Langtail

Langtail is intended to make it easier to build AI-powered apps by offering a suite of tools for debugging, testing and deploying LLM prompts. The idea is to let engineering and AI teams iterate faster and ship apps that are more predictable, with fewer surprises.

To achieve that goal, Langtail has a number of features:

• Debug Prompts: Quickly experiment with different prompts and settings to get the best out of LLM. More advanced features include variables, tools, vision, and more. You can see the results of changes immediately and keep a version history.
• Run Tests: Avoid unexpected app behavior by testing your prompts. This means you can avoid breaking your app when you make changes. You can also benchmark different prompt variations to see which ones perform best.
• Deploy Prompts: Publish prompts as API endpoints so you can change them without having to redeploy your entire app. This also lets you have separate preview, staging and production environments.
• Monitor Production: See detailed performance data, including token count, LLM costs and latency for every API call. A metrics dashboard gives you a view into prompt performance metrics, and problem detection lets you identify issues based on how users interact with your app.

Langtail also has a no-code playground where you can write and run prompts without having to write code. Adjustable parameters, test suites and detailed logging let you customize and control your prompts further.

Langtail pricing includes a free tier good for small businesses and solopreneurs, with unlimited users, 5 prompts and 1000 logs per month. The Pro tier, at $99 per month, has unlimited prompts, test results and prompt versions, 10,000 logs per month and email support. An Enterprise tier, with custom pricing, adds features like SAML single sign-on, custom security questionnaires and unlimited logs per month.

Langtail is geared for teams that want to improve the development and testing of AI applications, providing a powerful foundation to experiment and deploy LLM prompts. By addressing common pain points like unpredictable behavior, team collaboration on prompts and robust evaluation, Langtail hopes to help teams build more reliable and effective AI products.

Published on June 9, 2024