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

Butterbase is a backend-as-a-service (BaaS) platform purpose-built for developers and non-developers who build apps with AI coding tools. Connect Butterbase to your AI coding tool — Claude Code, Cursor, Windsurf, Codex, Copilot, or any MCP-compatible tool — and your entire backend is provisioned automatically. Describe what you need in natural language and get a production-ready Postgres database, authentication, REST APIs, real-time subscriptions, file storage, and edge functions in seconds. No SQL, no DevOps, no backend experience required.

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

Butterbase is built for vibe coders, solo founders, indie hackers, non-technical builders, and small teams who want to ship full-stack applications without managing infrastructure. If you build frontends with AI coding assistants and need a backend that keeps up, Butterbase is the fastest path from idea to production.

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/month
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

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Reviews/Ratings

Overall 5.0 / 5
ease 5.0 / 5
features 5.0 / 5
design 5.0 / 5
support 4.0 / 5

Training

Documentation
Webinars
Live Online
In Person

Training

Documentation
Webinars
Live Online
In Person

Company Information

21st.dev
21st.dev/

Company Information

Butterbase
Founded: 2026
United States
butterbase.ai/

Alternatives

Alternatives

Categories

Categories

Integrations

Claude Code
Claude Desktop
Cline
Codex CLI
Cursor
Devin Desktop
GitHub Copilot
Kiro
Model Context Protocol (MCP)
React
Roo Code
TRAE
Tailwind CSS
shadcn/ui

Integrations

Claude Code
Claude Desktop
Cline
Codex CLI
Cursor
Devin Desktop
GitHub Copilot
Kiro
Model Context Protocol (MCP)
React
Roo Code
TRAE
Tailwind CSS
shadcn/ui
Claim 21st and update features and information
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