voice_anim_kit

A pure Flutter package offering 9 stunning, highly customizable recording and voice animation visualizers. No platform dependencies, blazing fast, and incredibly simple to use.

Whether you're building a voice assistant, a chat app with audio messages, or a music player, voice_anim_kit provides the perfect aesthetic feedback for your audio streams.

✨ Features

9 Distinct Styles: Wave, Bar, Circle, Blob, Line, Particle, Ripple, AI Gaze, and Glow Bar.
Zero External Dependencies: 100% pure Dart & Flutter Canvas — no third-party packages required.
Built-in Smoothing: Integrated exponential smoothing low-pass filter prevents jitter from raw hardware noise.
Elegant Animations: Built-in fade-in / fade-out transitions when recording starts or stops.
High Aesthetics: Out-of-the-box support for beautiful glows, morphing, chromatic glitching, and physics-based animations.
Interactive: GlowBarVisualizer responds to finger drag to create a 2D positional glow effect.
Highly Responsive: Handles rapid amplitude changes seamlessly with fluid state transitions.

📸 Preview

🚀 Getting Started

Add voice_anim_kit to your pubspec.yaml:

dependencies:
  voice_anim_kit: ^0.2.0

Then run:

flutter pub get

Import it in your Dart file:

import 'package:voice_anim_kit/voice_anim_kit.dart';

💻 Basic Usage

All visualizers share the same minimal API. You only need two required properties:

Property	Type	Description
`isRecording`	`bool`	Whether audio recording is active. Drives fade-in/out animations.
`amplitude`	`double`	Normalized audio level between `0.0` (silence) and `1.0` (peak).

WaveVisualizer(
  isRecording: _isRecording, // true or false
  amplitude: _currentAmplitude, // 0.0 to 1.0
  color: Colors.blueAccent, // optional: defaults to Theme.primaryColor
  height: 60.0,             // optional
)

Feeding Amplitude from a Real Microphone

The package is agnostic to your audio recording stack. Here's how to wire common packages:

Using the record package:

final recorder = AudioRecorder();

// Poll amplitude every 50ms (~20fps)
Timer.periodic(const Duration(milliseconds: 50), (_) async {
  final amp = await recorder.getAmplitude();
  // amp.current is in dB (-160 to 0). Normalize to 0.0-1.0:
  final normalized = ((amp.current + 50) / 50).clamp(0.0, 1.0);
  setState(() => _amplitude = normalized);
});

The visualizers internally apply a noise floor threshold and exponential smoothing filter — you can feed fast, raw data without worrying about visual stuttering.

🎨 Visualizer Gallery

1. `WaveVisualizer`

Multi-layered overlapping sine waves with a glowing aura. Inspired by modern voice assistants (Siri, Google Assistant).

WaveVisualizer(
  isRecording: _isRecording,
  amplitude: _amplitude,
  color: Colors.cyanAccent,
  height: 80.0,
)

2. `BarVisualizer`

Center-symmetric equalizer frequency bars that dance with the audio. Classic and clean.

BarVisualizer(
  isRecording: _isRecording,
  amplitude: _amplitude,
  color: Colors.greenAccent,
  height: 60.0,
)

3. `CircleVisualizer`

Pulsating radial circles that expand gracefully outwards like ripples in water.

CircleVisualizer(
  isRecording: _isRecording,
  amplitude: _amplitude,
  color: Colors.blueAccent,
  radius: 40.0,
)

4. `BlobVisualizer`

An organic, morphing metaball that deforms based on voice intensity. Feels alive.

BlobVisualizer(
  isRecording: _isRecording,
  amplitude: _amplitude,
  color: Colors.purpleAccent,
  size: 120.0,
)

5. `LineVisualizer`

A single, minimal ECG-style flatline that spikes sharply on loud noise. Perfect for a minimalist UI.

LineVisualizer(
  isRecording: _isRecording,
  amplitude: _amplitude,
  color: Colors.white,
  height: 50.0,
)

6. `ParticleVisualizer`

Floating orbs that bounce and rise with the audio waves. Creates a dreamy, magical effect.

ParticleVisualizer(
  isRecording: _isRecording,
  amplitude: _amplitude,
  color: Colors.amberAccent,
  height: 80.0,
)

7. `RippleVisualizer`

A classic, solid dot with expanding halo rings. Simple and satisfying.

RippleVisualizer(
  isRecording: _isRecording,
  amplitude: _amplitude,
  color: Colors.tealAccent,
  radius: 24.0,
)

8. `AIGazeVisualizer` (New in v0.2.0)

HAL-9000 inspired mutated eyeball with:

Breathing effect — subtle pulse even in silence
Iris detail — radiating fiber lines with phase-twist
Amplitude-reactive pupil — expands from 25% to 75% of the widget
Chromatic glitch — cyan/red stereo separation + jagged contour at amplitude > 0.6

AIGazeVisualizer(
  isRecording: _isRecording,
  amplitude: _amplitude,
  color: Colors.redAccent,
  size: 120.0,
)

9. `GlowBarVisualizer` (New in v0.2.0)

Equalizer-style dot/bar columns featuring a dual-layer interactive glow system:

Static outer glow — Atmospheric halo fixed at the bottom center, creates depth
Dynamic inner glow — Follows the user's finger position in 2D across the widget
Proximity-based bar brightness — Bars closest to the finger are brightest

GlowBarVisualizer(
  isRecording: _isRecording,
  amplitude: _amplitude,
  color: const Color(0xFF00E5FF),
  height: 120.0,
  barCount: 45,    // optional, default 45
  barWidth: 4.0,   // optional, default 4.0
  barSpacing: 4.0, // optional, default 4.0
)

Tip: This visualizer is best used on a dark background where the glow can truly shine.

🛠 Full API Reference

All visualizers share a common parameter structure for easy swapping:

Parameter	Type	Default	Applies To
`isRecording`	`bool`	(required)	All
`amplitude`	`double`	(required)	All
`color`	`Color?`	`Theme.primaryColor`	All
`animationDuration`	`Duration`	`3000ms`	All
`height`	`double`	`60.0`	Wave, Bar, Line, Particle, GlowBar
`radius`	`double`	`32.0`	Circle, Ripple
`size`	`double`	`120.0`	Blob, AIGaze
`barCount`	`int`	`45`	GlowBar
`barWidth`	`double`	`4.0`	GlowBar
`barSpacing`	`double`	`4.0`	GlowBar

Smoothing & Noise Floor

All visualizers apply internal smoothing automatically:

Noise floor: Amplitudes below ~5% are clamped to zero, preventing idle flickering.
Exponential smoothing (EMA): Rapid spikes are smoothed over several frames for a pleasing visual result. You can still feed raw 50ms polling data directly.

📁 Project Structure

voice_anim_kit/
├── lib/
│   ├── voice_anim_kit.dart        ← Public exports
│   └── src/
│       ├── core/
│       │   ├── visualizer_mixin.dart  ← Shared animation lifecycle
│       │   └── paint_utils.dart       ← Shared canvas utilities
│       └── visualizers/
│           ├── wave_visualizer.dart
│           ├── bar_visualizer.dart
│           ├── circle_visualizer.dart
│           ├── blob_visualizer.dart
│           ├── line_visualizer.dart
│           ├── particle_visualizer.dart
│           ├── ripple_visualizer.dart
│           ├── ai_gaze_visualizer.dart
│           └── glow_bar_visualizer.dart
└── example/                       ← Full interactive demo app

🧪 Running the Example

cd example
flutter pub get
flutter run

The example app features:

Live microphone input mode (permissions handled automatically)
Manual amplitude slider for testing without a mic
Color picker with 8 preset palette colors
Style switcher to preview all 9 visualizers

📝 License

MIT License. See LICENSE for details.

Feel free to use this in personal and commercial projects.

🤝 Contributing

Issues and PRs are welcome at github.com/BrotherPeng/voice_anim_kit.

voice_anim_kit

✨ Features

📸 Preview

🚀 Getting Started

💻 Basic Usage

Feeding Amplitude from a Real Microphone

🎨 Visualizer Gallery

1. `WaveVisualizer`

2. `BarVisualizer`

3. `CircleVisualizer`

4. `BlobVisualizer`

5. `LineVisualizer`

6. `ParticleVisualizer`

7. `RippleVisualizer`

8. `AIGazeVisualizer` (New in v0.2.0)

9. `GlowBarVisualizer` (New in v0.2.0)

🛠 Full API Reference

Smoothing & Noise Floor

📁 Project Structure

🧪 Running the Example

📝 License

🤝 Contributing

Libraries

voice_anim_kit package

voice_anim_kit

✨ Features

📸 Preview

🚀 Getting Started

💻 Basic Usage

Feeding Amplitude from a Real Microphone

🎨 Visualizer Gallery

1. WaveVisualizer

2. BarVisualizer

3. CircleVisualizer

4. BlobVisualizer

5. LineVisualizer

6. ParticleVisualizer

7. RippleVisualizer

8. AIGazeVisualizer (New in v0.2.0)

9. GlowBarVisualizer (New in v0.2.0)

🛠 Full API Reference

Smoothing & Noise Floor

📁 Project Structure

🧪 Running the Example

📝 License

🤝 Contributing

Libraries

voice_anim_kit package

1. `WaveVisualizer`

2. `BarVisualizer`

3. `CircleVisualizer`

4. `BlobVisualizer`

5. `LineVisualizer`

6. `ParticleVisualizer`

7. `RippleVisualizer`

8. `AIGazeVisualizer` (New in v0.2.0)

9. `GlowBarVisualizer` (New in v0.2.0)