Learning apps

Mini apps for curious minds

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Mini games12 games
Simulations34 simulations
Tools7 tools

Featured

Hand-picked by the Astra team

GeneralTool4.434.4K

Smart Encyclopædia

Explorable infographics. Click anything to generate the next one.

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BiologySimulation4.328.7K

Human Body Atlas

Pick an organ off the body map, turn it in your hands, and name every structure.

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PhysicsSimulation4.419.7K

Solar System

Explore the planets, the Moon's phases, and eclipses in one 3D model.

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Today's puzzles

New puzzles every day. Solve them to place on the leaderboard.

Guess the Equation

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Nonogram

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Sudoku 6×6

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Logic Gates

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Marbleslides

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Minesweeper

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15 Puzzle

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Hashi

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Pipes

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Scribble Launch

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All time, across Astra

1Guess the Equation68.5K
2Build a Cell38K
3Smart Encyclopædia34.4K
4Tower of Hanoi29.9K
5Human Body Atlas28.7K
6Pipes24K
7Minesweeper22.2K
8Cell 3D22.2K
9Build an Atom21.6K
10Sudoku 6×621.6K

Fresh this month

Physics
8K

Scribble Launch

Sketch ramps, seesaws and ropes, and roll the pod into its rocket.

Math
4.47 ratings16.8K

Hashi

Connect every island into one network without crossing any bridges.

Loved by students

Biology
4.6(129)129 ratings

Cell 3D

Explore generated plant and animal cell models in 3D.

Chemistry
4.6(64)64 ratings

3D Molecules

Drag to rotate, toggle lone pairs, and read the geometry and bond angle.

Biology
4.4(644)644 ratings

Build a Cell

Build cells with the right organelles.

Physics
4.6(38)38 ratings

Double Pendulum

Watch chaos emerge from two coupled pendulums.

Chemistry
4.5(71)71 ratings

Virtual Lab

Drop metals into water and watch reactions unfold.

Chemistry
4.5(145)145 ratings

Build an Atom

Build isotopes and ions from subatomic particles.

Math
4.8(21)21 ratings

Unit Converter

Convert units across length, mass, time, and more.

Physics
4.4(180)180 ratings

Optics Puzzle

Drag the mirrors so the laser reflects off them and reaches the glowing target.

Chemistry
4.6(44)44 ratings

pH Mixer

Drip acid or base and watch the pH shift.

Physics
4.4(102)102 ratings

Solar System

Explore the planets, the Moon's phases, and eclipses in one 3D model.