With every-10-minutes price data on commonly-traded items in not only Jita, but Dodixie, Amarr, Hek and Rens gathered fresh from ESI market API. Prices will refresh as new data comes in, no need to hit your browser’s reload button.
Or, just run a price check on almost any item in EVE in those hubs.
It cannot yet get prices from Upwell structures. I’d like to add this in the future though.
Update: It appears to be picking up the price of PLEX at Jita 4-4 properly, minus a bit of lag. It is not picking up all the offshored orders in Senda and Perimeter because those are beyond it’s scope at present.