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What is Just Prompts?

Just Prompts is a tool designed to help you write better prompts for AI models like GPT and Claude. It focuses on a technique called Additive Prompting, which lets you build up your instructions gradually to refine what the AI produces. Rather than trying to get the perfect prompt on your first attempt, you can test, adjust, and improve your instructions step by step. The tool handles API connections to OpenAI and Claude models, so you can test prompts directly without switching between different platforms. It's useful if you work regularly with AI models and want more control over the outputs you get.

Key Features

Additive Prompting

Build and refine prompts incrementally to improve AI responses

API integration

Connect to OpenAI and Claude models via API key for direct testing

Prompt history

Keep track of prompts you've created and their results

Multi-model support

Work with different AI models in one place

Prompt refinement tools

Adjust context and parameters to fine-tune outputs

Pros & Cons

Advantages

  • Structured approach to prompt writing helps you understand what works and why
  • Test prompts in real-time without copying text between applications
  • Free tier available so you can try it before committing
  • Supports multiple AI models, reducing vendor lock-in

Limitations

  • Requires API keys for OpenAI or Claude, which means ongoing costs for API usage
  • Effectiveness depends on your own skill at writing and refining prompts
  • Limited information available about the free tier's specific restrictions

Use Cases

Content creators refining prompts for generating articles, social media posts, or creative writing

Data analysts testing different prompt approaches to extract insights from documents

Marketing teams developing product descriptions and campaign copy

Developers building applications that rely on AI model outputs

Researchers experimenting with prompt structures to understand model behaviour