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Web Speech API: Complete Guide & When to Upgrade to Cloud APIs (2025)

· 15 min read

You want to add voice recognition to your web app. You discover Web Speech API - it's free, browser-based, and seems perfect. But is it right for your project?

Here's a quick test:

const recognition = new webkitSpeechRecognition();
recognition.onresult = (event) => {
console.log(event.results[0][0].transcript);
};
recognition.start();

That's it. Free speech recognition in three lines.

This guide covers what Web Speech API is, how to use it, its limitations, and when you need to upgrade to production-grade cloud APIs. By the end, you'll know exactly which approach fits your use case.