Pocket Cosmos: Gravity Sandbox

A universe in your pocket. Tap anywhere and a planet is born, tracing its orbit under real N-body gravity — a simple toy you can watch forever.

WHO IT'S FOR
- You enjoy watching physics and space simulations
- You want something calm to play with during short breaks
- You'd like to show kids what gravity actually does
- You love sharing beautiful screenshots

HOW TO PLAY
- TAP to spawn a planet — it automatically orbits the dominant body
- DRAG to slingshot a new body. The predicted path is shown before you release, so you can aim for a perfect orbit
- LONG-PRESS to create a black hole that devours everything nearby
- PINCH & PAN to zoom around your universe

5 SCENARIOS
- Solar System: planets and a comet around a central star
- Binary Stars: two suns waltzing around their barycenter
- Galaxy Collision: two clusters spiral into each other
- Chaos: a random N-body playground
- Empty Space: build your own system from nothing

DETAILS & FEATURES
- Star color follows mass (light = orange, heavy = blue-white). Merge bodies to grow a star
- Collision particles, flashes, sound effects and haptics
- Time warp from 0.25x to 4x, plus pause
- One-tap screenshot sharing
- Available in 8 languages

PRIVATE BY DESIGN
- No ads, no in-app purchases
- No data collection, no account
- Works fully offline — even in airplane mode

On the train, in bed, between classes — bend gravity with a fingertip.