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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 Boy and Girl, the playable siblings in the Evil Doom Boy tower-defense gameChoose Your Hero Evil Doom BoyTower Defense 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 Original concept art of a two-player Gin Rummy table overlooking a lake Gin RummyCard Game 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 SOVINTO, 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, imaginative 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 have room to build inventive products that make life more useful and play more joyful.

AI helps us explore ideas, build, and test. We also use it within products where it serves a clear purpose. Human judgment and careful engineering guide the work.

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 ↗ Boy and Girl, the playable siblings in the Evil Doom Boy tower-defense gameChoose Your Hero Tower Defense · ActionEvil Doom BoyThey lost their names. Not their courage.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 ↗

THE CARD TABLE

Good games.
Better company.

Partnerships, bold bids, friendly rivalry, and a quiet solo deal. Find your kind of table.

Palace: Actual Samsung app screenshot; system bars cropped
2–4 players

Palace

One table. Three layers. A hidden finish.

Discover & play Palace ↗
Hearts: Actual Hearts web render from unchanged mobile-app source; local bot table
4 players

Hearts

Read the room. Dodge the points.

Explore Hearts ↗
Spades: Actual app web render from September 12 audit; local bot bidding
4 players · 2 teams

Spades

Make the bid. Back your partner.

Explore Spades ↗
Euchre: Actual app web render from September 12 audit; local bot calling
4 players · 2 teams

Euchre

Five cards. Two bowers. One good call.

Explore Euchre ↗
Solitaire: Artwork used in the Solitaire app; not a gameplay screenshot
1 player

Solitaire

A little quiet. One satisfying deal.

Explore Solitaire ↗
War: Artwork used in the War app; not a gameplay screenshot
2–4 local players

War

Flip together. Let the cards decide.

Explore War ↗
Gin Rummy: Original AI-generated Gin Rummy concept artwork; not a gameplay screenshot
2 players

Gin Rummy

Two players. Ten cards. One good read.

Explore Gin Rummy ↗

A welcoming table is the idea.

We want joining to be simple and the competition worth coming back to. Today, Palace has tested online joining in its private app, War brings people together on one device, and the other multiplayer titles are still being developed. Public community features and lasting online rankings are not available across the collection.

APPS WITH PURPOSE

Useful software.
Less nonsense.

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

SOVINTO champagne and silver S emblem on charcoal Preparation · Practice · NegotiationSOVINTOPrepare with purpose. Negotiate with confidence.Meet SOVINTO ↗ 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.

BooYang City: a town that grows with playAnimal friends, pastry inventions, go-karts, and new places to explore are taking shape in the development build.Read dispatch ↗GildenSpire: a dragon built to moveAn original animated dragon, richer terrain, and a completed native campaign check move the world forward.Read dispatch ↗Small fixes that change the feelBattle speed, sleep refreshes, saved progress, and creative tools received focused attention in the latest audit.Read dispatch ↗

Site settings

Make the site comfortable.

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.

Privacy control center

Your privacy choices

Read the California Privacy Policy and Notice at Collection