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Correction: Netflix for Android/iOS, YouTube for Android/iOS, Google Play for Android, and Chrome browser for Android/Windows/Mac/iOS/ChromeOS.

iOS support is a major factor here.

> There are 4 applications that know what a Chromecast is and can send video to it: Netflix for Android, YouTube for Android, Google Play for Android, and Chrome for Android/Windows/Mac.

Clearly, ChromeOS does too, since it works on the Chromebook Pixel.

Well, there are 4 now. But there's a public API (more precisely, 3 public APIs), so more'll start popping up soon enough.

https://developers.google.com/cast/