Welcome to Prompt Forge
A local-first prompt engineering tool to create, test, and optimize your LLM prompts
Get Started in 3 Steps
1
Set up API Key
Click [🔑 API Key Settings] in the sidebar to configure your OpenRouter API key and start using AI models
2
Create a Project
Create your first project to start writing and testing prompt templates
3
Create Test Sets
Build test sets to batch test your prompts and validate performance across different scenarios
Why Prompt Forge?
Local-first
All data is stored locally in your browser, protecting your privacy and security
Simulation
Powerful simulation testing features to quickly validate prompt effectiveness
Prompt Review
AI-powered prompt review to help you optimize prompt quality
Test Sets
Batch testing capabilities to systematically evaluate prompt performance across different scenarios