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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.

What is Chainlit?

Chainlit is an adaptable open-source library in Python that expedites the development of production-ready conversational AI applications. By leveraging Chainlit, developers can quickly create chat interfaces in just a few minutes, eliminating the weeks typically required for such a task. This platform integrates smoothly with top AI tools and frameworks, including OpenAI, LangChain, and LlamaIndex, enabling a wide range of application development possibilities. A standout feature of Chainlit is its support for multimodal capabilities, which allows users to work with images, PDFs, and various media formats, thereby enhancing productivity. Furthermore, it incorporates robust authentication processes compatible with providers like Okta, Azure AD, and Google, thereby strengthening security measures. The Prompt Playground feature enables developers to adjust prompts contextually, optimizing templates, variables, and LLM settings for better results. To maintain transparency and effective oversight, Chainlit offers real-time insights into prompts, completions, and usage analytics, which promotes dependable and efficient operations in the domain of language models. Ultimately, Chainlit not only simplifies the creation of conversational AI tools but also empowers developers to innovate more freely in this fast-paced technological landscape. Its extensive features make it an indispensable asset for anyone looking to excel in AI development.

Media

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Media

Integrations Supported

Active Directory
ChatGPT
Claude
Google Cloud Platform
Hugging Face
LangChain
LlamaIndex
Okta
OpenAI

Integrations Supported

Active Directory
ChatGPT
Claude
Google Cloud Platform
Hugging Face
LangChain
LlamaIndex
Okta
OpenAI

API Availability

Has API

API Availability

Has API

Pricing Information

$60 one time
Free Trial Offered?
Free Version

Pricing Information

Pricing not provided.
Free Trial Offered?
Free Version

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

Langfa.st

Date Founded

2025

Company Location

United States

Company Website

langfa.st/new

Company Facts

Organization Name

Chainlit

Company Location

United States

Company Website

chainlit.io

Categories and Features

Categories and Features

Conversational AI

Code-free Development
Contextual Guidance
For Developers
Intent Recognition
Multi-Languages
Omni-Channel
On-Screen Chats
Pre-configured Bot
Reusable Components
Sentiment Analysis
Speech Recognition
Speech Synthesis
Virtual Assistant

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