Themes and export backgrounds

The six themes

Theme	Background	Good for
Light	white	documents and slides, the default
Dark	dark grey	dark pages
Ink Teal	warm off-white + teal grey	papers, technical docs
Cinnabar	warm cream + cinnabar red	reports, slides
Indigo	cool white + indigo	business and product docs
Ink Black	deep ink + pale gold	dark settings, easy on the eyes

On desktop, pick one from the thumbnail strip above the preview; on a phone, from the “Theme” panel at the bottom. Your choice is remembered.

Custom theme color (Lite)

The last tile in the theme strip is “Custom”. One click applies a palette built from the default primary color; the panel that opens lets you change it with a native color picker, a hex field, a light / dark base toggle and eight presets. Every change applies immediately; there is no “OK” button. Changing the one primary color moves node fills, borders, lines, groups, Gantt bars and mind-map branches together; a very bright primary (pure yellow, say) is darkened automatically so it stays readable on a light base, and brightened on a dark base.

A custom theme is remembered, travels in share links and is stored with cloud saves, just like the built-in ones. Switch back to a built-in theme and the “Custom” tile starts from your last color. On the free plan the tile shows a lock; the six built-in themes are unchanged.

Dark mode versus diagram theme

The button in the top bar switches the page between light and dark. Until you pick a diagram theme yourself, the diagram follows the page; once you have picked one, dark mode leaves it alone.

Export backgrounds

• PNG: transparent by default, so it sits on any page without a white box; “Solid” uses the theme background.
• SVG: keeps the theme's background setting.
• Word, PowerPoint and PDF: always use the theme background (transparency is not reliable inside these files). Switch to Light first if you need white.

The preview canvas uses the same background, so what you see is what you get.