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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
The xAI PromptIDE serves as a comprehensive environment for both prompt engineering and research into interpretability. This tool enhances the process of prompt creation by providing a software development kit (SDK) that supports the implementation of intricate prompting strategies along with detailed analytics that illustrate the outputs generated by the network. We utilize this tool extensively in our ongoing enhancement of Grok.
PromptIDE was created to ensure that engineers and researchers in the community have transparent access to Grok-1, the foundational model behind Grok. The IDE is specifically designed to empower users, enabling them to thoroughly investigate the functionalities of our large language models (LLMs) efficiently. Central to the IDE is a Python code editor that, when paired with the innovative SDK, facilitates the use of advanced prompting techniques. While users execute prompts within the IDE, they are presented with valuable analytics, including accurate tokenization, sampling probabilities, alternative tokens, and consolidated attention masks.
In addition to its core functionalities, the IDE incorporates several user-friendly features, including an automatic prompt-saving capability that ensures that all work is preserved without manual input. This streamlining of the user experience further enhances productivity and encourages experimentation.
API Access
Has API
API Access
Has API
Screenshots View All
No images available
Integrations
Grok
Python
Pricing Details
$60 one time
Free Trial
Free Version
Pricing Details
Free
Free Trial
Free Version
Deployment
Web-Based
On-Premises
iPhone App
iPad App
Android App
Windows
Mac
Linux
Chromebook
Deployment
Web-Based
On-Premises
iPhone App
iPad App
Android App
Windows
Mac
Linux
Chromebook
Customer Support
Business Hours
Live Rep (24/7)
Online Support
Customer Support
Business Hours
Live Rep (24/7)
Online Support
Types of Training
Training Docs
Webinars
Live Training (Online)
In Person
Types of Training
Training Docs
Webinars
Live Training (Online)
In Person
Vendor Details
Company Name
Langfa.st
Founded
2025
Country
United States
Website
langfa.st/new
Vendor Details
Company Name
xAI
Founded
2023
Country
United States
Website
x.ai/prompt-ide/
Product Features
Product Features
Code Editors
API
Auto-Complete
Code Folding
Column Editing
Customizable Themes
Debugging
Formatting / Table Editing
Keyboard Shortcuts
Multi-Monitor Editing
Syntax Highlighting
WYSIWYG
IDE
Code Completion
Compiler
Cross Platform Support
Debugger
Drag and Drop UI
Integrations and Plugins
Multi Language Support
Project Management
Text Editor / Code Editor