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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.

What is Basalt?

Basalt is a comprehensive platform tailored for the development of artificial intelligence, allowing teams to efficiently design, evaluate, and deploy advanced AI features. With its no-code playground, Basalt enables users to rapidly prototype concepts, supported by a co-pilot that organizes prompts into coherent sections and provides helpful suggestions. The platform enhances the iteration process by allowing users to save and toggle between various models and versions, leveraging its multi-model compatibility and version control tools. Users can fine-tune their prompts with the co-pilot's insights and test their outputs through realistic scenarios, with the flexibility to either upload their own datasets or let Basalt generate them automatically. Additionally, the platform supports large-scale execution of prompts across multiple test cases, promoting confidence through feedback from evaluators and expert-led review sessions. The integration of prompts into existing codebases is streamlined by the Basalt SDK, facilitating a smooth deployment process. Users also have the ability to track performance metrics by gathering logs and monitoring usage in production, while optimizing their experience by staying informed about new issues and anomalies that could emerge. This all-encompassing approach not only empowers teams to innovate but also significantly enhances their AI capabilities, ultimately leading to more effective solutions in the rapidly evolving tech landscape.

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Integrations Supported

ChatGPT
Claude
GPT-4o
Gemini
Gemini Enterprise
Llama
Mistral AI
OpenAI

Integrations Supported

ChatGPT
Claude
GPT-4o
Gemini
Gemini Enterprise
Llama
Mistral AI
OpenAI

API Availability

Has API

API Availability

Has API

Pricing Information

$60 one time
Free Trial Offered?
Free Version

Pricing Information

Free
Free Trial Offered?
Free Version

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Company Facts

Organization Name

Langfa.st

Date Founded

2025

Company Location

United States

Company Website

langfa.st/new

Company Facts

Organization Name

Basalt

Company Location

United States

Company Website

www.getbasalt.ai/

Categories and Features

Categories and Features

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