As per the Hearthstone Tournament Player Handbook v2.3 (from the official Hearthstone Website's eSports Rules and Policies), section 5.10 "Written Notes and Deck Tracking Software", Blizzard generally acknowledges and permits deck trackers for tournament usage, as long as the specific tournament does not prohibit trackers and the tracker itself complies with the terms outlined in the player handbook.

We believe that the Hearthstone Deck Tracker - as the most prominent and widely-used deck tracker for Hearthstone - fully complies with these rules. We believe that our deck tracker enhances competitive play by allowing players to review their matches after the game and replacing the task of manually creating notes for each match.

If you're unsure about your specific tournament, we recommend reaching out to your tournament organizers.

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