iOS System Blue

UIColor.systemBlue

Semantic Accent & Interactive Tint

Adaptive System Token•iOS 13.0+, iPadOS 13.0+, macCatalyst 13.0+

Complete technical specification and developer reference for System Blue in Apple's iOS & iPadOS design system. In light appearance, it resolves to HEX #007AFF; in dark appearance, it dynamically adapts to HEX #0A84FF. Features wide-gamut Display P3 values, UIKit bridge (UIColor.systemBlue), AppKit bridge (NSColor.systemBlue), WCAG contrast audit, and Xcode drop-in initializers.

Light Mode#007AFF

Dark Mode#0A84FF

System Blue Color Preview

A blue color that adapts to the current trait environment.

ColorUIColor.systemBlue

Copy:

Dynamic Asset

Semantic Accent & Interactive Tint

iOS 13.0+, iPadOS 13.0+, macCatalyst 13.0+

Initializers & Color Spaces

Color(r:g:b:)Color(red: 0.000, green: 0.478, blue: 1.000)

Color(r:g:b:op:)Color(red: 0.000, green: 0.478, blue: 1.000, opacity: 1.00)

Color(hue:sat:bri:)HSBColor(hue: 0.587, saturation: 1.000, brightness: 1.000, opacity: 1.00)

Color(.displayP3)Wide GamutColor(.displayP3, red: 0.204, green: 0.471, blue: 0.965, opacity: 1.00)

Color(.sRGB)Color(.sRGB, red: 0.000, green: 0.478, blue: 1.000, opacity: 1.00)

Color(hex:)ExtensionColor(hex: "#007AFF")

#colorLiteralXcode#colorLiteral(red: 0.000, green: 0.478, blue: 1.000, alpha: 1.00)

Color(uiColor:)iOSColor(uiColor: UIColor(red: 0.000, green: 0.478, blue: 1.000, alpha: 1.00))

Active HEX: #007AFFP3 R: 0.204 G: 0.471 B: 0.965

Technical Color Specifications

Exact resolved HEX codes, sRGB 8-bit components, HSL, and normalized Swift floating-point decimals for Light and Dark modes.

Color Metric / Space	Light Appearance	Dark Appearance	Swift Code Literal
HEX Code	#007AFF	#0A84FF	Color(hex: "#007AFF")
sRGB (0–255)	rgb(0, 122, 255)	rgb(10, 132, 255)	(r: 0.000, g: 0.478, b: 1.000)
Display P3 (Wide Gamut)	P3 (0.204, 0.471, 0.965)	P3 (0.231, 0.510, 0.969)	Color(.displayP3, ...)
HSL / HSB	hsl(211, 100%, 50%)	hsl(210, 100%, 52%)	Color(hue:sat:bri:)
Platform Bridge	UIKit: `UIColor.systemBlue`	AppKit: `NSColor.systemBlue`	Color(uiColor:) / Color(nsColor:)

Light Appearance

Light Theme

HEX Code

#007AFF

RGB (0–255)

rgb(0, 122, 255)

HSL

hsl(211, 100%, 50%)

Normalized Swift Literal:

(r: 0.000, g: 0.478, b: 1.000)

Dark Appearance

Dark Theme

HEX Code

#0A84FF

RGB (0–255)

rgb(10, 132, 255)

HSL

hsl(210, 100%, 52%)

Normalized Swift Literal:

(r: 0.039, g: 0.518, b: 1.000)

Drop-In Developer Snippets

Ready-to-paste code blocks for Xcode asset catalogs and Swift files.

Xcode Location: Save as Contents.json inside Assets.xcassets/System Blue.colorset/

Includes Light + Dark Modes

Contents.json

{
  "colors": [
    {
      "color": {
        "color-space": "srgb",
        "components": {
          "red": "0.000",
          "green": "0.478",
          "blue": "1.000",
          "alpha": "1.000"
        }
      },
      "idiom": "universal"
    },
    {
      "appearances": [
        {
          "appearance": "luminosity",
          "value": "dark"
        }
      ],
      "color": {
        "color-space": "srgb",
        "components": {
          "red": "0.039",
          "green": "0.518",
          "blue": "1.000",
          "alpha": "1.000"
        }
      },
      "idiom": "universal"
    }
  ],
  "info": {
    "author": "xcode",
    "version": 1
  }
}

Live UI Component Sandbox

Preview Color.system blue inside standard Apple interface components.

Interactive Controls

Active TagBadge 99+

Toggle Tint

Container & Typography Styling

●SwiftUI Notification

Just now

Demonstrates how Apple designers pair system background tints with dynamic System Blue accents.

Dynamic Headline in System Blue

.foregroundStyle(UIColor.systemBlue)

Platform Implementation Snippets

Ready-to-use Swift code for SwiftUI, UIKit, and AppKit applications.

UIKit (Swift)

// UIKit (iOS, tvOS, watchOS)
let view = UIView()
view.backgroundColor = UIColor.systemBlue

// Label Tinting
let label = UILabel()
label.textColor = UIColor.systemBlue

// Bridging UIKit into SwiftUI
let swiftUIColor = Color(uiColor: .systemBlue)

WCAG 2.1 Accessibility Contrast Audit

Contrast calculations of System Blue against pure white and iOS OLED dark surfaces.

Light Mode (#007AFF)on White (#FFF)

Contrast Ratio:4.02:1

Normal Text (4.5:1 AA): Fail

Dark Mode (#0A84FF)on Dark (#1C1C1E)

Contrast Ratio:4.66:1

Normal Text (4.5:1 AA): Pass (AA)

Recommended HIG Use Cases

Primary action buttons and tint accents
Status alerts, badges, and notification tags
Active tab bar icons and control highlights

Anti-Patterns to Avoid

Full background fills behind body copy
Unstyled plain paragraph text

Browse More iOS & iPadOS Colors

Quickly jump to other Apple system colors and semantic tokens.

Secondary System Background

Tertiary System Background

System Grouped Background

Frequently Asked Questions

How do I use UIColor.systemBlue in iOS and iPadOS apps?

In UIKit, assign UIColor.systemBlue directly to properties like view.backgroundColor, label.textColor, or tintColor. In SwiftUI, bridge it using Color(uiColor: .systemBlue).

What is the HEX code for iOS System Blue in light and dark mode?

In light appearance, System Blue resolves to #007AFF. In dark appearance, it automatically adapts to #0A84FF.

How do I bridge UIColor.systemBlue into SwiftUI?

In SwiftUI views on iOS 15+, initialize Color(uiColor: .systemBlue) to utilize this system color with full appearance dynamism.

Does System Blue adapt automatically to dark appearance in iOS?

Yes, UIColor.systemBlue is an appearance-aware dynamic UIColor that automatically responds to UITraitCollection changes between light and dark appearances.

Why use UIKit system colors instead of hardcoded hex values?

System colors dynamically adapt to Dark Mode, Accessibility Increase Contrast mode, and future iOS visual refinements without manual color bookkeeping.