Tweetbot 2 fully embraces the Yosemite aesthetic that was introduced in OS X last year while still maintaining much of the same functionality and layout with which users are already familiar. Everything has been flattened, and timelines that previously sported a light gray tone are now pure white.
The dark gray color on the sidebar has been swapped out in favor a dark translucent look, while the sidebar buttons for each section have been replaced with simpler glyphs. A circular blue indicator on the right side of the icon now indicates new activity in place of the vertical bar that previously appeared on the left side (a change which, if you can believe it, actually hampered my workflow for a while). The iconography throughout the app is now more in-line with its iOS counterpart.
It’s the best Twitter client on any computer.