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

Literal AI is a collaborative platform designed to assist engineering and product teams in developing production-grade Large Language Model (LLM) applications. It offers a suite of tools for observability, evaluation, and analytics, enabling efficient tracking, optimization, and integration of prompt versions. Key features include multimodal logging, encompassing vision, audio, and video, prompt management with versioning and AB testing capabilities, and a prompt playground for testing multiple LLM providers and configurations. Literal AI integrates seamlessly with various LLM providers and AI frameworks, such as OpenAI, LangChain, and LlamaIndex, and provides SDKs in Python and TypeScript for easy instrumentation of code. The platform also supports the creation of experiments against datasets, facilitating continuous improvement and preventing regressions in LLM applications.

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

Engineering teams interested in a tool to build, monitor, and optimize production-grade LLM applications

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

Pricing

$60 one time
Free Version
Free Trial

Pricing

No information available.
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

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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

Literal AI
United States
www.literalai.com

Alternatives

Alternatives

DeepEval

DeepEval

Confident AI

Categories

Categories

Integrations

Amazon Web Services (AWS)
Claude
Codestral Mamba
Gemini 1.5 Flash
Gemini 1.5 Pro
Gemini Enterprise
Gemini Pro
Hugging Face
LangChain
Le Chat
Llama 2
Mathstral
Microsoft Azure
Ministral 3B
Mistral Large
Mistral NeMo
Mistral Small
Pixtral Large
Python
TypeScript

Integrations

Amazon Web Services (AWS)
Claude
Codestral Mamba
Gemini 1.5 Flash
Gemini 1.5 Pro
Gemini Enterprise
Gemini Pro
Hugging Face
LangChain
Le Chat
Llama 2
Mathstral
Microsoft Azure
Ministral 3B
Mistral Large
Mistral NeMo
Mistral Small
Pixtral Large
Python
TypeScript
Claim LangFast and update features and information
Claim LangFast and update features and information
Claim Literal AI and update features and information
Claim Literal AI and update features and information