Cairn

Cairn is a Hearthstone deck tracker that runs natively on Linux.

No Electron, no Overwolf, no second Wine prefix: Cairn reads the log files the game writes on its own and displays what it finds there. It never touches the game's memory and never injects anything. Around 170 MB of memory, against 1.5 to 4 GB for a Windows tracker running under Wine next to the game.

On Plasma it ships its own KWin rules. The overlay layer rule is what lets the panels draw on top of an exclusive-fullscreen game, which is otherwise not possible under Wayland, and per-widget rules in Remember mode let you place each panel where you want it.

What it shows: cards left in your deck and draw odds, what enters the deck mid-game, top and bottom of deck, the opponent's hand with where each card came from, secret candidates, resurrection pools, contextual counters, game and turn timers, potential damage on both sides, and win rates per deck and per opponent archetype.

No account, no telemetry, no server. Everything stays in ~/.local/share/cairn. MIT licensed.