Getting Started

Install

bun add @capgo/capacitor-speech-synthesis
bunx cap sync

Import

import { SpeechSynthesis } from '@capgo/capacitor-speech-synthesis';

API Overview

speak

Speaks the given text with specified options. The utterance is added to the speech queue.

import { SpeechSynthesis } from '@capgo/capacitor-speech-synthesis';

const result = await SpeechSynthesis.speak({
  text: 'Hello, world!',
  language: 'en-US',
  rate: 1.0,
  pitch: 1.0,
  volume: 1.0,
  queueStrategy: 'Add'
});
console.log('Utterance ID:', result.utteranceId);

synthesizeToFile

Synthesizes speech to an audio file (Android/iOS only). Returns the file path where the audio was saved.

import { SpeechSynthesis } from '@capgo/capacitor-speech-synthesis';

const result = await SpeechSynthesis.synthesizeToFile({
  text: 'Hello, world!',
  language: 'en-US'
});
console.log('Audio file saved at:', result.filePath);

cancel

Cancels all queued utterances and stops current speech.

import { SpeechSynthesis } from '@capgo/capacitor-speech-synthesis';

await SpeechSynthesis.cancel();

pause

Pauses speech immediately.

import { SpeechSynthesis } from '@capgo/capacitor-speech-synthesis';

await SpeechSynthesis.pause();

resume

Resumes paused speech.

import { SpeechSynthesis } from '@capgo/capacitor-speech-synthesis';

await SpeechSynthesis.resume();

isSpeaking

Checks if speech synthesis is currently speaking.

import { SpeechSynthesis } from '@capgo/capacitor-speech-synthesis';

const { isSpeaking } = await SpeechSynthesis.isSpeaking();
console.log('Is speaking:', isSpeaking);

isAvailable

Checks if speech synthesis is available on the device.

import { SpeechSynthesis } from '@capgo/capacitor-speech-synthesis';

const { isAvailable } = await SpeechSynthesis.isAvailable();
if (isAvailable) {
  console.log('Speech synthesis is available');
}

getVoices

Gets all available voices.

import { SpeechSynthesis } from '@capgo/capacitor-speech-synthesis';

const { voices } = await SpeechSynthesis.getVoices();
voices.forEach(voice => {
  console.log(`${voice.name} (${voice.language})`);
});

getLanguages

Gets all available languages.

import { SpeechSynthesis } from '@capgo/capacitor-speech-synthesis';

const { languages } = await SpeechSynthesis.getLanguages();
console.log('Available languages:', languages);

isLanguageAvailable

Checks if a specific language is available.

import { SpeechSynthesis } from '@capgo/capacitor-speech-synthesis';

const { isAvailable } = await SpeechSynthesis.isLanguageAvailable({
  language: 'es-ES'
});
console.log('Spanish available:', isAvailable);

isVoiceAvailable

Checks if a specific voice is available.

import { SpeechSynthesis } from '@capgo/capacitor-speech-synthesis';

const { isAvailable } = await SpeechSynthesis.isVoiceAvailable({
  voiceId: 'com.apple.ttsbundle.Samantha-compact'
});
console.log('Voice available:', isAvailable);

initialize

Initializes the speech synthesis engine (iOS optimization). This can reduce latency for the first speech request.

import { SpeechSynthesis } from '@capgo/capacitor-speech-synthesis';

await SpeechSynthesis.initialize();

activateAudioSession

Activates the audio session with a specific category (iOS only).

import { SpeechSynthesis } from '@capgo/capacitor-speech-synthesis';

await SpeechSynthesis.activateAudioSession({
  category: 'Playback'
});

deactivateAudioSession

Deactivates the audio session (iOS only).

import { SpeechSynthesis } from '@capgo/capacitor-speech-synthesis';

await SpeechSynthesis.deactivateAudioSession();

Type Reference

SpeakOptions

Options for speaking text.

export interface SpeakOptions {
  /**
   * The text to speak.
   *
   * @since 1.0.0
   */
  text: string;

  /**
   * The BCP-47 language tag (e.g., 'en-US', 'es-ES').
   *
   * @since 1.0.0
   */
  language?: string;

  /**
   * The voice identifier to use.
   *
   * @since 1.0.0
   */
  voiceId?: string;

  /**
   * The pitch of the voice (0.5 to 2.0, default: 1.0).
   *
   * @since 1.0.0
   */
  pitch?: number;

  /**
   * The speaking rate (0.1 to 10.0, default: 1.0).
   *
   * @since 1.0.0
   */
  rate?: number;

  /**
   * The volume (0.0 to 1.0, default: 1.0).
   *
   * @since 1.0.0
   */
  volume?: number;

  /**
   * The queue strategy: 'Add' to append or 'Flush' to replace queue.
   * Default: 'Add'
   *
   * @since 1.0.0
   */
  queueStrategy?: 'Add' | 'Flush';
}

SpeakResult

Result from speaking text.

export interface SpeakResult {
  /**
   * Unique identifier for this utterance.
   *
   * @since 1.0.0
   */
  utteranceId: string;
}

SynthesizeToFileResult

Result from synthesizing to file.

export interface SynthesizeToFileResult {
  /**
   * The file path where audio was saved.
   *
   * @since 1.0.0
   */
  filePath: string;

  /**
   * Unique identifier for this utterance.
   *
   * @since 1.0.0
   */
  utteranceId: string;
}

VoiceInfo

Information about a voice.

export interface VoiceInfo {
  /**
   * Unique voice identifier.
   *
   * @since 1.0.0
   */
  id: string;

  /**
   * Display name of the voice.
   *
   * @since 1.0.0
   */
  name: string;

  /**
   * BCP-47 language code.
   *
   * @since 1.0.0
   */
  language: string;

  /**
   * Gender of the voice (iOS only).
   *
   * @since 1.0.0
   */
  gender?: 'male' | 'female' | 'neutral';

  /**
   * Whether this voice requires a network connection.
   *
   * @since 1.0.0
   */
  isNetworkConnectionRequired?: boolean;

  /**
   * Whether this is the default voice (Web only).
   *
   * @since 1.0.0
   */
  default?: boolean;
}

IsLanguageAvailableOptions

Options for checking language availability.

export interface IsLanguageAvailableOptions {
  /**
   * The BCP-47 language code to check.
   *
   * @since 1.0.0
   */
  language: string;
}

IsVoiceAvailableOptions

Options for checking voice availability.

export interface IsVoiceAvailableOptions {
  /**
   * The voice ID to check.
   *
   * @since 1.0.0
   */
  voiceId: string;
}

ActivateAudioSessionOptions

Options for activating the audio session (iOS only).

export interface ActivateAudioSessionOptions {
  /**
   * The audio session category.
   * - 'Ambient': Mixes with other audio
   * - 'Playback': Stops other audio
   *
   * @since 1.0.0
   */
  category: 'Ambient' | 'Playback';
}

UtteranceEvent

Event emitted when utterance starts or ends.

export interface UtteranceEvent {
  /**
   * The utterance identifier.
   *
   * @since 1.0.0
   */
  utteranceId: string;
}

BoundaryEvent

Event emitted at word boundaries.

export interface BoundaryEvent {
  /**
   * The utterance identifier.
   *
   * @since 1.0.0
   */
  utteranceId: string;

  /**
   * The character index in the text.
   *
   * @since 1.0.0
   */
  charIndex: number;

  /**
   * The character length of the current word.
   *
   * @since 1.0.0
   */
  charLength?: number;
}

ErrorEvent

Event emitted on synthesis error.

export interface ErrorEvent {
  /**
   * The utterance identifier.
   *
   * @since 1.0.0
   */
  utteranceId: string;

  /**
   * The error message.
   *
   * @since 1.0.0
   */
  error: string;
}

Source Of Truth

This page is generated from the plugin’s src/definitions.ts. Re-run the sync when the public API changes upstream.

Keep going from Getting Started

If you are using Getting Started to plan dashboard and API operations, connect it with Using @capgo/capacitor-speech-synthesis for the native capability in Using @capgo/capacitor-speech-synthesis, API Overview for the implementation detail in API Overview, Introduction for the implementation detail in Introduction, API Keys for the implementation detail in API Keys, and Devices for the implementation detail in Devices.