Frontend & UI
Libraries specialized in building Chat interfaces, handling streaming text, and rendering interactive components.
| Rank | Model | Price | Summary |
|---|---|---|---|
|
1
|
Open Source | The React Standard. Now features 'Generative UI' by default, streaming React Server Components (RSC) from the LLM to render interactive flight pickers, stock charts, and purchase buttons in real-time. | |
|
2
|
Open Source | The Data King. Remains the fastest way to turn a Python script into a shareable web app. The new 'st.audio_input' and 'Custom Components v2' finally allow for deep, bi-directional communication with the browser. | |
|
3
|
Open Source | The ML Standard. The v5 rewrite introduces 'Server-Side Rendering' (SSR) for instant load times and an 'AI Playground' that lets you build the UI by talking to it. It is the native interface for 90% of Hugging Face Spaces. | |
|
4
|
Open Source | The Agent Interface. Built specifically for 'Human-in-the-Loop' workflows. It natively handles 'Step' visualization, allowing users to expand/collapse the thought process of complex agents (LangGraph/CrewAI) as they run. | |
|
5
|
Open Source | The Chat Component. A headless React library that solves the 'hard parts' of AI chat: optimistic updates, tool call visualizations, and markdown rendering. It is the engine behind many enterprise 'Copilot' sidebars. | |
|
6
|
Open Source | The Context Bridge. It doesn't just build the UI; it provides the 'read/write' link between the LLM and your app's state. Its 'CoAgents' feature allows the AI to see your screen and take actions on your behalf. | |
|
7
|
Open Source | The Self-Hosted Standard. The ultimate 'ChatGPT clone' for your local models. It supports multi-model chat, document parsing (RAG), and user management out of the box. It is the default frontend for Ollama users. | |
|
8
|
Open Source | The Python Purist. A new framework that compiles 100% Python code into modern web apps without a single line of HTML, CSS, or JavaScript. It automates the WebSocket state sync that Streamlit struggles with. | |
|
9
|
Open Source | The Internal Tool. Google's own internal UI framework, now open source. It is designed for 'Rapid Prototyping' of AI demos, offering a component model that feels like a simplified Flutter for Python. | |
|
10
|
Open Source | The Universal Embed. A framework-agnostic web component that can be dropped into any site (WordPress, Wix, React). It handles microphone input, file uploads, and camera capture directly in the browser. |
Just the Highlights
Vercel AI SDK 5.0
The React Standard. Now features 'Generative UI' by default, streaming React Server Components (RSC) from the LLM to render interactive flight pickers, stock charts, and purchase buttons in real-time.
Streamlit 1.5
The Data King. Remains the fastest way to turn a Python script into a shareable web app. The new 'st.audio_input' and 'Custom Components v2' finally allow for deep, bi-directional communication with the browser.
Gradio 5.0
The ML Standard. The v5 rewrite introduces 'Server-Side Rendering' (SSR) for instant load times and an 'AI Playground' that lets you build the UI by talking to it. It is the native interface for 90% of Hugging Face Spaces.
Chainlit v2
The Agent Interface. Built specifically for 'Human-in-the-Loop' workflows. It natively handles 'Step' visualization, allowing users to expand/collapse the thought process of complex agents (LangGraph/CrewAI) as they run.
Assistant UI
The Chat Component. A headless React library that solves the 'hard parts' of AI chat: optimistic updates, tool call visualizations, and markdown rendering. It is the engine behind many enterprise 'Copilot' sidebars.
CopilotKit
The Context Bridge. It doesn't just build the UI; it provides the 'read/write' link between the LLM and your app's state. Its 'CoAgents' feature allows the AI to see your screen and take actions on your behalf.
Open WebUI
The Self-Hosted Standard. The ultimate 'ChatGPT clone' for your local models. It supports multi-model chat, document parsing (RAG), and user management out of the box. It is the default frontend for Ollama users.
Rio
The Python Purist. A new framework that compiles 100% Python code into modern web apps without a single line of HTML, CSS, or JavaScript. It automates the WebSocket state sync that Streamlit struggles with.
Mesop (Google)
The Internal Tool. Google's own internal UI framework, now open source. It is designed for 'Rapid Prototyping' of AI demos, offering a component model that feels like a simplified Flutter for Python.
DeepChat
The Universal Embed. A framework-agnostic web component that can be dropped into any site (WordPress, Wix, React). It handles microphone input, file uploads, and camera capture directly in the browser.