DeckLab is a small lab of 23+ browser-based calculators for Magic: The Gathering, Yu-Gi-Oh!, Pokémon TCG, poker, bridge and other card games. Every tool runs entirely in your browser — no accounts, no uploads, no tracking pixels.
Most "calculator" pages online copy a single formula, slap a logo on it, and call it a tool. We try to do the opposite: each tool here solves a real decision a player actually has to make, with the small refinements that experienced players quietly care about.
Every tool answers a question players actually ask: "is this opening hand keepable?", "should I call this all-in?", "is my mana curve safe for turn 4?" — not just "what is 14 × 2?"
We don't hide trade-offs. The hypergeometric lab warns when sample sizes make the math misleading. The equity calculator tells you when ranges are too wide to act on. Honesty beats hype.
No popups, no fake "download" buttons, no "share with friends" walls, no pre-checked marketing checkboxes. If we ever run ads, they sit in normal editorial slots — never in disguise.
Tap a card to open the tool. Each page also has its own usage notes, FAQ and disclaimers.
Visualize your curve with a quality score that flags "too top-heavy" or "all 2-drops" decks.
Compute the smallest legal deck that hits your target win-rate vs. an expected field.
Mulligan with London/Paris rules, see color-source probability and a real "keep / mulligan" verdict.
Count W/U/B/R/G pips and on-color sources; warns when you depend on off-color splash.
4-player tracker with per-commander damage, poison, emblems — and one-tap undo.
Hypergeometric draw with "minimum copies in opening 5" and a starter/handtrap ratio.
Counts Main/Extra/Side, copies-per-card limit, TCG/OCG flag, with a "needs human review" warning.
Level-rank grid: which monsters can summon which, plus Tuner/Synchro/Xyz viability.
Auto-classify your deck as Aggro/Stadium/Control based on Pokémon-types and counts.
Plots per-attack energy cost distribution and matches it to your energy count.
Compute EV of "boss KO vs. item KO" given bench HP and your prize count.
Monte-Carlo vs. a hand or a range, with "pot odds" overlay and a fold/call suggestion.
Pl Omaha vs. up to 4 ranges, with "nut advantage" indicator (draws to nuts vs. draws to second-best).
Decision trainer with EV difference; flags deviations from basic strategy.
Banker/Player/Tie EV, commission and streak analysis — honest about the house edge.
HCP + distribution + suit-quality, with a "balanced? 4-4-4-1?" self-check for notrump bidding.
Reads your tableau and suggests the move with highest expected progress — no auto-play.
Bag-risk-aware bid suggestion, with blind-nil and partnership-mode flags.
Detects sets & runs in your hand and shows which card to discard for fastest win.
General "draw N from population K with M successes" calculator with sample-size warnings.
Fisher-Yates with crypto.getRandomValues, shareable seed for replays.
nCr / nPr with "Texas Hold'em hole-card combos" preset (C(52,2)=1,326 explained).
Draw a fair hand from 1-10 decks, with optional filters by suit/rank.
Players who already know the basic rules and want to make better decisions: which hand to keep, whether to call a bet, whether their Commander deck has a real mana base, whether to fire a Tribute Summon on turn 4. Not a beginner tutorial site.
It is not a deck-builder, card database, or collection manager. We don't store your decks anywhere. We also don't sell cards or run affiliate marketplaces.
The site is funded by a few clearly-labelled, non-personalised display ads in editorial positions. Your calculations are never sent to any server; see the privacy policy for details.