Langtail 1.0

The low-code platform for testing AI apps

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LLM testing made easy with a spreadsheet-like interface. Score tests with natural language, pattern matching, or code. Optimize LLM apps by experimenting with models, parameters, and prompts. Gain insights from test results and analytics.
We launched Langtail into public beta six months ago, and today we're excited to introduce Langtail 1.0 — a major step forward for building and testing AI apps.

Taking an LLM app from an exciting demo to a dependable product is hard work. Over the past year, we’ve heard a lot about the challenges: LLMs are unpredictable, prompt iteration is a mess, and traditional testing tools fall short.

Langtail 1.0 is our answer to these problems. It’s all about control, consistency, and confidence.

Here’s what’s new:

🧪 Spreadsheet-Like Testing Interface: Drop your test cases in with ease, get instant feedback, and iterate quickly—like using Google Sheets, but for LLMs.

🔧 Hosted Tools: Langtail now handles function execution directly within the app, making