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
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook
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Platforms Supported
Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook
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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
24/7 Live Support
Online
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Support
Phone Support
24/7 Live Support
Online
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API
Offers API
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API
Offers API
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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
Free Trial
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Pricing
Free
Free Version
Free Trial
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Reviews/
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Reviews/
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Training
Documentation
Webinars
Live Online
In Person
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Training
Documentation
Webinars
Live Online
In Person
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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
FLUX.1
FLUX.2
GPT-Image-1
Gen-4
Grok
HiDream.ai
Ideogram AI
Imagen 4
Stable Diffusion
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Integrations
Bria.ai
FLUX.1
FLUX.2
GPT-Image-1
Gen-4
Grok
HiDream.ai
Ideogram AI
Imagen 4
Stable Diffusion
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