YouTube’s HTML5-compatible web app is getting a makeover. The new design includes a much darker color palette, according to news first published by Macstories.

First released in July 2010, the YouTube web app is available on the iPhone/iPod touch through Mobile Safari. The latest refresh presents videos against dark toolbars and buttons.

To active the new design on your iPhone, you must first visit http://m.youtube.com/new_visual_design. Next select “Try the New Visual Design!” From there, the application will reload and begin using the new design.

Adding dark colors definitely makes the YouTube web app a little bit better on the eyes. Plus, it looks sleeker. As we indicated last year, the YouTube web interface is quicker and cleaner than the native app, plus it has some added functionality. Our earlier advice still holds: Ditch the native app and begin using YouTube via Mobile Safari.