Manual input only. This page never reads the Dota client, its files, memory or screen, so it is the same as checking stats on your phone. Score = the hero's position win rate plus its matchup edge against every enemy and synergy with every ally (Stratz, current patch, high brackets). It is a ranking aid, not a win probability. Item win rates favour late items because longer games are often wins, so compare items bought at similar minutes. Data from STRATZ and Valve.