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Average Ratings 0 Ratings
Description
LangFast is a streamlined prompt testing platform aimed at product teams, prompt engineers, and developers working with large language models. It offers immediate access to a customizable prompt playground without requiring signup, making prompt experimentation quick and hassle-free. Users can create, test, and share prompt templates using Jinja2 syntax, while receiving real-time raw outputs directly from the LLM, avoiding complicated API layers. This reduces the friction typically associated with manual prompt testing, allowing teams to validate and iterate faster. Developed by a team experienced in scaling AI SaaS products to millions of users, LangFast provides full control over the prompt development lifecycle. The platform also fosters improved team collaboration by enabling easy sharing and iteration. Its pay-as-you-go pricing ensures users only pay for what they use, keeping budgets under control. LangFast is ideal for teams seeking a flexible, cost-effective solution for prompt engineering.
Description
OpenUI is a generative UI framework for AI agents that is open-source and licensed under MIT. Rather than relying on simple text, your agent utilizes OpenUI Lang, a streamlined language designed for progressive streaming, which OpenUI seamlessly transforms into dynamic user interfaces such as charts, tables, forms, cards, and layouts. The rendering process is inherently secure, ensuring that the model is restricted to only the components you have registered, preventing any execution of generated code and maintaining control over your design system. Its core architecture is framework-agnostic, supporting first-party runtimes for popular libraries like React, Vue, Svelte, and Angular, and comes equipped with pre-built chat interfaces and integrations for various tools including LangChain/LangGraph, the Vercel AI SDK, Mastra, Google ADK, assistant-ui, CopilotKit, AG-UI, and A2UI. According to its published benchmarks, OpenUI Lang is efficient, utilizing approximately half the tokens when compared to standard JSON UI formats, thereby enabling interfaces to stream with greater speed and reduced costs. Additionally, this efficiency not only enhances performance but also makes it a cost-effective solution for developers looking to create sophisticated user interfaces quickly.
API Access
Has API
No
API Access
Has API
No
Screenshots View All
No images available
Screenshots View All
No images available
Integrations
A2UI
No
AG-UI
No
Agent Development Kit (ADK)
No
CopilotKit
No
LangChain
No
LangGraph
No
Mastra AI
No
Vercel AI SDK
No
Integrations
A2UI
Yes
AG-UI
Yes
Agent Development Kit (ADK)
Yes
CopilotKit
Yes
LangChain
Yes
LangGraph
Yes
Mastra AI
Yes
Vercel AI SDK
Yes
Pricing Details
$60 one time
Free Trial
Yes
Free Version
No
Pricing Details
Free
Free Trial
No
Free Version
Yes
Deployment
Web-Based
Yes
On-Premises
No
iPhone App
No
iPad App
No
Android App
No
Windows
No
Mac
No
Linux
No
Chromebook
No
Deployment
Web-Based
Yes
On-Premises
Yes
iPhone App
Yes
iPad App
Yes
Android App
Yes
Windows
Yes
Mac
Yes
Linux
Yes
Chromebook
Yes
Customer Support
Business Hours
No
Live Rep (24/7)
No
Online Support
No
Customer Support
Business Hours
No
Live Rep (24/7)
No
Online Support
Yes
Types of Training
Training Docs
No
Webinars
No
Live Training (Online)
No
In Person
No
Types of Training
Training Docs
Yes
Webinars
No
Live Training (Online)
No
In Person
No
Vendor Details
Company Name
Langfa.st
Founded
2025
Country
United States
Website
langfa.st/new
Vendor Details
Company Name
Thesys
Founded
2024
Country
United States
Website
www.openui.com