Langtail 1.0 is a low-code platform designed for testing AI applications. This platform simplifies the process of testing large language models (LLMs) by offering a user-friendly, spreadsheet-like interface. Users can evaluate their AI models by creating tests using natural language, pattern matching, or code. Langtail 1.0 also allows users to experiment with different models, parameters, and prompts to optimize their LLM applications. By analyzing the results of their tests, users gain valuable insights to improve their AI models.