Web Speech API

Web API enabling speech recognition and text-to-speech synthesis in web apps through SpeechRecognition and SpeechSynthesis interfaces.

Comparee rates Web Speech API 61/100 in Developer APIs & Models — based on catalog data as of June 2026. Methodology.

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About Web Speech API

The Web Speech API enables web applications to incorporate voice data through two main components: Speech Recognition (via SpeechRecognition interface) for recognizing voice input from a device's microphone or audio track, and Speech Synthesis (via SpeechSynthesis interface) for text-to-speech conversion. Developers can use platform-provided speech services or browser-based processing. The API provides event handlers for detecting incoming speech, supports multiple voice types and utterance configurations, and allows apps to respond appropriately to voice input.

speech-recognitiontext-to-speechvoice-inputweb-apiaudio-processingaccessibility

Pros & cons

✓ Pros

✓Native browser API - no external dependencies
✓Supports both speech recognition and synthesis
✓Flexible processing options (platform or local)
✓Rich event handling for real-time feedback
✓Accessibility improvements for voice-based interaction

✗ Cons

✗Browser compatibility varies across platforms
✗Grammar-based features deprecated
✗Requires microphone permissions
✗Platform speech service quality varies by OS

Frequently asked questions

What is Web Speech API?

Web Speech API is a Developer APIs & Models tool: Web API enabling speech recognition and text-to-speech synthesis in web apps through SpeechRecognition and SpeechSynthesis interfaces.

Is Web Speech API free?

Web Speech API offers a free option.

What are the best Web Speech API alternatives?

Based on Comparee's ranking, top alternatives include Bright Data, WebScraping.AI, Morph. See the full ranked list on our Web Speech API alternatives page.

How does Comparee rate Web Speech API?

Web Speech API has a Comparee Score of 61/100 — a transparent, rule-based rating from catalog signals (data completeness, pricing transparency, category fit). Affiliate partnerships never influence the score.