Blackjack Theory app icon Blackjack Theory Coming soon on iPhone
Basic strategy · Card counting

Play blackjack like the math says.

Drill every decision until it's automatic, learn Hi-Lo card counting one step at a time, and watch a skill rating climb as you get it right.

Coming soon to the App Store See what's inside
  • ~0.5%house edge with perfect basic strategy
  • Hi-Locounting course with index plays
  • 1000starting rating, updated every 10 hands
Inside the app

Everything between you and a perfect game.

Basic strategy

Learn every play, and the reason behind it.

Real hands dealt from a six-deck shoe, one to three seats at a time. Every answer comes with a plain-English explanation, so you understand the chart instead of memorising it.

  • Feedback on every hand, only on mistakes, or none at all
  • A colour-coded chart for the exact rules you're playing
  • Hit, stand, double, split and late surrender
The strategy chart in Blackjack Theory
Card counting

Count cards, from your first lesson to game speed.

Five short lessons take you from card values to betting with the true count. Then timed drills deal the cards faster and faster, and show exactly where you slipped.

  • Card value, running count and true count drills
  • Beginner to advanced speeds
  • Pro tables quiz you at random and make you read the discard tray
A running count drill with a card-by-card breakdown
Index plays

Know when the count says break the rules.

Practise the Illustrious 18 and the Fab 4: the hands where a high or low true count changes the right play, adjusted for the table's rules.

  • Hands dealt near each index, so about half of them cross it
  • Every answer shows the index and why it applies
  • A full reference list for your table
An index play drill at a true count of +4
Your progress

A rating that only climbs when you're right.

An Elo-style skill rating starts at 1000 and updates every ten hands. Tough spots you get right count for more, and easy ones you miss cost more. A 20-hand Skill Test recalibrates it honestly.

  • Rating, accuracy and hands graphed over time
  • Day streaks with optional reminders
  • Accuracy by hard totals, soft totals and pairs
The Stats tab with a rating graph
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Full practice table

1,000 chips, bets from 1 to 500, coaching as you play.

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Casino or online

A real shoe with a cut card, or a reshuffle after every hand.

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Three difficulties

Learning shows the count; Practice and Pro make you keep it.

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Up to three seats

Play several hands at once, each with its own decisions.

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Skill Test

20 hands, no hints, no feedback. The honest measure.

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No account needed

Your progress stays on your phone. No ads, no tracking.

Pricing

Start free. Go Pro when you're hooked.

Free

$0

  • Strategy chart for every rule set
  • 20 drill hands a day
  • Counting lessons 1–2 and the card values drill
  • Rating, day streak and reminders
7-day free trial

Pro

$39.99/year

or $7.99/month

  • Unlimited drills, up to three seats
  • Play mode with chips and coaching
  • The full counting course and index plays
  • Practice and Pro tables
  • Skill Test and full rating history

Lifetime

$99.99once

  • Everything in Pro
  • Pay once, keep it forever
  • No subscription to manage

Prices in US dollars; your App Store shows your local price. Subscriptions renew automatically until cancelled in your App Store settings.

Free guides

Learn the theory.

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Blackjack basic strategy chart

The full 6-deck chart for hard totals, soft hands and pairs, plus the rules of thumb and the mistakes most players make.

Read the guide → ♥

How to count cards

The Hi-Lo system step by step: card values, running count, true count and betting with the count, with worked examples.

Read the guide → ♦

Illustrious 18 and Fab 4

The index plays where the true count tells you to break basic strategy, with H17 and S17 values.

Read the guide →
FAQ

Good questions.

Is this real-money gambling?

No. Blackjack Theory is a training app. All chips are practice chips with no cash value, and there's no way to buy or cash out chips.

Is card counting legal?

Yes. Counting is just paying attention, and it's legal. Casinos are private businesses, though, and can refuse to deal to players they think are counting.

Does counting work at online casinos?

Usually not. Most online tables reshuffle after every hand, so there's no count to keep. The app's Online mode shows you exactly that.

Which rules does the app use?

Six decks, dealer hits soft 17, double on any two cards and after splitting, blackjack pays 3 to 2, and late surrender, which you can switch off. The strategy chart and index plays adjust to match.

Do I need an account?

No. There's no sign-up. Your progress is stored on your phone, and Restore Purchases brings Pro back on a new device.

How do I cancel Pro?

Open Settings on your iPhone, tap your name, then Subscriptions. Cancel at least 24 hours before your trial or billing period ends, and you won't be charged again.

Need a hand?

Questions, bug reports or billing help: we read every message.

support@blackjacktheory.app

Restore Pro on a new phone: open Settings in the app (the gear, top right) and tap Restore purchases.

Manage or cancel: iPhone Settings → your name → Subscriptions.