Daily Deal
One deck for everyone, every day. One ranked try, a streak to keep, and a spoiler-free result grid to share.
New deck daily
The 2012 classic, rebuilt from scratch
StackJackFive hands of 21.
StackJackFive hands of 21.
One clock.
Cards arrive one at a time. Tap a column to play each one and build five stacks as close to 21 as you can without going over. Clear the target, then Stand — every second left on the clock multiplies your score.
Coming soon to iPhone, iPad and MacGet launch news from Lost Island
Launch news comes from the Lost Island Entertainment mailing list on lostisland.com. This site itself collects no personal information.
- Free to play
- No energy, no waiting
- iPhone · iPad · Mac
- English · Español · Português
How to play
Easy to learn. Hard to put down.
Play every card
The next card is always waiting. Tap any of the five columns to place it. Aces count as 1 or 11; face cards count as 10.
Stay at 21 or under
Go over and that stack busts and scores nothing. Stack totals are hidden — keep count in your head, or pick a Gadget that shows them.
Clear the target, then Stand
Reach the round's target total and Stand. The faster you finish, the bigger your time multiplier. Passes let you skip a card you can't use.
Bonus hands: a Natural 21, a Five-Card Charlie and a perfect round all score extra. Rounds get quicker as you go.
Modes
Six ways to play
A quick round on the bus, a ranked daily duel with the world, or a long Run with a pocket full of Gadgets.
Weekly Challenge
Two twists every week — No Passes, Short Clock, Gadget Kit and more. Same for everyone; play as often as you like and post your best.
New twists weekly
Run
Eight rounds, a boss round every fourth, and a new Gadget to pick after each round. Bosses like High Bar and Short Fuse change the rules.
Eight rounds
Endless
One bottomless shoe and no clock. Every 21 clears its stack and pays out the perk under that column. One bust ends it.
No clock
Classic and Zen
The original mode with a shrinking clock, or Zen with no clock at all. The original 2013 rules are one switch away in Settings.
Since 2012
Duels and challenges
Play a friend on the same Wi-Fi with identical decks and live progress, or send a challenge code anyone can play.
Play togetherRun mode
Gadgets: retro-futurist tricks that stack
After each round of a Run, pick one of three Gadgets. They last for the rest of the game and combine in surprising ways. Everyone playing the same seed is offered the same three, so challenges stay fair.
X-Ray GogglesSee the next card in the deck. Each extra pair shows one more.
Adding MachineShows each stack's total.
Crystal BallShows what the current card would make on each stack.
Hold SlotA parking spot: swap the current card in and out of it.
Bust ShieldOnce per round, a card that would bust a stack bounces off instead.
Time DilatorOnce per round, tap to freeze the clock for 5 seconds.
RewinderOnce per round, take back the card you just placed.
ReshufflerOnce per Run, shuffle the rest of the deck.
OverdriveThe first stack to hit 21 each round scores double.
Card CounterShows how many ten-value cards are left in the deck.
Extra Pass+1 pass every round.
Lucky SevensA stack of 7-7-7 scores +21.
MagnetOn the leftmost stack, every 2–5 is worth +1.
Plus Hot Streak and Atomic Ace — fifteen Gadgets in all.
Fair by design
Skill and speed. Nothing else.
StackJack has always been about how well and how fast you play. The rebuild keeps it that way.
- No energy, no lives, no waiting to play.
- Nothing you can buy makes you stronger. Purchases remove ads and add looks.
- After every round, see the best total that deck allowed — so you know how close you came.
- Every Daily Deal is checked before it goes out, so the deck is always beatable.
- Challenge codes and Duels deal identical decks and identical Gadget offers.
- No betting, no chips, no prizes, no real money. Ever.
iPhone · iPad · Mac
Made for every screen
Big, readable cards on iPhone in landscape, a roomy table on iPad, and full keyboard play on Mac. Buy StackJack Plus once and it works on all three.
Screenshots
Take a closer look
Since 2012
Back from the archive
StackJack first shipped on the App Store in 2012. Version 2.0 is a ground-up rebuild for today's iPhone, iPad and Mac — with the old rules still inside: switch on Original 2013 Classic in Settings for the giant multipliers you remember.
Bought the original paid StackJack? StackJack Plus is already yours on the same Apple Account.
Free to play
Play free. Upgrade once, if you like.
Every mode and every Gadget is free. StackJack Plus is a one-time purchase — no subscription.
StackJack
Free
The whole game.
- Every mode: Daily, Weekly, Run, Endless, Classic, Zen
- Duels and challenge codes
- Game Center leaderboards and 20 achievements
- Any ads appear only between games — never during a round
- Optional ads for bonuses, only when you choose
StackJack Plus
$4.99 one time
No more ads between games. Forever.
- No ads between games
- You can still choose to watch ads for bonuses
- 3 free bonuses a day — no ad needed
- Play any past Daily Deal
- Exclusive Plus card back and table
Plus Collector's
$9.99 one time
For superfans and supporters.
- Everything in Plus
- Wavy Navy card back
- Rocket City Diner table
- Supporter badge
US prices shown; the App Store shows the price in your currency. Purchases are made through Apple, work on iPhone, iPad and Mac with the same Apple Account, can be restored at any time, and support Family Sharing. Atoms, the in-game currency, are earned by playing and can't be bought.
Play your way
Built for everyone at the table
StackJack follows the accessibility settings you already use.
- VoiceOver reads cards, stacks, totals and the deck.
- Larger Text (Dynamic Type) on every menu screen.
- Reduce Motion turns card flights, confetti and shakes into gentle fades.
- Full keyboard play on iPad and Mac: 1–5, P, S, H, F, Z and Esc.
- Haptics on iPhone and Force Touch trackpads.
- English, Spanish and Brazilian Portuguese.
FAQ
Questions, answered
When is StackJack coming out?
Very soon. StackJack 2.0 is finishing its final checks for the App Store. Join the Lost Island list to hear the moment it's out.
Is it free?
Yes. Every mode and every Gadget is free to play. StackJack Plus ($4.99, one time) removes ads between games and adds extras. There's no subscription.
Is this gambling?
No. StackJack is a skill-and-speed puzzle game about making 21. There's no betting, no chips, no prizes and no real money anywhere in the game, and nothing you buy gives you an advantage.
Which devices does it run on?
iPhone and iPad with iOS 18 or iPadOS 18 or later, and Mac with macOS 15 or later. Buy StackJack Plus once and it's unlocked on all of them with the same Apple Account.
Do I need an account?
No. Your progress stays on your device. Signing in to Game Center is optional and only needed for leaderboards and achievements.
Does it work offline?
Yes. Everything except Game Center and the optional statistics works offline. Duels need both players on the same Wi-Fi network.
I bought StackJack years ago. Do I get anything?
Yes — StackJack Plus is unlocked automatically on the same Apple Account that bought the original paid StackJack.
Who is StackJack for?
StackJack is designed for players aged 13 and up. It has no chat, and Duels only work between nearby players on the same Wi-Fi. Parents can read our page for families.
What data do you collect?
Very little, and nothing that identifies you unless you choose to. Read the privacy policy for the details, in plain language.
Android or Windows?
Not yet. If you'd play it, tell us at support@stackjack.app — demand decides what comes next.
Deal me in.
Five hands of 21, one clock, and a whole retro-future to play in.
Coming soon to iPhone, iPad and MacGet launch news from Lost Island
Launch news comes from the Lost Island Entertainment mailing list on lostisland.com. This site itself collects no personal information.