Generate pure tones with configurable frequency and waveform in React Native and Expo — fully compatible with Android, iOS, and Web.

Ideal for educational apps, sound experiments, or musical tools. This module synthesizes audio in real-time, directly from native or web audio engines — no .mp3 files required.

• ✅ Cross-platform: Android, iOS, Web
• 📐 Custom frequency input (e.g. 440Hz for A4)
• 🌊 Selectable waveform: sine, square, triangle, sawtooth
• 🎹 Multi-tone support (chords!)
• ⚙️ Native modules for high-performance audio
• 🔧 Works with React Native CLI and Expo Dev Client

• react-native >= 0.72
• expo >= 50 (if using Expo)
• ❌ Not compatible with Expo Go

You must use a custom Dev Client (via expo run:ios or expo run:android) because this library includes native code.

npm install react-native-pure-tone

npx expo install
npx expo run:android
# or
npx expo run:ios

import { playTone } from 'react-native-pure-tone';

playTone({
  frequency: 440, // A4 note
  duration: 1.5,  // seconds
  waveform: 'sine' // 'square', 'triangle', or 'sawtooth'
});

• Cross-platform tone playback
• Native Swift/Java modules
• Waveform selection
• Notes & chords support
• ADSR envelope support
• MIDI input / on-screen keyboard
• Waveform visualizer

Pull requests are welcome!
Help us shape the first fully-native audio synthesis module for the React Native ecosystem.

Because this is not just a player.
This module synthesizes sound from scratch, enabling real-time tuning, interactivity, and true instrument-like behavior — all without external assets.

MIT © 2025 Salvador Bolanos (Salvariable)