vx.dev is an open-source alternative to v0.dev with the following benefits: - Cost-effective: Through prompt engineering, the cost of use can be greatly reduced - Easily customizable: Open-source prompts are provided, allowing for the customization of UI components or coding styles to meet specific needs - Seamless GitHub Integration: Generated code is stored on GitHub, featuring built-in version control and code review functionalities The working principle of vx.dev involves using the GPT-4 model to generate code based on predefined prompts. The main cost lies in the number of tokens for input and completion. Prompts are stored in 'prompts/ui-gen.md', including instructions for shadcn/ui, lucide, and nivo charts. Reducing unnecessary component instructions can lower the API cost of each generation. vx.dev is easy to customize. Users can modify existing prompts, switch to other UI libraries, or adjust the coding style. Generated code is stored on GitHub, offering version control and collaboration features. Private repositories ensure the visibility of generated results.