LangFastLangfa.st
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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
PromptCompose is a prompt infrastructure platform designed to bring software engineering rigor to prompt workflows. It offers version control for prompts, automatically tracking every change with deployment logs, side-by-side comparisons, and rollback capability, and integrates AB testing so multiple prompt variants can run concurrently, traffic can be split, performance tracked, and winners deployed confidently. Developers can integrate seamlessly via SDKs (JavaScript/TypeScript) or REST APIs so prompts and experiments can be part of production systems. Projects are organized in a hub structure so teams can manage resources (prompts, templates, variable groups, tests) per project, with proper isolation and collaboration. PromptCompose supports prompt blueprints (templates) and variable groups so prompts can be parameterized with dynamic inputs in a consistent, reusable way. The editor includes features like syntax highlighting, autocomplete for variables, and error detection.
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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
AI engineering teams and product builders requiring a solution to manage, test, and deploy prompts reliably
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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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Pricing
$60 one time
Free Version
Free Trial
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Pricing
No information available.
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 InformationPromptCompose
Founded: 2025
Jordan
promptcompose.ai/
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Integrations
JavaScript
Python
TypeScript
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