diff --git a/README.md b/README.md
index c793d72ca..3a73f8fd5 100644
--- a/README.md
+++ b/README.md
@@ -46,6 +46,7 @@ for the up-to-date list of maintained branches of Shaka Player.
 |Tizen TV³     | -        | -       | -       | -       | -        | -         | -          | -      |**Y**|
 |WebOS⁶        | -        | -       | -       | -       | -        | -         | -          | -      |**Y**|
 |Hisense⁷      | -        | -       | -       | -       | -        | -         | -          | -      |**Y**|
+|Vizio⁷        | -        | -       | -       | -       | -        | -         | -          | -      |**Y**|
 |Xbox One      | -        | -       | -       | -       | -        | -         | -          | -      |**Y**|
 |Playstation 4⁷| -        | -       | -       | -       | -        | -         | -          | -      |**Y**|
 |Playstation 5⁷| -        | -       | -       | -       | -        | -         | -          | -      |**Y**|
@@ -239,6 +240,7 @@ MSS features **not** supported:
 |Tizen TV      |**Y**     |**Y**    | -       | -       |**Y**     |
 |WebOS⁷        |untested⁷ |untested⁷| -       | -       |untested⁷ |
 |Hisense⁷      |untested⁷ |untested⁷| -       | -       |untested⁷ |
+|Vizio⁷        |untested⁷ |untested⁷| -       | -       |untested⁷ |
 |Xbox One      | -        |**Y**    | -       | -       | -        |
 |Playstation 4⁷| -        |untested⁷| -       | -       |untested⁷ |
 |Playstation 5⁷| -        |untested⁷| -       | -       |untested⁷ |
diff --git a/externs/shaka/player.js b/externs/shaka/player.js
index 6cf4ea137..f964a1f1b 100644
--- a/externs/shaka/player.js
+++ b/externs/shaka/player.js
@@ -2061,20 +2061,20 @@ shaka.extern.MediaSourceConfiguration;
  *   IMA on platforms that do not support multiple video elements.
  *   <br>
  *   Defaults to <code>false</code> except on Tizen, WebOS, Chromecast,
- *   Hisense, PlayStation 4, PlayStation5, Xbox whose default value is
+ *   Hisense, PlayStation 4, PlayStation5, Xbox, Vizio whose default value is
  *   <code>true</code>.
  * @property {boolean} skipPlayDetection
  *   If this is true, we will load Client Side ads without waiting for a play
  *   event.
  *   <br>
  *   Defaults to <code>false</code> except on Tizen, WebOS, Chromecast,
- *   Hisense, PlayStation 4, PlayStation5, Xbox whose default value is
+ *   Hisense, PlayStation 4, PlayStation5, Xbox, Vizio whose default value is
  *   <code>true</code>.
  * @property {boolean} supportsMultipleMediaElements
  *   If this is true, the browser supports multiple media elements.
  *   <br>
  *   Defaults to <code>true</code> except on Tizen, WebOS, Chromecast,
- *   Hisense, PlayStation 4, PlayStation5, Xbox whose default value is
+ *   Hisense, PlayStation 4, PlayStation5, Xbox, Vizio whose default value is
  *   <code>false</code>.
  * @property {boolean} disableHLSInterstitial
  *   If this is true, we ignore HLS interstitial events.
diff --git a/lib/util/platform.js b/lib/util/platform.js
index 8ab81a3c8..ce1a9cac5 100644
--- a/lib/util/platform.js
+++ b/lib/util/platform.js
@@ -222,7 +222,8 @@ shaka.util.Platform = class {
    * @return {boolean}
    */
   static isChromecast() {
-    return shaka.util.Platform.userAgentContains_('CrKey');
+    const Platform = shaka.util.Platform;
+    return Platform.userAgentContains_('CrKey') && !Platform.isVizio();
   }
 
   /**
@@ -337,6 +338,14 @@ shaka.util.Platform = class {
         shaka.util.Platform.userAgentContains_('VIDAA');
   }
 
+  /**
+   * Check if the current platform is Vizio TV.
+   * @return {boolean}
+   */
+  static isVizio() {
+    return shaka.util.Platform.userAgentContains_('VIZIO SmartCast');
+  }
+
   /**
    * Check if the current platform is Orange.
    * @return {boolean}
@@ -539,7 +548,8 @@ shaka.util.Platform = class {
     if (Platform.isTizen() || Platform.isWebOS() ||
         Platform.isXboxOne() || Platform.isPS4() ||
         Platform.isPS5() || Platform.isChromecast() ||
-        Platform.isHisense() || Platform.isWebkitSTB()) {
+        Platform.isHisense() || Platform.isVizio() ||
+        Platform.isWebkitSTB()) {
       return true;
     }
     return false;
diff --git a/project-words.txt b/project-words.txt
index d1c71a4bf..401f4e7e3 100644
--- a/project-words.txt
+++ b/project-words.txt
@@ -194,6 +194,8 @@ Tizen
 Uplynk
 Verimatrix
 Vidaa
+Vizio
+VIZIO
 Vnova
 Widevine
 wiseplay
diff --git a/test/util/platform_unit.js b/test/util/platform_unit.js
index 6061b3aee..5fb681cd1 100644
--- a/test/util/platform_unit.js
+++ b/test/util/platform_unit.js
@@ -27,6 +27,9 @@ describe('Platform', () => {
   const webOs4 = 'Mozilla/5.0 (Web0S; Linux/SmartTV) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.34 Safari/537.36 WebAppManager';
   const webOs5 = 'Mozilla/5.0 (Web0S; Linux/SmartTV) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36 WebAppManager';
   const webOs6 = 'Mozilla/5.0 (Web0S; Linux/SmartTV) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.79 Safari/537.36 WebAppManager';
+
+  // cspell: disable-next-line
+  const vizio = 'Mozilla/5.0 (X11; Linux aarch64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.141 Safari/537.36 CrKey/1.0.999999 VIZIO SmartCast(Conjure/MTKF-5.1.516.1 FW/0.6.11.1-2 Model/V50C6-J09)';
   /* eslint-enable max-len */
 
   afterEach(() => {
@@ -210,6 +213,12 @@ describe('Platform', () => {
     });
   });
 
+  it('checks is Vizio', () => {
+    setUserAgent(vizio);
+    expect(shaka.util.Platform.isVizio()).toBe(true);
+    expect(shaka.util.Platform.isChromecast()).toBe(false);
+  });
+
   describe('isMediaKeysPolyfilled', () => {
     let shakaMediaKeysPolyfill;