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
Get everything you need to start customizing LLMs and prompts immediately, no PhD required. Starter Kits with model, prompt, and dataset suggestions matched to your use case allow you to begin testing, evaluating, and refining model outputs right away. Experiment with multiple models (proprietary and open source), prompts, and techniques simultaneously to speed up the iteration process. Automated testing and evaluation and AI-powered prompt and refinement suggestions enable you to run many experiments at once to quickly achieve high-quality results. Verta’s easy-to-use platform empowers builders of all tech levels to achieve high-quality model outputs quickly. Using a human-in-the-loop approach to evaluation, Verta prioritizes human feedback at key points in the iteration cycle to capture expertise and develop IP to differentiate your GenAI products. Easily keep track of your best-performing options from Verta’s Leaderboard.
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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
Data science teams in search of an AI solution to accelerate the development and deployment of applications and ML 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
No information available.
Free Version
Not Supported
Free Trial
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
Supported
Live Online
Not Supported
In Person
Not Supported
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Company InformationLangfa.st
Founded: 2025
United States
langfa.st/new
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Company InformationVerta
United States
www.verta.ai/
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Integrations
Codestral
Not Supported
Codestral Mamba
Not Supported
Falcon
Not Supported
Llama 2
Not Supported
Mathstral
Not Supported
Ministral 3B
Not Supported
Ministral 8B
Not Supported
Mistral 7B
Not Supported
Mistral AI
Not Supported
Mistral Large
Not Supported
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Integrations
Codestral
Supported
Codestral Mamba
Supported
Falcon
Supported
Llama 2
Supported
Mathstral
Supported
Ministral 3B
Supported
Ministral 8B
Supported
Mistral 7B
Supported
Mistral AI
Supported
Mistral Large
Supported
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