LangFast

LangFast

Langfa.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.

About

Prompeteer Contextual Intelligence Platform is a contextual AI platform for A+ agentic prompts and skills. It enables individuals and enterprises to build production-ready prompts and agent skills for ChatGPT, Claude, Gemini, Perplexity, Grok, Meta AI, Copilot, Cursor, Replit, and 140+ AI platforms. Simply type your request in plain language and Prompeteer instantly transforms it into an expert-level prompt—context-powered, quality-scored, and ready to deploy. Features include multimodal prompt creation (text, code, data, image, video, audio), Prompt Score for objective quality evaluation, PromptDrive for saving and organizing prompts, Agent Skills (production-ready SKILL.md files), seamless workflow integrations, and support for 100+ languages. Trusted by tens of thousands of professionals and enterprises in 157 countries. GDPR & CCPA compliant, 100% private, with a free version available.

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

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.

Audience

Professionals, knowledge workers, developers, enterprises, marketers, data scientists, legal teams, educators, and anyone looking to maximize their AI productivity across ChatGPT, Claude, Gemini, and other AI platforms.

Support

Phone Support
24/7 Live Support
Online

Support

Phone Support
24/7 Live Support
Online

API

Offers API

API

Offers API

Screenshots and Videos

No images available

Screenshots and Videos

No images available

Pricing

$60 one time
Free Version
Free Trial

Pricing

Free / Premium Plans
Free Version
Free Trial

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Training

Documentation
Webinars
Live Online
In Person

Training

Documentation
Webinars
Live Online
In Person

Company Information

Langfa.st
Founded: 2025
United States
langfa.st/new

Company Information

Prompeteer.ai
Founded: 2025
United States
prompeteer.ai

Alternatives

Alternatives

No Alternatives

Categories

Categories

Integrations

No info available.

Integrations

No info available.
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