Add to ChromeWindows XP (Luna) theme for ChatGPT, Claude and Gemini
Glossy Luna blue, warm ivory panels, rounded title bars and a green Start button. Back to 2001, with today's AI inside.
Free · chatgpt.com, claude.ai and gemini.google.com · Off in one key with Alt+Shift+T
The Luna XP look, 2001
Windows XP launched on October 25, 2001 with Luna, a visual style that swapped the grey bevels of the 90s for rounded, glossy blue title bars and a big green Start button. Its default UI font was Tahoma.
The Luna XP theme wraps ChatGPT, Claude or Gemini in that window: blue gradient title bar, ivory panels for the sidebar and messages, and soft rounded corners. It is the most requested nostalgia look after Windows 95.
- Blue gradient title bar with rounded top corners
- Warm ivory panels and soft shadows
- Green Start-style button
- Tahoma-style UI type with system fallbacks
What changes
- Base
- Light
- Font
- Tahoma
- Code font
- Monospace
- Corners
- 2px radius
- Frame
- winxp
- Effects
- None
- Palette
Nothing is hidden, moved or covered. Frames are decoration around the app and never sit over the input, menus or send button.
Luna XP on ChatGPT, Claude and Gemini
One theme, every app. Pick it once and it follows you across chatgpt.com, claude.ai and gemini.google.com.
How to use the Luna XP theme
- 1
Install ChatTheme
Add the free ChatTheme extension to Chrome, Edge, Brave or Arc from the Chrome Web Store.
- 2
Open ChatGPT, Claude or Gemini
Go to chatgpt.com, claude.ai or gemini.google.com and click the ChatTheme icon in the toolbar to open the side panel.
- 3
Pick Luna XP
Click Luna XP in the Themes tab. It applies instantly without reloading. Press Alt+Shift+T any time to switch back to the stock look.
Want a variation? Open the Create tab and type something like “Luna XP but pink” or “add stickers”. AI edits the theme live and you can undo any step.