- Apply color profiles to your images. To ensure that colors are correctly matched to this color space, make sure your images include embedded color profiles.
- Use wide color to enhance the visual experience on compatible displays
- Provide color space-specific image and color variations when the experience calls for it.
- Preview your app’s colors on actual sRGB and wide color displays.

University of Michigan - Ann Arbor

Color is a great way to impart vitality, provide visual continuity, communicate status information, give feedback in response to user actions, and help people visualize data.
- Use color judiciously for communication. The power of color to call attention to important information is heightened when used sparingly.
- Use complementary colors throughout your app. The colors in your app should work well together, not conflict or distract.
- In general, choose a limited color palette that coordinates with your app logo. Subtle use of color is a great way to communicate your brand.
- Consider choosing a tint color to indicate interactivity throughout your app. If you define a tint color that denotes interactivity, make sure other colors don’t compete.
- Provide two versions of your tint color to make sure it looks good in both light and dark modes.
- Avoid using the same color for interactive and noninteractive elements.
- Consider how artwork and translucency affect nearby colors.
- Test your app’s color scheme under a variety of lighting conditions.
- Consider how your use of color might be perceived in other countries and cultures. 
- Avoid using colors that make it hard for people to perceive content in your app.

iOS: Color

Apple Human Interface Guidelines

iOS offers a range of system colors that automatically adapt to vibrancy and changes in accessibility settings like Increase Contrast and Reduce Transparency. The system colors look great individually and in combination, on both light and dark backgrounds, and in both light and dark modes. Don't hard-code system color values in your app. 

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