The online theme editor

Start in this order

1. Open the editor and choose an official theme from Presets.
2. Choose Copy and edit to make a custom theme. Presets themselves cannot be changed.
3. Switch Light or Dark and change the tokens you care about.
4. When validation passes, explicitly save it to My themes.

Open the online editor

Automatic preview is not saving

Every valid change previews atomically; an invalid draft is never partially applied. Saving is a separate explicit action. Closing, switching themes, or refreshing protects an unsaved draft so you can keep editing or discard it.

Import and export

Use .oria-theme.json to keep or move a theme. Imported JSON goes through complete Contract validation again; an invalid file never partly overwrites the current theme.

Processed locally by default

The first release has no accounts, cloud saving, theme marketplace, or remote sync. Theme content stays in the current browser by default; exported files are yours to keep.