LangFastLangfa.st
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Related Products
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About
LangFast is a lightweight prompt testing platform designed for product teams, prompt engineers, and developers working with LLMs. It offers instant access to a customizable prompt playground—no signup required. Users can build, test, and share prompt templates using Jinja2 syntax with real-time raw outputs directly from the LLM, without any API abstractions.
LangFast eliminates the friction of manual testing by letting teams validate prompts, iterate faster, and collaborate more effectively. Built by a team with experience scaling AI SaaS to 15M+ users, LangFast gives you full control over the prompt development process—while keeping costs predictable through a simple pay-as-you-go model.
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About
Promptimize AI is a browser extension that empowers users to enhance their AI interactions seamlessly. By simply writing a prompt and clicking "enhance," users can transform their initial inputs into more effective prompts, thereby improving AI-generated content quality. The extension offers features such as instant enhancement, dynamic variables for consistent context, a prompt library for saving favorites, and compatibility with all major AI platforms, including ChatGPT, Claude, and Gemini. This tool is ideal for anyone looking to streamline their prompt creation process, maintain brand consistency, and refine their prompt engineering skills without the need for extensive expertise. People shouldn’t have to become prompt engineers to use AI, let Promptimize do the heavy lifting. Tailored prompts generate more precise, engaging, and impactful AI outputs. Streamline your prompt creation process, saving valuable time and resources.
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Platforms Supported
Windows
Not Supported
Mac
Not Supported
Linux
Not Supported
Cloud
Supported
On-Premises
Not Supported
iPhone
Not Supported
iPad
Not Supported
Android
Not Supported
Chromebook
Not Supported
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Platforms Supported
Windows
Not Supported
Mac
Not Supported
Linux
Not Supported
Cloud
Supported
On-Premises
Not Supported
iPhone
Not Supported
iPad
Not Supported
Android
Not Supported
Chromebook
Not Supported
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Audience
Product teams, software engineers, prompt engineers, AI developers, ML researchers, startup founders, and technical writers working on AI-powered features or language model integrations.
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Audience
Marketing professionals in search of a tool to generate precise and engaging AI-driven content for campaigns and branding
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Support
Phone Support
Not Supported
24/7 Live Support
Not Supported
Online
Not Supported
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Support
Phone Support
Not Supported
24/7 Live Support
Not Supported
Online
Supported
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API
Offers API
Not Supported
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API
Offers API
Not Supported
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Screenshots and VideosNo images available
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Screenshots and Videos |
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Pricing
$60 one time
Free Version
Not Supported
Free Trial
Supported
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Pricing
$12 per month
Free Version
Supported
Free Trial
Not Supported
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Reviews/
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Reviews/
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Training
Documentation
Not Supported
Webinars
Not Supported
Live Online
Not Supported
In Person
Not Supported
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Training
Documentation
Supported
Webinars
Not Supported
Live Online
Supported
In Person
Not Supported
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Company InformationLangfa.st
Founded: 2025
United States
langfa.st/new
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Company InformationPromptimize
Founded: 2024
United States
www.promptimizeai.com
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Categories |
Categories |
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Integrations
ChatGPT
Not Supported
Claude
Not Supported
Copilot
Not Supported
DeepSeek
Not Supported
Gemini
Not Supported
Gemini Enterprise
Not Supported
Google Chrome
Not Supported
Grok
Not Supported
OpenAI
Not Supported
Perplexity
Not Supported
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Integrations
ChatGPT
Supported
Claude
Supported
Copilot
Supported
DeepSeek
Supported
Gemini
Supported
Gemini Enterprise
Supported
Google Chrome
Supported
Grok
Supported
OpenAI
Supported
Perplexity
Supported
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