HOTSAnalyst Companion
Rate players without leaving the game
The Companion is a small free Windows app that sits over Heroes of the Storm. Rate your teammates while you play and your replays upload on their own afterwards.
Free, one-click install, no admin rights needed. All versions
Rate as you play
A panel over Heroes of the Storm lists your teammates, and the enemy team too. Tap a thumb and a few tags and you're done.
Replays upload themselves
When a game ends your replay is sent to your account and matched with your votes. No more drag and drop.
See your lobby early
Your teammates appear as soon as the game loads, and the enemy team's heroes fill in about a minute later.

After installing, open the Companion's settings and click Connect to your account: it opens this site, you approve with Battle.net, and it sets up your BattleTag and token for you. Without that the Companion still shows your lobby, but your votes and replays aren't saved to the site and you won't see ratings. The setup guide shows exactly how.