🔮 liquid_glass

Apple-inspired Liquid Glass UI effects for Flutter.

A Flutter-native recreation of the liquid glass aesthetic introduced in Apple's visionOS and iOS 26, featuring:

🌊 Refraction — distorts the background through the glass
🌈 Chromatic dispersion — RGB fringe on the edges
💎 Fresnel reflection — bright rim glow at glancing angles
✨ Specular glare — animated diagonal highlight
🫧 Blob merging — shapes smoothly merge when close
🌫 Gaussian blur — BackdropFilter-based background blur
🎨 Presets — appleDefault, subtle, bold
🏃 Animations — spring-based and looping shimmer

No native plugins required. Works on iOS, Android, Web, macOS, Windows, Linux.

Installation

dependencies:
  liquid_glass: ^0.1.0

Quick start

import 'package:liquid_glass/liquid_glass.dart';

// Wrap any widget in a glass pane
LiquidGlassWidget(
  width: 200,
  height: 80,
  config: LiquidGlassConfig.appleDefault,
  child: Center(
    child: Text('Hello', style: TextStyle(color: Colors.white)),
  ),
)

Important: LiquidGlassWidget uses BackdropFilter for the blur layer.
Place it over a painted background (image, gradient, etc.) to see the full effect.

Widgets

`LiquidGlassWidget`

The primary single-pane glass widget.

Property	Type	Default	Description
`width`	`double?`	—	Pane width (ignored when `expand: true`)
`height`	`double?`	—	Pane height
`expand`	`bool`	`false`	Fill parent
`config`	`LiquidGlassConfig`	`appleDefault`	All visual settings
`child`	`Widget?`	—	Content rendered on the glass
`animation`	`Animation<double>?`	(internal loop)	Drive shimmer externally
`customPathBuilder`	`Path Function(Size)?`	—	Custom clip path

`LiquidGlassBlobGroup`

Renders multiple glass shapes that smoothly merge when close.

LiquidGlassBlobGroup(
  config: LiquidGlassConfig.appleDefault,
  blobs: [
    LiquidGlassBlob(position: Offset(20, 40), size: Size(120, 50)),
    LiquidGlassBlob(position: Offset(100, 48), size: Size(120, 50)),
  ],
)

Configuration

`LiquidGlassConfig`

const LiquidGlassConfig(
  shape: LiquidGlassShape.roundedRect,  // roundedRect | circle | capsule | custom
  borderRadius: 24.0,
  refraction: RefractionConfig(
    strength: 0.18,       // 0–1, how much the background is bent
    dispersion: 0.012,    // chromatic aberration split
    edgeSoftness: 0.06,   // fringe band width
  ),
  fresnel: FresnelConfig(
    enabled: true,
    intensity: 0.55,
    power: 3.5,           // sharpness of the rim
    color: Colors.white,
  ),
  glare: GlareConfig(
    enabled: true,
    opacity: 0.35,
    angle: -35.0,         // degrees
    size: 0.6,
    hardness: 0.25,       // 0 = soft, 1 = hard
    color: Colors.white,
  ),
  blur: BlurConfig(
    sigma: 18.0,
    enabled: true,
  ),
  tint: TintConfig(
    color: Color(0x22FFFFFF),
    saturationBoost: 0.0,
  ),
  blob: BlobConfig(
    enabled: true,
    mergeRadius: 32.0,
    smoothness: 28.0,
  ),
  shadows: [BoxShadow(...)],
)

Built-in presets

LiquidGlassConfig.appleDefault  // standard visionOS-like glass
LiquidGlassConfig.subtle        // very light touch
LiquidGlassConfig.bold          // dramatic refraction + heavy blur

Animations

Auto shimmer

Every LiquidGlassWidget runs a built-in 5-second looping shimmer that gently animates the glare and refraction fringe. Pass your own Animation<double> via the animation property to drive it externally.

Spring animations

import 'package:liquid_glass/liquid_glass.dart';

SpringSizeAnimation(
  targetSize: Size(200, 80),
  spring: LiquidGlassSprings.snappy,
  builder: (context, size) => LiquidGlassWidget(
    width: size.width,
    height: size.height,
    config: LiquidGlassConfig.appleDefault,
  ),
)

Available spring presets: LiquidGlassSprings.gentle, .snappy, .bouncy.

Shimmer mixin

class _MyState extends State<MyWidget>
    with SingleTickerProviderStateMixin, LiquidGlassShimmerMixin {
  @override
  Widget build(BuildContext context) {
    return LiquidGlassWidget(
      animation: shimmerAnimation,
      config: LiquidGlassConfig.appleDefault,
    );
  }
}

Custom shapes

LiquidGlassWidget(
  width: 200,
  height: 100,
  config: LiquidGlassConfig.appleDefault.copyWith(
    shape: LiquidGlassShape.custom,
  ),
  customPathBuilder: (size) {
    // Draw a star, speech bubble, etc.
    final path = Path();
    // ... your path commands ...
    return path;
  },
)

SDF utilities

The LiquidGlassShapes class exposes the underlying signed-distance functions if you want to build your own effects:

// Scalar smooth-minimum (blob merge basis)
double merged = LiquidGlassShapes.smin(distA, distB, smoothness);

// Is a point inside a rounded rect?
double d = LiquidGlassShapes.sdfRoundedRect(point, rect, radius);
// d < 0  →  inside
// d >= 0 →  outside

Running the example

cd example
flutter run

Technical notes

The blur layer is implemented with Flutter's built-in BackdropFilter + ImageFilter.blur, which delegates to the platform's GPU compositor.
Refraction, Fresnel, and glare are rendered in software via CustomPainter using ui.Gradient.radial, blend modes, and MaskFilter.
The blob-merge path is computed with Path.combine(PathOperation.union) supplemented by a dilation-erosion approximation.
For pixel-perfect SDF-based merging on GPU, you can integrate Flutter's FragmentProgram API with the GLSL shaders in shaders/ (see TODO).