This website is not affiliated with or endorsed by Blizzard Entertainment. It has been created by the HearthGround team (a spanish fansite). If you need to contact us, please do so through our Twitter account.
Our score system uses a complex algorithm that considers the total upvotes and downvotes made by users to decide how correct a matchup is. The generated score is based on a scale of 1 to 100, meaning that a score lower than 50 is probably not correct, or hasn't been voted enough.
In the end, the final decision of who counters a hero is up to every player and his/her experience in the game. If you agree or disagree with some of the matchups you find, we encourage you to upvote/downvote them to get a more precise and realistic counter list for other users.
A patch can totally change a hero overnight. If a matchup is made obsolete by a patch, it won't instantly get a bad score because of the number of votes it already had. When such situation arises, players will eventually downvote that matchup and upvote better options, lowering the score of the obsolete matchup and adapting the ranking to the game state.
To have a better understanding of what matchups are trending, you can filter them to show only the votes submitted since the last patch release.
Matchup scores are recalculated every few minutes to avoid overloading our web server. Don't worry though, your votes are taken into consideration! ;)
At this moment we don't offer any kind of API for accessing our data, nor do we provide the data for use on other websites or mobile applications.