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Description

21st is a development platform designed to help engineers quickly build and deploy AI agents inside their applications. The platform provides a specialized SDK that simplifies the process of defining agent behavior, integrating tools, and connecting AI models. Developers can create agents using familiar technologies such as Next.js, React, TypeScript, Python, and Node.js, making integration straightforward for modern applications. Once an agent is defined, the platform allows it to be deployed with a single command while automatically handling infrastructure requirements. 21st provides sandboxed execution environments through E2B sessions, ensuring that agent operations run securely and independently. The platform includes a ready-to-use chat interface component that can be embedded directly into an app for user interaction. Additional features include token streaming, conversation history, tool execution, and built-in observability for debugging and monitoring. Developers can replay sessions and trace tool calls to better understand how agents behave during execution. The system also supports spend limits, authentication controls, and rate limiting to manage AI usage across users. By combining development tools with managed infrastructure, 21st helps teams launch scalable AI agents without building complex backend systems.

Description

Stainless is an API developer experience platform that enables companies to automatically generate robust SDKs, synchronized API documentation, and Model Context Protocol (MCP) servers directly from OpenAPI specifications. Built for modern API-first businesses and AI-driven ecosystems, Stainless helps organizations deliver best-in-class developer tooling and agent-ready infrastructure without manually maintaining SDKs or documentation across multiple programming languages. The platform supports generation of idiomatic SDKs for TypeScript, Python, Go, Java, Ruby, C#, PHP, and other major languages, ensuring developers can integrate APIs using language-native patterns and tooling. Stainless continuously derives SDKs and documentation from a centralized OpenAPI specification, allowing documentation and client libraries to remain automatically aligned with evolving APIs and reducing maintenance complexity for engineering teams. In addition to developer tooling, the platform supports state-of-the-art MCP server generation, enabling AI agents and AI-powered systems to interact with APIs more effectively through standardized interfaces. Stainless is used by API-focused technology companies and infrastructure providers seeking to improve onboarding, reduce integration friction, accelerate adoption, and provide consistent developer experiences at scale. By automating SDK generation, documentation synchronization, and MCP infrastructure from a single API specification, Stainless helps engineering organizations deliver reliable, scalable, and agent-friendly API ecosystems more efficiently.

API Access

Has API

API Access

Has API

Screenshots View All

Screenshots View All

Integrations

GitHub
Go
Java
Kotlin
Model Context Protocol (MCP)
Node.js
Python
React
Ruby
Tailwind CSS
Terraform
TypeScript
shadcn/ui

Integrations

GitHub
Go
Java
Kotlin
Model Context Protocol (MCP)
Node.js
Python
React
Ruby
Tailwind CSS
Terraform
TypeScript
shadcn/ui

Pricing Details

Free
Free Trial
Free Version

Pricing Details

$250 per month
Free Trial
Free Version

Deployment

Web-Based
On-Premises
iPhone App
iPad App
Android App
Windows
Mac
Linux
Chromebook

Deployment

Web-Based
On-Premises
iPhone App
iPad App
Android App
Windows
Mac
Linux
Chromebook

Customer Support

Business Hours
Live Rep (24/7)
Online Support

Customer Support

Business Hours
Live Rep (24/7)
Online Support

Types of Training

Training Docs
Webinars
Live Training (Online)
In Person

Types of Training

Training Docs
Webinars
Live Training (Online)
In Person

Vendor Details

Company Name

21st.dev

Website

21st.dev/

Vendor Details

Company Name

Anthropic

Country

United States

Website

www.stainless.com

Product Features

Alternatives

Alternatives

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