16x Prompt is a desktop application that helps developers manage source code context and craft optimized prompts for AI coding tasks. It allows users to select relevant files, add custom instructions, and send prompts via API or copy them to paste into ChatGPT, Claude, or other LLMs. The app supports code editing with visual diffs, prompt management, workspace organization, and token limit tracking. It integrates with OpenAI, Anthropic, Google Gemini, DeepSeek, and other providers via API. The free version allows 10 prompts per day, with paid licenses for unlimited use.