Block Definition Diagram on Arc Dark Contrast (Material) theme
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Turn on dark theme (Material)

You can choose your preferred theme to apply to Astah from [View] – [Look & Feel] – [Dark Themes (Material)] in main menu. Available product and version are as below:

  • Astah Professional, UML and Viewer version 9.0 and later
  • Astah System Safety version 8.0 and later

Background of Diagram Editor

Currently, themes do not apply to diagram editor’s background color. If you want to tune it up to fit the dark surface, you can change it from the option below:

  • Astah Professional and UML : [Tools] – [System Properties] – [Diagram Editor] – [Background color]
  • Astah System Safety: [Tools] – [System Properties] – [Basic] – [Diagram Editor] – [Background color]
Dark background color of diagram editor
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Pre-installed Themes

There are nearly 70 pre-installed themes you can choose from. Here’re the previews of each one of them.
Or you can see the best 8 themes we recommend.

To see all available themes, please pick the category.

  1. Light Theme
  2. Dark Theme
  3. Dark Themes (Material)
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Available Dark Themes (Material)

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Arc Dark (Material)

Dark Theme - Arc Dark (Material)

Arc Dark Contrast (Material)

Dark Theme - Arc Dark Contrast (Material)

Atom One Dark (Material)

Dark Theme - Atom One Dark (Material)

Atom One Dark Contrast (Material)

Dark theme - Atom One Dark Contrast (Material)

Dracula (Material)

Dark Theme - Dracula Material

Dracula Contrast (Material)

Dark Theme - Dracula Contrast (Material)

GitHub Dark (Material)

Dark Theme - GitHub Dark (Material)

GitHub Dark Contrast (Material)

Dark Theme - GitHub Dark Contrast (Material)

Material Darker (Material)

Dark Theme - Material Darker

Material Darker Contrast (Material)

Dark Theme - Material Darker Contrast (Material)

Material Deep Ocean (Material)

Dark Theme - Material Deep Ocean (Material)

Material Deep Ocean Contrast (Material)

Dark Theme - Material Deep Ocean Contrast (Material)

Material Oceanic (Material)

Dark Theme - Material Oceanic (Material)

Material Oceanic Contrast (Material)

Dark Theme - Material Oceanic Contrast (Material)

Material Palenight (Material)

Dark Theme - Material Palenight (Material)

Material Palenight Contrast (Material)

Dark Theme - Material Palenight Contrast (Material)

Monokai Pro (Material)

Dark Theme - Monokai Pro (Material)

Monokai Pro Contrast (Material)

Dark Theme - Monokai Pro Contrast (Material)

Moonlight (Material)

Dark Theme - Moonlight (Material)

Moonlight Contrast (Material)

Dark theme - Moonlight Contrast (Material)

Night Owl (Material)

Dark Theme - Night Owl (Material)

Night Owl Contrast (Material)

Dark Theme - Night Owl Contrast (Material)

Solarized Dark (Material)

Dark Theme - Solarized Dark (Material)

Solarized Dark Contrast (Material)

Dark Theme - Solarized Dark Contrast Material