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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
Integrations
GitHub
Go
Java
Kotlin
Model Context Protocol (MCP)
Node.js
Python
React
Ruby
Tailwind CSS
Integrations
GitHub
Go
Java
Kotlin
Model Context Protocol (MCP)
Node.js
Python
React
Ruby
Tailwind CSS
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