Web Audio API

- WD

High-level JavaScript API for processing and synthesizing audio

IE

  1. 5.5 - 10
  2. 11

Edge

  1. 12 - 81
  2. 83

Firefox

  1. 2 - 24
  2. 25 - 77
  3. 78
  4. 79 - 80

Chrome

  1. 4 - 9
  2. 10 - 33
  3. 34 - 81
  4. 83
  5. 84 - 86

Safari

  1. 3.1 - 5.1
  2. 6 - 13
  3. 13.1
  4. 14 - TP

Opera

  1. 9 - 12.1
  2. 15 - 21
  3. 22 - 68
  4. 69

iOS Safari

  1. 3.2 - 5.1
  2. 6 - 13.3
  3. 13.4
  4. 14.0

Opera Mini

  1. all

Android Browser

  1. 2.1 - 4.4.4
  2. 81

Blackberry Browser

  1. 7
  2. 10

Opera Mobile

  1. 10 - 12.1
  2. 46

Chrome for Android

  1. 81

Firefox for Android

  1. 68

IE Mobile

  1. 10
  2. 11

UC Browser for Android

  1. 12.12

Samsung Internet

  1. 4 - 11.2
  2. 12.0

QQ Browser

  1. 10.4

Baidu Browser

  1. 7.12

KaiOS Browser

  1. 2.5

Not all browsers with support for the Audio API also support media streams (e.g. microphone input). See the getUserMedia/Streams API data for support for that feature.

Firefox versions < 25 support an alternative, deprecated audio API.

Chrome support went through some changes as of version 36.

Resources:
Additional browser compatibility tests for specific features
MDN Web Docs - Web Audio API
Polyfill to support Web Audio API in Firefox
Polyfill to enable Web Audio API through Firefox Audio Data api or flash
WebPlatform Docs