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index.md
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---
title: "SpeechRecognitionAlternative: confidence property"
short-title: confidence
slug: Web/API/SpeechRecognitionAlternative/confidence
page-type: web-api-instance-property
browser-compat: api.SpeechRecognitionAlternative.confidence
---
{{APIRef("Web Speech API")}}
The **`confidence`** read-only property of the
{{domxref("SpeechRecognitionResult")}} interface returns a numeric estimate of how
confident the speech recognition system is that the recognition is correct.
> **Note:** Mozilla's implementation of `confidence` is still
> being worked on — at the moment, it always seems to return 1.
## Value
A number between 0 and 1.
## Examples
This code is excerpted from our
[Speech color changer](https://github.com/mdn/dom-examples/blob/main/web-speech-api/speech-color-changer/script.js) example.
```js
recognition.onresult = (event) => {
// The SpeechRecognitionEvent results property returns a SpeechRecognitionResultList object
// The SpeechRecognitionResultList object contains SpeechRecognitionResult objects.
// It has a getter so it can be accessed like an array
// The first [0] returns the SpeechRecognitionResult at position 0.
// Each SpeechRecognitionResult object contains SpeechRecognitionAlternative objects
// that contain individual results.
// These also have getters so they can be accessed like arrays.
// The second [0] returns the SpeechRecognitionAlternative at position 0.
// We then return the transcript property of the SpeechRecognitionAlternative object
const color = event.results[0][0].transcript;
diagnostic.textContent = `Result received: ${color}.`;
bg.style.backgroundColor = color;
console.log(`Confidence: ${event.results[0][0].confidence}`);
};
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}
## See also
- [Web Speech API](/en-US/docs/Web/API/Web_Speech_API)