occupiedbyhim/prompt-engineer ? reverse-engineered prompt

Build me a web app called Prompt Engineer that helps me compare different versions of the same prompt and prove which one actually works better in production.

I want to be able to create a prompt, save versions of it like drafts and commits, pin one version as the current production version, and run experiments where traffic is split between variants like 50/50 or 90/10. The app should send requests through either Anthropic or OpenAI, record the result, and show useful analytics like latency, tokens, cost, success rate, and whether the difference is statistically meaningful. I also want a simple way to mark an execution as successful later, after I know the outcome.

Make it feel polished and modern, with a dashboard for prompts, versions, experiments, and analytics. If you need to check current docs for the model APIs or anything else, go ahead and look them up online.