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FOUR OF HEARTS INTERACTIVE

Games with heart.Apps with purpose.

Fun, useful, privacy-minded software from an independent South Dakota studio that loves the craft.

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A red dragon and rider flying over the vast fantasy world of GildenSpire GildenSpireDragon Flight Adventure In Development Thumb Command Blueguard interceptor defending a city from an alien fleet Thumb CommandArcade Defense In Development Bobby defending a colorful landscape with bread-powered towers Bobby the BreadasaurusTower Defense Adventure In Development Evil Doom Boy and Evil Doom Girl, the two selectable heroes in the Evil Doom Boy action-adventure gameChoose Your Hero Evil Doom BoyAction Adventure In Development BooYang City artwork with a cheerful character overlooking a zoo, bakery, waterfront, and colorful city BooYang CityCity Adventure In Development Funky Town artwork with a bold mural-covered neighborhood and vivid hand-painted street art Funky TownCreative City Builder In Development HeartStack Unicorn Blast puzzle gameplay and unicorn rescue HeartStackPuzzle Adventure In Development Princess Land heroine and castle world Princess LandCreative Simulation In Development Unicorn Land character and magical habitat Unicorn LandCreative Simulation In Development Palace castle and card-game emblem PalaceCard Game Founder Review Hearts ruby card-game artwork HeartsCard Game Internal Alpha Spades purple card-game artwork SpadesCard Game Internal Alpha Euchre green card-game artwork EuchreCard Game Internal Alpha Solitaire cards arranged over ruby and midnight blue with gold trim SolitaireCard Game In Development Two high playing cards meet across a bright blue and crimson divide WarCard Game In Development Looking for useful apps? Meet Whomly and Sleep Amigo. ↗

NEW FROM FOUR OF HEARTS INTERACTIVE

GildenSpire

FLIGHT OR FIGHT

Raise a dragon. Explore an enormous world. Fight for the sky.

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A red dragon and rider flying above the enormous fantasy world of GildenSpire while a rival dragon approaches

THE NAME

4. Ohhh. I get it.

Four of Hearts. Somebody said it out loud. The name stuck.

That is the whole story: Four of Hearts became 4OH. We began at the card table and kept building—original games, strange little worlds, and useful apps made independently in South Dakota.

No secret acronym. No corporate mythology. Just Four of Hearts said out loud.

The unnecessarily complete explanation ↗

THE CRAFT

Old-school values.
Modern ambitions.

Careful engineering. Thoughtful design. Testing on physical devices. Accessible defaults. Privacy considered before the first line ships.

Independent companies should still be allowed to make wonderfully strange things.

PRIVACY IS PART OF THE PRODUCT

Personal information should remain personal.

We love data. We just do not think all of yours belongs to us. Four of Hearts makes paid software, not dossiers: no behavioral advertising, no cross-app profiling, and as little collection as the product actually needs.

We do not need to know what kind of toilet paper you buy. We are sure it is fine.

Read our privacy approach →
  • No behavioral ads
  • No sale of personal data
  • Local-first where practical

THE CURRENT 4OH LINEUP

Fun games. Great apps.

One studio. Two useful instincts: make play worth your time, and make tools that earn their place on your device.

ORIGINAL GAMES

Fun is serious work around here.

A red dragon and rider flying over the vast fantasy world of GildenSpire Flight · Combat · AdventureGildenSpireRaise your dragon. Take to the skies. Fight for an enormous fantasy world.Discover GildenSpire ↗ Thumb Command Blueguard interceptor defending a city from an alien fleet Arcade · DefenseThumb CommandAlien fleets. Real cities. One very busy spaceship.Enter Thumb Command ↗ Bobby defending a colorful landscape with bread-powered towers Tower Defense · AdventureBobby the BreadasaurusA bread dinosaur, a herd to protect, and a suspicious number of defensive towers.See Bobby’s defenses ↗ Evil Doom Boy and Evil Doom Girl, the two selectable heroes in the Evil Doom Boy action-adventure gameChoose Your Hero Action · AdventureEvil Doom BoyChoose who stands up to Evil Doom.Meet both heroes ↗

PUZZLE & CREATIVE PLAY

Strategy, silliness, and a lot of heart.

BooYang City artwork with a cheerful character overlooking a zoo, bakery, waterfront, and colorful city City Building · Mini AdventuresBooYang CityA whole city of things to do.Explore BooYang City ↗ Funky Town artwork with a bold mural-covered neighborhood and vivid hand-painted street art Building · Art · CommunityFunky TownBuild a town. Turn it into art. Make it yours.Enter Funky Town ↗ HeartStack Unicorn Blast puzzle gameplay and unicorn rescue Puzzle · AdventureHeartStack Unicorn BlastMatch suits. Set off ridiculous chain reactions. Free the unicorns.See HeartStack ↗ Princess Land heroine and castle world Creative SimulationPrincess Land AdventuresDesign the castle, style the princesses, cook, decorate, then rearrange all of it.Visit Princess Land ↗ Unicorn Land character and magical habitat Creative SimulationUnicorn Land AdventuresMeet the unicorn. Fix the mane. Shape the habitat. Add way too many flowers.Meet the unicorns ↗

CLASSIC CARD GAMES

Deal us in.

Palace castle and card-game emblem Card gamePalaceThe table game of resets, burns, transparent eights, and generations of house rules.Play Palace ↗ Hearts ruby card-game artwork Card gameHeartsAvoid the points. Unless you’re taking every last one.Learn Hearts ↗ Spades purple card-game artwork Card gameSpadesBid it. Make it. Try not to blame your partner.Read the table ↗ Euchre green card-game artwork Card gameEuchreFive cards. Two bowers. At least twelve regional arguments about the rules.Call trump ↗ Solitaire cards arranged over ruby and midnight blue with gold trim Card gameSolitaireA clean, satisfying solo card table built for one more deal.Deal Solitaire ↗ Two high playing cards meet across a bright blue and crimson divide Card gameWarFlip, clash, and settle the deck with simple rules and dramatic moments.Flip a card ↗

APPS WITH PURPOSE

Useful software.
Less nonsense.

We like software that actually does something: thoughtful tools, clear decisions, and privacy built into the plan.

Whomly magnifying-glass identity in cyan and violet on deep navy Public Research · PeopleWhomlyFind people. Open opportunities.Discover Whomly ↗ Sleep Amigo celestial character resting beneath a crescent moon and stars Sleep · WellnessSleep AmigoBetter nights. Better you.Meet Sleep Amigo ↗
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LATEST FROM 4OH

Notes from the workbench.

Introducing GildenSpire: Flight or FightRaise a dragon, take direct control in the sky, and discover what happens when flying becomes fighting.Read dispatch ↗Why Flying Has to Be FunThe journey should be gameplay: direct flight, enormous terrain, curiosity, and combat that rewards control.Read dispatch ↗Building Dragons That Actually Feel DifferentGildenSpire dragons are being designed as different creatures—not one model wearing different colors.Read dispatch ↗

Site settings

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Language and table-name choices are not stored. The complete Palace browser game stores its progress and sound/motion choices only on this device. A privacy-choice cookie is used only if you ask us to remember that optional cookies must stay off.

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Read the California Privacy Policy and Notice at Collection