Haipai
Study Your Mahjong Mistakes
Upload your Mortal AI analysis, see every mistake categorized, and learn until the leaks are gone.
Auto-Categorized Mistakes
Upload your Mortal analysis and every mistake gets classified — tile efficiency, defense, push/fold, riichi timing, and more. No manual sorting.
Track Your Improvement
See trends over time — EV loss per game, severity breakdown, and skill area progression. Know exactly where you're getting better.
Drill It — No Account Needed
Three arcade trainers you can play right now: read waits before the hand hits the floor, remember which tiles are safe against a riichi, and fly a plane that shoots tiles into a hand until it's tenpai. Play now — make an account when you want your score on the leaderboard.
Per-game breakdown
Trends
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