Card counting,
at table speed.
Play a real six-deck shoe with the count hidden. After every round, Stack21 reveals what the count was, scores your running and true counts, checks your play against the chart, and checks your bet against the ramp. The drill counters spend years building on their own.
- Hi-Lo
- 6-deck shoe
- S17, DAS, late surrender
- 0.43% house edge
A real table, with the count graded after every hand.
Three steps from sitting down to seeing the score. The same loop counters drill on their own, scaled to whatever pace you can keep.
Pick a table, set a buy-in.
Six Vegas rule sets are wired in. Sit down at the one that matches the spread you actually play. Bankroll persists across sessions so the table feels like your own.
Cards deal at casino speed.
The shoe runs in real time with the count hidden. You handle the bet, the play decisions, and the side calls. No prompts, no training wheels.
The reveal scores every call.
After the hand, the count is shown, your running and true counts get scored, your play is checked against the chart, and your bet is checked against the ramp.
Counting practice.
Play, then prove the count.
Every round, Stack21 hides the count, hands you the cards, and lets you play. When the hand resolves, the reveal scores your running count, your true count, your bet sizing, your adherence to basic strategy, and any Illustrious 18 or Fab 4 deviations the hand qualified for.
Sharpen the fundamentals.
Pure-keyboard drills you can run between hands or before a session. Same value tables, same chart enforcement as the main trainer.
H, S, D, P, R on the keyboard. Chart adherence tracked per session.
Tag cards plus one, zero, or minus one as fast as they deal.
What $2.99 a month unlocks.
Free covers the whole counting loop. Pro raises the bankroll, opens session history, and turns on the alternative count systems as they ship.
Founder pricing while we are early. The monthly rate stays at $2.99 for as long as you keep the subscription.
Full pricingCommon questions, plain answers.
No. The free account gets the full counting trainer, the strategy drill, and the Hi-Lo tagging drill, with a $1,000 monthly chip refill. Pro is $2.99 a month if you want session history and a $10,000 refill.
Stack21 runs a live Hi-Lo count behind the table. After each round the trainer reveals what the running count and true count were, compares them to what you typed in, and tracks the running accuracy across the session. Bet sizing is graded against a 1-2-4-6-8 Hi-Lo ramp on the same true count.
A six-deck shoe, dealer stands on soft 17, double after split allowed, late surrender allowed, 3 to 2 on naturals. The same rule set as a mid-Strip mid-limit table in 2026. Other rule sets ship in the lobby and live at /tools/vegas-blackjack-tables.
Card counting is a positive-expectation strategy only under specific rule, penetration, and spread conditions. Stack21 makes you faster and more accurate. Whether that turns into money at a real pit depends on the rules you find, the heat you can tolerate, and the bankroll you bring. No app changes that math.
Yes in every US jurisdiction we know of. Casinos are private businesses though, so they can still refuse service. Knowing the rules of the venue you walk into is on you.
Hi-Lo only today. Alternative count systems are on the Pro roadmap. If you want a specific system prioritised, the contact link in the footer goes straight to the inbox.
The shoe is waiting.
Six decks. Cards down, count up. Reveal after the chips clear. No card on file, no daily caps, no soft-mode coaching.