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ResponsiveVoice

Core
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Version 2.0.0

First public release of the rebuilt ResponsiveVoice — a complete, TypeScript-first rewrite of the original library, now split into focused, independently-versioned packages.

@responsivevoice/core is the browser text-to-speech client and a drop-in replacement for the legacy responsivevoice.js script — the same speak/cancel/pause/resume API, now fully typed and tree-shakeable. Free and open source.

Highlights

  • Native browser voices (Web Speech API) with automatic fallback to ResponsiveVoice server voices when the browser lacks one
  • Around 100 built-in voices across many languages and genders via a language-matching resolution chain — and thousands more through premium providers (Microsoft Azure, OpenAI, Google Cloud, and more) via Bring Your Own Key
  • Per-utterance callbacks (onstart/onend/onerror/onboundary) and global events, reliable across interruptions
  • Optional streaming playback — HTTP audio or WebSocket streaming — so speech starts before the full clip is ready
  • Server voices come from the v2 REST API, documented by a published OpenAPI 3.1 specification
  • Automatic iOS and Android audio unlocking via a built-in, customizable permission prompt
  • Voice catalog fetched and cached at runtime — new voices and quality improvements arrive continuously, no package upgrade required
  • Ships ESM, CJS, and a tree-shakeable browser bundle, also on the CDN at https://cdn.responsivevoice.org/sdk/latest/responsivevoice.js

Part of the ResponsiveVoice ecosystem: @responsivevoice/api-client (REST & WebSocket client), @responsivevoice/features (dashboard plugins), @responsivevoice/text (text processing), @responsivevoice/types (schemas & types).

Documentation: https://docs.responsivevoice.org