Promptmetheus

Promptmetheus is a web-based Prompt Engineering IDE for developers, AI engineers, and teams building LLM-powered apps, agents, and workflow automations.

Key capabilities include:

• Modular prompt composition using LEGO-like blocks such as Context, Task, Instructions, Samples (shots), and Primer, plus prompt variables for reusable details
• Model testing and comparison across 15 providers and 150+ models, with configurable parameters including token limit, temperature, top-p, frequency penalty, and presence penalty
• Reliability and performance evaluation with datasets, completion ratings, automatic evaluators, cost estimation, and stats and insights dashboards
• Prompt lifecycle management with prompt history, versioning, changelogs, cloud sync between devices, and team workspaces with real-time collaboration (paid)

Pricing: Freemium. Playground plan is Free. Paid plans include Single ($29/month, 7-day free trial) and Team ($99/month). Subscriptions exclude inference costs, users provide their own API keys.

Notable for combining a structured prompt editor with traceability, evaluation tooling, and broad multi-provider model access in one IDE, plus export to .txt, .csv, .xlsx, and .json and deployment to .