PromptMage
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Introduction
PromptMage is a Python framework for building and managing complex multi-step LLM applications with version control and testing.
Listed on
July 23, 2026
What is PromptMage?
PromptMage is a Python framework designed to simplify the development of complex, multi-step applications based on large language models (LLMs). It provides an intuitive interface for creating and managing LLM workflows as a self-hosted solution, with features like prompt testing, comparison, and version control. Suitable for both small teams and large enterprises, PromptMage aims to improve productivity and foster practical use of LLM technology.
How to use PromptMage?
- Install PromptMage with pip install promptmage. Create a Python file (e.g., flow.py) and define a PromptMage instance, then add steps using the @mage.step() decorator. Run the flow with the command promptmage run flow.py, which starts the server and provides a GUI at http://localhost:8000/gui/. For production, you can run a remote backend with promptmage serve and connect your script to it.
Core features of PromptMage
- Built-in version control for prompts
- Prompt playground for testing and comparing prompts
- Auto-generated API powered by FastAPI
- Evaluation mode for manual and automatic testing
- Type-hinting for automatic inference and validation
- Self-hosted deployment (local or server)
- Collaboration features for teams
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