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What is Flue?

Flue represents a cutting-edge framework aimed at building resilient AI agents within a customizable TypeScript setting. Created by the team behind Astro, it features a React-like hooks API that supports the development of various agent functionalities such as persistent state management, lifecycle events, and a variety of models and tools, all seamlessly integrated into the coding environment. These agents not only maintain their state but can also be accessed through HTTP protocols, ensuring context is preserved during interactions while they adapt their capabilities as tasks change. With Flue, every session is meticulously recorded in a dependable stream, facilitating task recovery even after unexpected crashes or restarts, which allows for a smooth continuation of interrupted sessions without requiring clients to start over. Developers have the option to run agents locally, utilize continuous integration, connect them with their own backend infrastructures, or manage them through services like Cloudflare Workflows and Inngest. The framework includes secure sandboxes where agents can carry out commands, alter files, and engage in productive tasks, while built-in tools provide connections to numerous APIs and data sources. Additionally, Flue is powered by Pi and supports various LLM providers, giving teams the flexibility to choose models that align with their specific requirements. This innovative framework ultimately equips developers with the means to create adaptable AI agents capable of responding to shifting demands and environments, enhancing their overall functionality and efficiency. By streamlining the process of agent creation, Flue not only simplifies the development journey but also opens up new possibilities for AI applications across diverse industries.

What is 21st?

21st is a developer-focused platform designed to simplify the creation and deployment of AI agents within modern software applications. The platform provides an SDK that allows developers to define agents using simple code while integrating tools, prompts, and AI models. It supports multiple development environments and frameworks including Next.js, React, TypeScript, Python, Node.js, and other common programming stacks. Developers can configure agents to run on advanced runtimes such as Claude Code or Codex, enabling tool usage, file access, and intelligent task execution. Once the agent configuration is defined, deployment can be completed using a single command that automatically sets up infrastructure. The platform manages backend systems such as sandboxed execution environments, authentication, rate limits, and streaming responses. It also includes a drop-in chat interface component that developers can embed directly into their applications to enable user interaction with agents. Real-time token streaming allows users to see responses generated progressively, creating a more interactive experience. The platform provides built-in observability tools that allow developers to monitor conversations, replay sessions, and trace agent actions. These features make debugging and optimization much easier during development and production. 21st also includes usage controls such as per-user spending limits, quotas, and metering to help manage AI costs. By combining powerful developer tools with managed infrastructure and deployment capabilities, 21st makes it easier for teams to build and scale AI-powered agents within their products.

Media

Media

Integrations Supported

Amazon Web Services (AWS)
Braintrust
Cloudflare
Daytona
Discord
Docker
GitHub
GitLab
Model Context Protocol (MCP)
MongoDB
Notion
OpenTelemetry
PostgreSQL
Render
Salesforce
Supabase
Telegram
Twilio
Vercel
shadcn/ui

Integrations Supported

Amazon Web Services (AWS)
Braintrust
Cloudflare
Daytona
Discord
Docker
GitHub
GitLab
Model Context Protocol (MCP)
MongoDB
Notion
OpenTelemetry
PostgreSQL
Render
Salesforce
Supabase
Telegram
Twilio
Vercel
shadcn/ui

API Availability

Has API

API Availability

Has API

Pricing Information

Pricing not provided
Free Version
Free Trial Offered?

Pricing Information

Free
Free Version
Free Trial Offered?

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Company Facts

Organization Name

Flue

Date Founded

2026

Company Location

United States

Company Website

flueframework.com

Company Facts

Organization Name

21st.dev

Company Website

21st.dev/

Categories and Features

Categories and Features

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