# Page Not Found

The URL `app-development/apps-with-gui/classes-mapping` does not exist.

You might be looking for one of these pages:
- [Apps with GUI](https://developer.supervisely.com/app-development/apps-with-gui.md)
- [ClassesMapping](https://developer.supervisely.com/app-development/widgets/input/classesmapping.md)
- [App in the Image Labeling Tool](https://developer.supervisely.com/app-development/apps-with-gui/labeling-tool-app.md)
- [App in the Video Labeling Tool](https://developer.supervisely.com/app-development/apps-with-gui/video-labeling-tool-app.md)
- [Hello World!](https://developer.supervisely.com/app-development/apps-with-gui/hello-world.md)

## How to find the correct page

1. **Browse the full index**: [/sitemap.md](https://developer.supervisely.com/sitemap.md) - Complete documentation index
2. **View the full content**: [/llms-full.txt](https://developer.supervisely.com/llms-full.txt) - Full content export

## Tips for requesting documentation

- For markdown responses, append `.md` to URLs (e.g., `/app-development/apps-with-gui.md`)
- Use `Accept: text/markdown` header for content negotiation