ScreenCastify actually plays the video on your media player which results in a much higher quality picture than apps that mirror your screen.
Best Casting App! Cast any online video to your TV.

ScreenCastify ™ works with Chromecast® + Roku® + Fire TV® + Apple TV® (4th Gen) , as well as smart TVs powered by Roku, Fire TV or Chromecast.
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*** Feature Highlights ***

• HD resolution supported (1080p and up to 4K depending on the device)
• Advanced browser, supports multiple browser tabs, blocks or hides spammy popups, search from the URL bar, ad blocker, browsing history etc...
• Subtitle auto-detect + Movie/TV Subtitle library
• Live streams support
• Video preview: up to 72 snapshots to instantly locate your favorite scenes.
• Binge-ready: queue up several videos, and enjoy.
• Set your own home page, bookmark web page or videos.
• Full playback controls, from the app or from the lock screen after exiting the app.
• Privacy modes: anonymous & private