Learn the universe from the atom up.
Physics, chemistry, maths, time and space. Every idea comes with an animation you can play with, a quick 5-mark check, and a path that remembers where you are.
Five subjects. One path each.
Every subject is a path of modules, and every module is five levels and an exam you have to pass to move on.
- PhysicsHow things move, fall, shine and spark, all the way to quantum physics and relativity.8 modules
- ChemistryWhat everything is made of and how it changes, all the way to quantum chemistry.8 modules
- MathematicsNew modulesFrom counting to calculus, proof, number theory, linear algebra and the unsolved frontiers: everything a mathematician learns.25 modules
- TimeClocks, calendars, deep time and relativity: everything about time.20 modules
- SpaceThe night sky, the Solar System, stars, galaxies and the whole universe.20 modules
Trigonometry and calculus
Five new modules take the maths path from right-angled triangles to the derivative and the integral. Each one is five levels and a module exam, with lessons opening level by level.
- Module 8Trigonometry I
- Angles, degrees and radians
- Sine, cosine and tangent
- Standard angles
- Heights and distances
- Solving right-angled triangles
- Module 9Trigonometry II
- The unit circle
- Graphs of sin, cos and tan
- Trigonometric identities
- Compound and double angles
- Sine and cosine rules
- Module 10Calculus I: limits and change
- Rates of change
- The gradient of a curve
- Limits
- Continuity
- Differentiation from first principles
- Module 11Calculus II: differentiation
- The power rule
- Product and quotient rules
- The chain rule
- Tangents and normals
- Maxima, minima and optimisation
- Module 12Calculus III: integration
- Area under a curve
- Antiderivatives
- Definite integrals
- Calculus in motion
- Infinity and unsolved problems
- Module 13Series and infinity
- Sigma notation
- Arithmetic and geometric series
- Infinite series and convergence
- Chasing π
- e and Euler's identity
- Module 14Taming big equations
- Expanding and factorising
- Algebraic fractions
- Polynomials and the remainder theorem
- The binomial theorem
- Partial fractions
- Module 15Proof and logic
- Logic and truth
- Direct proof and counterexamples
- Proof by contradiction
- Mathematical induction
- Sets, relations and functions
- Module 16Number theory
- Divisibility and Euclid's algorithm
- Modular arithmetic
- Fermat's and Euler's theorems
- Diophantine equations
- Cryptography and RSA
- Module 17Complex numbers
- Imaginary numbers
- The complex plane
- Polar form and De Moivre's theorem
- Roots of unity
- The fundamental theorem of algebra
- Module 18Linear algebra
- Vectors in three dimensions
- Matrices
- Determinants
- Solving systems with matrices
- Eigenvalues and eigenvectors
- Module 19Counting and networks
- Counting principles
- Permutations and combinations
- Pigeonhole and inclusion–exclusion
- Graphs and Euler's bridges
- Networks, trees and colouring
- Module 20Probability and statistics II
- Conditional probability and Bayes
- Random variables and expectation
- Binomial and Poisson distributions
- The normal distribution
- Hypothesis testing
- Module 21Calculus IV: techniques and series
- Derivatives of eˣ, ln x and trig
- Integration by substitution
- Integration by parts
- Taylor series
- L'Hôpital's rule and improper integrals
- Module 22Differential equations
- What is a differential equation?
- Separable equations
- Linear first-order equations
- Second-order equations and oscillation
- Modelling the world
- Module 23Multivariable calculus
- Functions of two variables
- Partial derivatives
- Gradient and optimisation
- Double integrals
- Vector fields, div and curl
- Module 24Analysis and abstract algebra
- The real numbers
- Limits made rigorous
- Countable and uncountable infinity
- Groups and symmetry
- Rings, fields and Galois
- Module 25Frontiers of mathematics
- Geometry beyond Euclid
- Topology
- Chaos and fractals
- Gödel, Turing and the limits of maths
- The great unsolved problems
Drag the angle. Sine is the height, cosine is the width.
Slide along y = x². The slope of the touching line is the derivative, 2x.
Every lesson is something you can play with.
No sign-up needed for this bit. Pick a demo and poke it.
Open this lessonLet the skater roll and watch energy swap between the bars.
Total: 1588 J. With no friction, the total never changes. Kinetic and potential energy just swap back and forth.
The fact machine
Pull the lever for a random fact, with the reason it is true. The full machine also turns your birthday into facts about your life and takes any number apart.
Pick a topic, or leave it on All, and pull the lever.
Every fact comes with the reason it is true. The machine won't repeat a fact until it has used every one in that topic. There are 43 to find.
Labs you can break
Free-play tools where you build, launch and test things yourself.
- Can you solve it?Ten very hard problems for every subject, with hints and worked solutions.
- What if…?What if Earth stopped spinning? Wild questions, real science, step by step.
- ParadoxesTime travel, infinite hotels and Schrödinger's cat, each as a story and an animation.
- Rocket labDesign a multi-stage rocket, then fly it to the Moon.
- Circuit labWire cells, bulbs and switches with a live Ohm's law solver.
- Chemistry benchMix acids, metals and indicators, safely.
- Optics benchBend light with lenses, mirrors and prisms.
- Molecule labJoin any of the 118 elements and name what you make.
- How it worksCars, F1 cars and race circuits, part by part.
How Atomica works
- 1Watch it moveEvery idea starts as an animation, in plain words first and the deep version when you want it.
- 2Check yourselfEach lesson has a 5-mark quick check, and each level ends in a 20-question test. Score 14 to pass.
- 3Pass the moduleFive levels make a module. Pass its exam to unlock the next one. No skipping ahead.
- 4Keep the streakSet a daily goal and keep your day streak going. A little every day beats a lot once a month.
Collect the periodic table
Every module hides one mystery element, picked at random just for you. Pass the module exam to reveal it. No two modules share the same one, so your collection is yours alone.
Explore all 118 elementsQuestions
Is Atomica free?
Yes. You can start any subject, use the labs and the fact machine without paying, and you don't need an account to begin.
Which classes is it for?
It is written for students aged roughly 11 to 16, and the later modules go well beyond school, into relativity, quantum physics and calculus.
Do I need to know calculus before the calculus modules?
No. The maths path builds up to it through algebra, graphs, functions and trigonometry, and the first calculus level starts with plain speed and slope.
Does it follow CBSE or ICSE?
The topics cover what both boards teach, but the order follows how ideas build on each other rather than one textbook.
Can I start in the middle?
Yes. Take the placement quiz and Atomica starts you at your first gap instead of Level 1.
Start with one atom.
Pick a subject or two, start from the basics or take the placement quiz, and Atomica remembers where you are.