Promptmetheus is a prompt engineering IDE built for systematically composing, testing, and optimizing LLM prompts rather than iterating blindly inside a chat interface. It gives direct access to 150+ language models across 15+ providers, including Anthropic, OpenAI, Google DeepMind, and Mistral, all from one workspace.
Automatic Evaluators score prompt outputs against defined criteria, and built-in Cost Calculation tracks spend across models and providers before committing to production use – turning prompt design into a measurable, repeatable engineering process instead of guesswork.
Promptmetheus targets developers, prompt engineers, and teams building LLM-powered products who need to compare models and iterate rigorously. Playground: free, single user, OpenAI models only. Single: $29/month. Team: $99/month with 3 included users, $19/month per additional user. 7-day free trial.
