

Offers API

Screenshots and Videos

Screenshots and Videos

Pricing

Free
Free Version
Free Trial

Pricing

0
Free
Pro, starting at $35
Enterprise - custom

Pricing scales with team size, number of design systems managed, and integrations (including MCP/Relay access). Enterprise includes dedicated support and onboarding — contact us for a quote. Free trial available.
Free Version
Free Trial

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
Webinars
Live Online
In Person

Training

Documentation
Webinars
Live Online
In Person

Company Information

21st.dev
21st.dev/

Company Information

Supernova
Founded: 2018
United States
www.supernova.io

Alternatives

Alternatives

Zeroheight

Zeroheight

zeroheight
21st

21st

21st.dev

Categories

Categories

Integrations

Azure Repos
Bitbucket
CSS
Cursor
Figma
GitHub
GitLab
HTML
JavaScript
LottieFiles
Raycast
React
Slack
Storybook
Tailwind CSS
shadcn/ui

Integrations

Azure Repos
Bitbucket
CSS
Cursor
Figma
GitHub
GitLab
HTML
JavaScript
LottieFiles
Raycast
React
Slack
Storybook
Tailwind CSS
shadcn/ui
Claim 21st and update features and information
Claim 21st and update features and information
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