Langtail

Langtail: The Low-Code Platform for Testing AI Apps

Langtail is a low-code platform designed to help teams test and debug AI applications with confidence. It focuses on making LLM (Large Language Model) testing easier and more comprehensive. With Langtail, you can catch bugs before your users encounter them, ensuring a smoother and more reliable AI-powered application.

What is Langtail?

Langtail is a platform that provides a spreadsheet-like interface for testing LLM-powered applications. It is designed to be accessible to everyone, regardless of their technical background. If you can use spreadsheets, you can use Langtail to test your LLM apps effectively.

How does Langtail work?

Langtail allows you to test every change to your LLM prompts with real-world data. This helps you ensure that your AI model behaves as expected under various conditions. The platform offers features like natural language scoring, pattern matching, and custom code integration to provide comprehensive testing.

Key Features:

• Easy to Use: The spreadsheet-like interface makes it accessible for both developers and non-developers.
• Comprehensive Testing: Score tests using natural language, pattern matching, or custom code.
• Optimization: Experiment with different models, parameters, and prompts to find the best combination for your use case.
• Data-Driven Insights: Gain valuable insights from test results and analytics.

Why is Langtail important?

LLM outputs can be unpredictable. Langtail puts you back in control by allowing you to test and validate your AI models rigorously. This is crucial for preventing unexpected behavior and ensuring a consistent user experience.

Here are some examples of what can happen without proper testing:

• An AI meal planner suggesting dangerous chlorine gas as an ingredient.
• An AI chatbot offering absurd deals or engaging in off-topic conversations.
• An AI chatbot providing incorrect advice, leading to customer compensation claims.

How to use Langtail

1. Integrate AI Firewall: Effortlessly integrate AI Firewall into your app with minimal configuration.
2. Customize Security: Fine-tune content filtering for your specific needs.
3. Receive AI Alerts: Get instant notifications for potential threats and unusual activities.

Langtail is not just for developers; it is designed for product, engineering, and business teams to collaborate on prompt management and testing.

Langtail and AI Security

Langtail provides features to block AI attacks and unsafe outputs instantly. These include:

• One-click Setup: Effortlessly integrate AI Firewall into your app with minimal configuration.
• Comprehensive Security: Prevent prompt injections, DoS attacks, and information leaks.
• Advanced Safety Checks: Customize and fine-tune content filtering for your specific needs.
• AI Alerts: Receive instant notifications for potential threats and unusual activities.

Langtail's Technology

Langtail offers a TypeScript SDK & OpenAPI for developers. This includes:

• Fully typed SDK with built-in code completion.

Here’s an example:

import { Langtail } from 'langtail'

const lt = new Langtail()

const result = await lt.prompts.invoke({
    prompt: 'email-classification',
    variables: {
        email: 'This is a test email',
    },
})

const value = result.choices[0].message.content

Who is Langtail for?

Langtail is suitable for engineering and AI teams. It simplifies the development and testing of AI features, enabling teams to focus on integrating AI features into their products more efficiently.

User Testimonials

Here are some testimonials from Langtail users:

• Ondřej Romancov (Software Engineer at Deepnote): “Before discovering Langtail, developers would hit dead ends for hours — sometimes days. We simply didn't know how to tame the LLM to make it consistent. Using Langtail, we've saved our team hundreds of hours and plenty of headaches.”
• Jakub Žitný: “This is already a killer tool for many use-cases we are already using it for. Super excited for the upcoming features and good luck with the launch and further development! 💜”
• Sudhanshu Gautam: “Been using LangTail for a few months now, highly recommend. It has kept me sane. If you want your LLM apps to behave uncontrollably all the time, don't use LangTail. On the other hand, if you are serious about the product you are building, you know what to do 😛 Love the product and the team's hard work. Keep up the great work!”
• Martin Staněk: “I have used Langtail for prompt refinement, and it was a real timesaver for me. Debugging and refining prompts is sometimes a tedious task, and Langtail makes it so much easier. Good work!”

Conclusion

Langtail provides a robust, low-code solution for testing and debugging AI applications. By offering an easy-to-use interface and comprehensive testing tools, Langtail helps teams build more predictable and reliable AI-powered applications, ensuring a better user experience and preventing potential issues. Whether you are an engineer, a product manager, or a business team member, Langtail can help you build faster and more predictable AI apps.