What is it

Promptmetheus is an online tool that helps users write and test prompts (text inputs) for large language models (LLMs) like OpenAI's ChatGPT. It provides a graphical interface for composing prompts, testing them out with different models and parameters, and evaluating the results. Users can then save and organize their prompts, and export them in various formats.

Key features

• Compose prompts with blocks and fragments
• Test and compare different models and input parameters
• Rate, organize, search, and filter prompt outputs
• Estimate cost per prompt execution
• Performance visualization for prompts and fragments
• Export data as .csv, .xlsx, or .json file

Pros

• Easy to use, even for non-developers
• Supports GPT-4
• Free to use

Cons

• Not open-source
• Data is stored in the user's browser, and there is no database
• Users pay for the OpenAI API usage with their own API key

Summary

Promptmetheus is a powerful tool for developing and testing prompts for LLMs. It is easy to use, supports GPT-4, and is free to use. However, it is not open-source, data is stored in the user's browser, and users pay for the OpenAI API usage with their own API key.