Less guesswork.
Better next moves.
Deck and shop calculators, a grade-versus-sell comparison, an achievement notebook and a technical-report builder. Everything stays in your browser, with the assumptions right beside the answer.
Deck planner
Count your 50 cards, check copy limits, track missing cards and keep a local backup.
Open toolOpening-hand odds
Compare opening-hand chances and one mulligan. See how target-copy counts affect consistency.
Open toolProfit calculator
Turn cost and markup into price, gross margin, operating profit and a break-even estimate.
Open toolBefore you pay for grading.
Use the grade-versus-sell comparison to find the sale amount needed to recover the ungraded value and your full service costs. Your amounts, no assumed grade odds, no game-save access.
A better bug report.
Use the local technical-report builder for platform-specific checks, optional FPS comparisons and a copyable draft. No hardware scan, game-file upload or automatic ticket.
Your next five goals.
Record the five new 1.0 achievements in the achievement notebook. Keep counts and session notes locally, and export a backup without a Steam login.
Local-first, by design.
Your deck worksheet stays in this browser. Download a JSON backup to keep a copy or move it to another device. No Steam login, game-save upload or account required.
Not a black box.
Count checks do not establish full deck legality. Draw math is not a win prediction. A profit estimate is not a guarantee that customers will buy. Each tool tells you exactly what it does.