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
Model Playground AI is a web‑based platform that lets you explore, compare, and prototype with over 150 (100+) leading AI models side by side in a single, unified interface. It provides two main modes, Explore for free‑form prompt testing and Workflows for guided, repeatable tasks, where you can adjust parameters (temperature, max tokens, etc.), submit prompts across multiple models simultaneously, and instantly see comparative outputs. Presets and saving options enable you to store your configurations and chat histories for easy reproducibility, while API endpoints and credit‑based subscriptions ensure seamless integration into your own applications without hidden markup fees. Its lightweight, no‑code design supports text, image, video, and code generation tasks in one dashboard, making it easy to benchmark model quality, optimize prompts, and accelerate AI‑driven projects.
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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
Developers, data scientists and AI enthusiasts seeking a tool to compare, test and deploy multiple AI models
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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
Supported
Online
Supported
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API
Offers API
Not Supported
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API
Offers API
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
Free
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 InformationModel Playground
United States
modelplayground.ai/
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Alternatives |
Alternatives |
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Categories |
Categories |
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Integrations
Bria.ai
Not Supported
FLUX.1
Not Supported
FLUX.2
Not Supported
GPT-Image-1
Not Supported
Gen-4
Not Supported
Grok
Not Supported
HiDream.ai
Not Supported
Ideogram AI
Not Supported
Imagen 4
Not Supported
Stable Diffusion
Not Supported
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Integrations
Bria.ai
Supported
FLUX.1
Supported
FLUX.2
Supported
GPT-Image-1
Supported
Gen-4
Supported
Grok
Supported
HiDream.ai
Supported
Ideogram AI
Supported
Imagen 4
Supported
Stable Diffusion
Supported
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