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What is PromptLayer?

Introducing the first-ever platform tailored specifically for prompt engineers, where users can log their OpenAI requests, examine their usage history, track performance metrics, and efficiently manage prompt templates. This innovative tool ensures that you will never misplace that ideal prompt again, allowing GPT to function effortlessly in production environments. Over 1,000 engineers have already entrusted this platform to version their prompts and effectively manage API usage. To begin incorporating your prompts into production, simply create an account on PromptLayer by selecting “log in” to initiate the process. After logging in, you’ll need to generate an API key, making sure to keep it stored safely. Once you’ve made a few requests, they will appear conveniently on the PromptLayer dashboard! Furthermore, you can utilize PromptLayer in conjunction with LangChain, a popular Python library that supports the creation of LLM applications through a range of beneficial features, including chains, agents, and memory functions. Currently, the primary way to access PromptLayer is through our Python wrapper library, which can be easily installed via pip. This efficient method will significantly elevate your workflow, optimizing your prompt engineering tasks while enhancing productivity. Additionally, the comprehensive analytics provided by PromptLayer can help you refine your strategies and improve the overall performance of your AI models.

What is LangFast?

LangFast is a lightweight yet powerful prompt testing platform tailored for product teams, prompt engineers, and developers working extensively with large language models (LLMs). Offering instant, no-signup access to a fully customizable prompt playground, it simplifies the creation and testing of prompt templates using Jinja2 syntax. Users can see real-time raw outputs directly from the LLM without any API abstractions, enabling precise control and immediate feedback. By eliminating manual testing friction, LangFast allows teams to validate prompts, iterate rapidly, and collaborate more effectively on prompt development projects. Created by a team with a proven track record of scaling AI SaaS platforms to over 15 million users, the platform emphasizes control and scalability. LangFast supports seamless sharing of prompt templates, making teamwork intuitive and efficient. Its simple pay-as-you-go pricing model ensures cost predictability and accessibility for teams of all sizes. The platform’s clean and lightweight design means it can be integrated easily into existing workflows without overhead. LangFast empowers teams to accelerate innovation in prompt engineering while managing expenses effectively. This makes it an ideal choice for organizations looking to enhance their AI-driven product development with flexible and transparent prompt testing.

Media

Media

No images available

Integrations Supported

ChatGPT
Datamorf
Ellipsis
GPT-3
GPT-3.5
GPT-4
LiteLLM
OpenAI
Workers by Delos

Integrations Supported

API Availability

Has API

API Availability

Pricing Information

Free
Free Version

Pricing Information

$60 one time
Free Trial Offered?

Supported Platforms

SaaS

Supported Platforms

SaaS

Customer Service / Support

Web-Based Support

Customer Service / Support

Not specified

Training Options

Documentation Hub

Training Options

Not specified

Company Facts

Organization Name

PromptLayer

Company Location

United States

Company Website

promptlayer.com

Company Facts

Organization Name

Langfa.st

Date Founded

2025

Company Location

United States

Company Website

langfa.st/new

Categories and Features

Context Engineering

Not specified

LLM Evaluation

Not specified

Prompt Engineering

Not specified

Prompt Management

Not specified

Categories and Features

Prompt Engineering

Not specified

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