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Color provides an intuitive way of communicating information to users in your app: it can be used to indicate interactivity, give feedback to user actions, and give your interface a sense of visual continuity.

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In Windows apps, colors are primarily determined by accent color and theme. In this article, we'll discuss how you can use color in your app, and how to use accent color and theme resources to make your Windows app usable in any theme context.

Color principles

Use color meaningfully.When color is used sparingly to highlight important elements, it can help create a user interface that is fluid and intuitive.

Use color to indicate interactivity.It's a good idea to choose one color to indicate elements of your application that are interactive. For example, many web pages use blue text to denote a hyperlink.

Color is personal.In Windows, users can choose an accent color and a light or dark theme, which are reflected throughout their experience. You can choose how to incorporate the user's accent color and theme into your application, personalizing their experience.

Color is cultural.Consider how the colors you use will be interpreted by people from different cultures. For example, in some cultures the color blue is associated with virtue and protection, while in others it represents mourning.

Themes

Windows apps can use a light or dark application theme. The theme affects the colors of the app's background, text, icons, and common controls.

Light theme

Dark theme

By default, your Windows app's theme is the user’s theme preference from Windows Settings or the device's default theme (i.e., dark on Xbox). However, you can set the theme for your Windows app.

Changing the theme

You can change themes by changing the RequestedTheme property in your App.xaml file.

Removing the RequestedTheme property means that your application will use the user’s system settings.

Users can also select the high contrast theme, which uses a small palette of contrasting colors that makes the interface easier to see. In that case, the system will override your RequestedTheme.

Testing themes

If you don't request a theme for your app, make sure to test your app in both light and dark themes to ensure that your app will be legible in all conditions.

Note: In Visual Studio, the default RequestedTheme is light, so you'll need to change the RequestedTheme to test both.

Theme brushes

Common controls automatically use theme brushes to adjust contrast for light and dark themes.

For example, here's an illustration of how the AutoSuggestBox uses theme brushes:

The theme brushes are used for the following purposes:

Base is for text.
Alt is the inverse of Base.
Chrome is for top-level elements, such as navigation panes or command bars.
List is for list controls.

Low/Medium/High refer to the intensity of the color.

Using theme brushes

When creating templates for custom controls, use theme brushes rather than hard code color values. This way, your app can easily adapt to any theme.

For example, these item templates for ListView demonstrate how to use theme brushes in a custom template.

For more information about how to use theme brushes in your app, see Theme Resources.

Accent color

Common controls use an accent color to convey state information. By default, the accent color is the SystemAccentColor that users select in their Settings. However, you can also customize your app's accent color to reflect your brand.

Overriding the accent color

To change your app's accent color, place the following code in app.xaml.

Choosing an accent color

If you select a custom accent color for your app, please make sure that text and backgrounds that use the accent color have sufficient contrast for optimal readability. To test contrast, you can use the color picker tool in Windows Settings, or you can use these online contrast tools.

Accent color palette

An accent color algorithm in the Windows shell generates light and dark shades of the accent color.

These shades can be accessed as theme resources:

SystemAccentColorLight3
SystemAccentColorLight2
SystemAccentColorLight1
SystemAccentColorDark1
SystemAccentColorDark2
SystemAccentColorDark3

You can also access the accent color palette programmatically with the UISettings.GetColorValue method and UIColorType enum.

You can use the accent color palette for color theming in your app. Below is an example of how you can use the accent color palette on a button.

When using colored text on a colored background, make sure there is enough contrast between text and background. By default, hyperlink or hypertext will use the accent color. If you apply variations of the accent color to the background, you should use a variation of the original accent color to optimize the contrast of colored text on a colored background.

The chart below illustrates an example of the various light/dark shades of accent color, and how colored type can be applied on a colored surface.

For more information about styling controls, see XAML styles.

Color API

There are several APIs that can be used to add color to your application. First, the Colors class, which implements a large list of predefined colors. These can be accessed automatically with XAML properties. In the example below, we create a button and set the background and foreground color properties to members of the Colors class.

You can create your own colors from RGB or hex values using the Color struct in XAML.

You can also create the same color in code by using the FromArgb method.

The letters 'Argb' stands for Alpha (opacity), Red, Green, and Blue, which are the four components of a color. Each argument can range from 0 to 255. You can choose to omit the first value, which will give you a default opacity of 255, or 100% opaque.

Note

If you're using C++, you must create colors by using the ColorHelper class.

The most common use for a Color is as an argument for a SolidColorBrush, which can be used to paint UI elements a single solid color. These brushes are generally defined in a ResourceDictionary, so they can be reused for multiple elements.

For more information on how to use brushes, see XAML brushes.

Scoping system colors

In addition to defining your own colors in your app, you can also scope our systematized colors to desired regions throughout your app by using the ColorPaletteResources tag. This API allows you to not only colorize and theme large groups of controls at once by setting a few properties, but also gives you many other system benefits that you wouldn't normally get with defining your own custom colors manually:

Any color set using ColorPaletteResources will not effect High Contrast
- Meaning your app will be accessible to more people without any additional design or dev cost
Can easily set colors to Light, Dark or pervasive across both themes by setting one property on the API
Colors set o

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