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What is OpenUI?

OpenUI is an open-source generative user interface framework for AI agents, licensed under the MIT agreement. Instead of merely using basic text, this framework employs OpenUI Lang, a specialized language tailored for progressive streaming, which is then transformed into interactive components like charts, tables, forms, cards, and layouts by OpenUI. The rendering process is designed with security in mind, limiting the model to only the components you've registered, which ensures that no generated code is executed, thus preserving control over your design system. Its foundational architecture is agnostic to frameworks, accommodating first-party runtimes for popular libraries such as React, Vue, Svelte, and Angular, while also offering pre-built chat interfaces and integrations with a variety of tools like LangChain/LangGraph, the Vercel AI SDK, Mastra, Google ADK, assistant-ui, CopilotKit, AG-UI, and A2UI. OpenUI Lang is noted for its efficiency, reportedly using about half the tokens compared to traditional JSON UI formats, which facilitates faster streaming of interfaces at a lower cost. This remarkable efficiency not only improves performance but also positions OpenUI as a smart and economical choice for developers eager to build advanced user interfaces with speed and ease. Ultimately, the combination of security, flexibility, and cost-effectiveness makes OpenUI a compelling choice for modern application development.

What is LangFast?

LangFast is a lightweight yet powerful prompt testing platform tailored for product teams, prompt engineers, and developers working extensively with large language models (LLMs). Offering instant, no-signup access to a fully customizable prompt playground, it simplifies the creation and testing of prompt templates using Jinja2 syntax. Users can see real-time raw outputs directly from the LLM without any API abstractions, enabling precise control and immediate feedback. By eliminating manual testing friction, LangFast allows teams to validate prompts, iterate rapidly, and collaborate more effectively on prompt development projects. Created by a team with a proven track record of scaling AI SaaS platforms to over 15 million users, the platform emphasizes control and scalability. LangFast supports seamless sharing of prompt templates, making teamwork intuitive and efficient. Its simple pay-as-you-go pricing model ensures cost predictability and accessibility for teams of all sizes. The platform’s clean and lightweight design means it can be integrated easily into existing workflows without overhead. LangFast empowers teams to accelerate innovation in prompt engineering while managing expenses effectively. This makes it an ideal choice for organizations looking to enhance their AI-driven product development with flexible and transparent prompt testing.

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Integrations Supported

A2UI
AG-UI
Agent Development Kit (ADK)
CopilotKit
LangChain
LangGraph
Mastra AI
Vercel AI SDK

Integrations Supported

API Availability

API Availability

Pricing Information

Free
Free Version

Pricing Information

$60 one time
Free Trial Offered?

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Supported Platforms

SaaS

Customer Service / Support

Web-Based Support

Customer Service / Support

Not specified

Training Options

Documentation Hub

Training Options

Not specified

Company Facts

Organization Name

Thesys

Date Founded

2024

Company Location

United States

Company Website

www.openui.com

Company Facts

Organization Name

Langfa.st

Date Founded

2025

Company Location

United States

Company Website

langfa.st/new

Categories and Features

AI Development

Not specified

Categories and Features

Prompt Engineering

Not specified

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