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

Unleash your creativity with PromptPal, the ultimate platform for discovering and sharing the best AI prompts. Generate new ideas, and boost productivity. Unlock the power of artificial intelligence with PromptPal's over 3,400 free AI prompts. Explore our great catalog of directions and be inspired and more productive today. Browse our large catalog of ChatGPT prompts and get inspired and more productive today. Earn revenue by posting prompts and sharing your prompt engineering skills with the PromptPal community.

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

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

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

Individuals that want a solution to discover the best AI prompts written by creators everywhere

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Not Supported

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported

API

Offers API Not Supported

API

Offers API Not Supported

Screenshots and Videos

No images available

Screenshots and Videos

Pricing

$60 one time
Free Version Not Supported
Free Trial Supported

Pricing

$3.74 per month
Free Version Supported
Free Trial Not Supported

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 Not Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Company Information

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

Company Information

PromptPal
www.promptpal.net

Alternatives

Alternatives

Categories

Prompt Engineering Supported

Categories

Integrations

ChatGPT Not Supported
DALL·E 2 Not Supported
DALL·E 3 Not Supported
Llama Not Supported
Llama 2 Not Supported
Llama 3 Not Supported
Llama 3.1 Not Supported
Llama 3.2 Not Supported
Llama 3.3 Not Supported
Mathstral Not Supported
Midjourney Not Supported
Ministral 3B Not Supported
Ministral 8B Not Supported
Mistral 7B Not Supported
Mistral AI Not Supported
Mistral NeMo Not Supported
Mistral Small Not Supported
Mixtral 8x22B Not Supported
Stable Diffusion Not Supported

Integrations

ChatGPT Supported
DALL·E 2 Supported
DALL·E 3 Supported
Llama Supported
Llama 2 Supported
Llama 3 Supported
Llama 3.1 Supported
Llama 3.2 Supported
Llama 3.3 Supported
Mathstral Supported
Midjourney Supported
Ministral 3B Supported
Ministral 8B Supported
Mistral 7B Supported
Mistral AI Supported
Mistral NeMo Supported
Mistral Small Supported
Mixtral 8x22B Supported
Stable Diffusion Supported
Claim LangFast and update features and information
Claim LangFast and update features and information
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Claim PromptPal and update features and information