Been using this for a while and thought I’d share it with the community.
It lets you test your site on multiple devices side by side. Views are synced so as you scroll one, they all scroll. So no more inspect and switching device sizes.
It has a bunch of different devices and the ability to throttle connection to test different network speeds.
There are also things like live CSS editor and touch emulation.
All this for the low low price of free.