Deck trackers track history
They show your deck list, cards drawn, cards remaining, secrets played, and replay data. This helps planning, but it may not highlight an immediate KO route.
Tool comparison
Deck tracker vs lethal helper
A deck tracker answers what has happened. A lethal helper answers whether the current visible position may already be winning. Both can be useful, but they solve different problems.
Lethal helpers scan the turn
A fair lethal helper should focus on visible damage, legal actions, blockers, and sequencing. It should teach the line instead of playing the game for you.
Replay tools explain mistakes
Replay review is strongest after the game. You can compare the route you took with the route that had lethal, then convert the mistake into a short drill.
Calculators are training wheels
Manual calculators are slower than overlays, but they build the habit that matters: count first, then sequence, then commit.
The product gap
Many tools track information. Fewer tools train lethal recognition. LethalCue is positioned around fair-play lethal awareness, puzzles, and missed-lethal review.