Independent mobile game studio

Small games.
Big fun.

We build polished, pick-up-and-play mobile games and apps for iOS and Android — from cozy aquariums and X-ray security shifts to glowing block puzzles and brain training.

Bubble Reef Scanbusters FillGlow Number Memory What Day Is It
5Games & apps live
iOS + AndroidApp Store & Google Play
0Sign-ups required to play
100%Designed & built in-house
Our games

Five worlds, one goal: instant fun

Every title starts with one simple idea, then gets polished until it feels just right. Pick one to dive in.

Bubble Reef icon

Bubble Reef: Aquarium Game

IdleSimulationCollectionAndroid

Your reef is waiting — and it's alive.

A relaxing aquarium game where a living, breathing underwater world grows around you. Fish glide in lazy schools, the water shimmers and the lights dim when night falls on your device. Check in for five minutes or settle in for the evening — there's always something beautiful waiting when you return.

  • 🐠
    50 species, 5 rarity tiersFrom Common to Legendary — fill your fish encyclopedia one stunning discovery at a time.
  • 💧
    Real aquarium careWatch water quality and oxygen, spot disease and treat it in time. Happy fish show it.
  • 🌙
    Idle progress & real day–night cycleAuto-feeder, cleaning snail and sweeper robot keep the reef thriving while you're away.
  • 🪸
    Freeform decorationPlace plants, rocks and ornaments anywhere — no grid, no locked slots.
Bubble Reef trailer
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Scanbusters icon

Scanbusters: X-Ray Security

ArcadeHidden ObjectOfflineAndroid

Nothing gets past you. Scan, spot, seize.

Step into the security booth. Bags roll through the X-ray scanner one by one — tap the suspicious ones, start a timed hand search and find every forbidden item hidden inside. Miss one and you lose a life. You only have three.

  • 📋
    Today's RuleEvery shift opens with a 10-second briefing of what's forbidden. Memorize it — the belt is about to move.
  • 🏟️
    Every venue, its own rulesMall, Stadium, Prison, Exam Hall and more — an item allowed in one place may be banned in the next.
  • ⚡
    Rush HourWithout warning the conveyor speeds up. Only the quickest guard keeps the line moving.
  • 🎨
    Collect & customizeComplete venue catalogs, earn stars and coins, and style your scanner with stickers and X-ray themes.
Scanbusters trailer
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FillGlow icon

FillGlow: Block Puzzle

PuzzleBoardOfflineiOS

One glowing square. Fill it exactly. Watch it grow.

Every level gives you a single lit target on a 9×9 board. Drag blocks from your tray, tap to rotate and snap them in until the square is exactly full. Clear it and it grows — 3×3, 4×4, all the way to 7×7. The twist: nothing disappears on its own, so every placement matters.

  • ✨
    Chase the Perfect ClearFinish with nothing outside the square. Chain GOOD!, GREAT!, PERFECT! and watch the multiplier climb.
  • 🎁
    Daily spin & banked boostersHammer, Magnet, Sweep and Shuffle — and your charges never expire at midnight.
  • 🌌
    Seven colour worldsFrom Purple Galaxy to Deep Ocean, with glossy candy-gel pieces.
  • ♿
    Calm & accessibleNo timer, no lives, no energy meter. Fully offline with full VoiceOver support.
Number Memory icon

Number Memory – Brain Age Test

Brain TrainingPuzzleiOSAndroid

Can you remember 10 numbers in 5 seconds?

Numbers flash on screen in random positions. Memorize them, then tap them back in order — purely from memory. Every correct round adds one more number. One wrong tap ends the run and reveals your Brain Age, calculated from the level you reached, your accuracy and your speed.

  • 🧠
    Brain Age scoreEight performance labels from Try Again to Legendary. Beginners reach level 4–5 — how far can you go?
  • ⚡
    Reaction Time modeFive rounds, millisecond precision. Your personal best is saved automatically.
  • 📊
    Track your progressBest level, best Brain Age, streak counter and a chart of your recent games.
  • 🔒
    Private by designNo account, no server. All data stays on your device and it works fully offline.
Number Memory promo video
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What Day Is It icon

What Day Is It: National Day

LifestyleReferenceiOS

Open the app — today's answer is already on screen.

No menu, no account, no setup. Every day of the year has its own color and pattern, with the day's name, hashtag and a one-line story. Read it in thirty seconds, share it, get on with your morning — and add your own special days so the app celebrates them with you.

  • 🎨
    366 days, 366 designsNo stock photos. The app looks different every single morning.
  • 🎂
    Your own daysBirthdays, anniversaries, the day you met — when the date arrives, the screen becomes yours.
  • 🔔
    A gentle 10 AM reminderPlus search, calendar jumps and swipe-through browsing of every day.
  • 📲
    Made to sharePost the screen exactly as it is to Instagram, WhatsApp or your story. Your data stays in your iCloud.
What Day Is It video
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About us

A small studio that sweats the details

ICOS Dev is an independent mobile studio. We design, build, art-direct and ship every title ourselves — from the first prototype to the store page and the trailer.

Our games share a simple philosophy: respect the player's time. No confusing menus, no forced sign-ups, no pressure — just a clear idea, executed with care, that you can enjoy for thirty seconds or three hours.

🎯 One idea, done wellEach game is built around a single, satisfying core mechanic.
🔒 Privacy firstPlay without accounts. Most of our games work fully offline and keep data on your device.
🎨 Crafted visualsHand-picked colors, playful characters and smooth animations in every title.

Let's talk

Questions about our games, feedback, press or partnership ideas? We read every message.