Last updated 08-12-2026
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PROMPTMETHEUS · Prompt Engineering IDE
Promptmetheus is a prompt engineering IDE for developers building LLM-powered apps, agents, and workflows. Its Archery app breaks prompts into block sections like Context, Task, Instructions, Samples, and Primer so you can vary each piece without rewriting the whole thing. You test completions against 150+ models from 15 API providers, rate outputs, and track changes across projects. A free Forge playground handles lighter local OpenAI testing.
Where provider playgrounds stop at one-off chat tests, Promptmetheus treats prompt design like structured software work. Datasets let you rerun the same prompt against different inputs, automatic evaluators flag constraint violations on each completion, and version history logs every edit in the chain. That focus on repeatability and team libraries sets it apart from general code assistants that embed prompts inside application code without a dedicated testing loop.
It fits prompt engineers, AI developers, and product teams shipping LLM features who need shared workspaces and traceable experiments. Consultants and university groups use Team accounts for real-time collaboration on prompt libraries. Anyone who already has API keys can plug them in, since subscriptions cover the IDE only, not inference spend.
Break prompts into Context, Task, Instructions, Samples, and Primer blocks for section-level edits
Test against 15 API providers and 150+ LLMs, or connect custom OpenAI-compatible endpoints
Run batch tests with Datasets and score completions with automatic evaluators and ratings
Track prompt versions, changelogs, and inference cost estimates per model and configuration
Export prompts and completions as .txt, .csv, .xlsx, or .json files
Team workspaces sync prompt libraries in real time with 3 seats included on the $99/month plan
Block-based prompt structure makes it easy to swap sections without rewriting full prompts
150+ models across 15 providers in one IDE, plus custom OpenAI API endpoints
Datasets, evaluators, and completion ratings give repeatable QA beyond casual playground tests
Team plans include shared workspaces with real-time sync for prompt libraries
Archery requires a screen 12 inches or larger, so it is not designed for phones
Subscriptions cover the IDE only; you supply and pay for your own LLM API keys
Team plan starts at $99 per month for three seats, which may be high for solo testers
Moving a prompt between projects within Archery is not supported yet per docs
How much does Promptmetheus cost?
Promptmetheus offers a free Forge playground, a Single plan at $29 per month with a 7-day free trial, and a Team plan at $99 per month with 3 users included. Additional Team seats cost $19 per month each. Subscriptions cover the IDE only, not LLM inference.
What LLM providers does Promptmetheus support?
Promptmetheus connects to 15 API providers and 150+ models, including Anthropic, OpenAI, Google DeepMind, Mistral, and Groq. You can also add custom models that follow the OpenAI API or LiteLLM SDK. Forge supports OpenAI models only.
What is the difference between Forge and Archery in Promptmetheus?
Forge is Promptmetheus's free local playground with OpenAI models and local data storage. Archery is the paid Prompt IDE with cloud sync, 150+ models, datasets, evaluators, and team workspaces. You can export Forge projects and import them into Archery.
Do Promptmetheus subscriptions include API credits?
No. Promptmetheus subscriptions pay for the IDE and collaboration features only. You bring your own API keys from providers like OpenAI or Anthropic and pay inference costs directly to those services.
Can teams collaborate on prompts in Promptmetheus?
Yes. Promptmetheus Team accounts include shared workspaces with real-time sync, user management, and a shared prompt library. The Team plan includes 3 users and costs $99 per month, with each extra seat at $19 per month.
What export formats does Promptmetheus support?
Promptmetheus lets you export prompts and completions as .txt, .csv, .xlsx, or .json files. Forge and Archery both support data import and export, though Forge prompt history cannot be migrated because it is not stored locally.