How do I build a read-aloud mode for an accessibility feature?

To build a read-aloud accessibility mode, think in terms of capturing text, converting it to speech, and giving the user control over playback.

Core pieces

1. Identify the content to read

• Determine which UI text should be spoken:
  • selected text
  • current paragraph/article
  • focused element
  • page content
• Prefer a logical reading order, not raw DOM order if your layout is complex.

2. Use a text-to-speech engine

Common options:

• Web: SpeechSynthesis API
• iOS: AVSpeechSynthesizer
• Android: TextToSpeech
• Backend-generated audio: cloud TTS services like Amazon Polly, Google Cloud TTS, Azure TTS

For most app-side accessibility features, native device TTS is simplest.

3. Add playback controls

Users should be able to:

• play / pause
• stop
• skip forward/back
• change speed
• change voice, pitch, language
• see what is currently being read

4. Sync spoken text with highlighting

If possible:

• highlight the current sentence/word
• scroll content into view
• show a “reading cursor” This greatly improves usability.

5. Respect accessibility standards

• Support keyboard navigation
• Make controls screen-reader friendly
• Don’t auto-play speech unexpectedly
• Preserve focus and user control
• Provide captions/transcripts if audio is used elsewhere

Basic web example

If you’re building for the browser, you can start with the Web Speech API:

<button onclick="speakText()">Read Aloud</button>
<button onclick="pauseSpeech()">Pause</button>
<button onclick="resumeSpeech()">Resume</button>
<button onclick="stopSpeech()">Stop</button>

<script>
let utterance;

function speakText() {
  const text = document.getElementById("content").innerText;
  utterance = new SpeechSynthesisUtterance(text);
  utterance.lang = "en-US";
  utterance.rate = 1;
  speechSynthesis.speak(utterance);
}

function pauseSpeech() {
  speechSynthesis.pause();
}

function resumeSpeech() {
  speechSynthesis.resume();
}

function stopSpeech() {
  speechSynthesis.cancel();
}
</script>

<div id="content">
  This is the text that will be read aloud.
</div>

Better implementation tips

Split content into chunks

Long text works better if you:

• break it into sentences or paragraphs
• queue utterances one by one
• allow resuming from the last sentence

Handle voices and languages

• Detect user locale
• Offer voice selection
• Support multilingual content if your app contains it

Support mobile platforms

If building native apps:

• use system TTS
• let users configure accessibility settings
• test with VoiceOver and TalkBack

Avoid common pitfalls

• Don’t read out hidden or irrelevant UI text
• Don’t interrupt speech on minor UI changes
• Don’t rely only on color or visual cues
• Don’t assume text size is enough; read order matters

Recommended architecture

A simple pattern:

1. Content extractor gets readable text
2. Reading controller manages current position, pause/resume/stop
3. TTS adapter talks to platform speech APIs
4. UI layer shows controls and current highlight
5. Accessibility layer exposes proper labels and focus handling

If you want the best user experience

Add:

• sentence-by-sentence navigation
• “tap to read this paragraph”
• adjustable reading speed
• word highlighting
• offline support if possible
• remembered user preferences

If you want, I can give you:

1. a web implementation,
2. a React component, or
3. a native iOS/Android version.