Collection
Galvanic cells, reaction mechanisms, equilibrium, acids and bases, kinetics and molecular structure to try out.
Apps
Drag p orbitals together into the π cloud, compare bond lengths with a caliper and pull up the hydrogenation steps: why the double bonds in benzene do not jump and where the resonance energy of about 150 kJ/mol comes from. With Hückel’s rule and exam questions.
ChemistryTry it
Drag drops straight into the beaker: acetic acid/acetate, ammonium/ammonia, phosphate or bicarbonate in blood catch H₃O⁺ and OH⁻ particle by particle until the reserve is used up. Comparison beaker with pure water, buffer curve, buffer range pKa ± 1, capacity bar, exact calculation and exam tasks.
ChemistryTry it
The Daniell cell and any other pairing of Zn, Cu, Ag, Pb, Fe and Mg: electrons run in the wire only, ions through the salt bridge. Close the circuit, lift out the bridge, change the concentration and calculate with the Nernst equation, then run the cell in time-lapse to ΔE = 0. With the electrochemical series, a lens on the electrode and prediction tasks on the negative pole.
ChemistryTry it
Drag the electron arrows yourself: from the electron pair to the electron-poor atom. A correct move plays the step in 3D, a wrong one gets a reason. Bromine and ethene, bromination of benzene, chlorination of methane, SN1 and SN2, with energy profile, SE/SN/SR comparison and a test mode for the Abitur.
ChemistryTry it
Disturb the dynamic NO₂/N₂O₄ equilibrium by changing concentration, pressure or temperature. Watch forward and reverse reactions establish a new balance.
ChemistryTry it
Add base to an acid and watch the pH curve and indicator. Compare four acid/base strength combinations and their different equivalence-point pH values.
ChemistryTry it
A hands-on energy hill: a ball must first get over the activation energy before it rolls down and releases energy – exothermic and endothermic, with oxyhydrogen, hydrogen peroxide, sugar and copper sulfate. A catalyst lowers a pass into the hill while ΔH stays the same; in check mode you spot the mistakes in typical student drawings.
ChemistryTry it
A box full of gas particles next to their energy distribution, counted live from exactly these particles: those with at least the activation energy glow, and effective collisions flash. Drag the thermometer, add a catalyst and compare: heat widens the curve, the catalyst only lowers the threshold.
ChemistryTry it
Follow adsorption, bond breaking, water formation and desorption on platinum. Switch the surface off to compare collisions without catalytic activity.
ChemistryTry it
Rotate eight molecules and inspect bonding angles and lone pairs. See how electron-pair repulsion shapes molecules from linear to octahedral arrangements.
ChemistryTry it
A million position measurements drawn from |ψ|² build the orbital dot by dot: s spherical, p dumbbell, d four-lobed. A cross-section reveals the nodal surfaces, the radial distribution compares measurement and theory, and the Bohr orbit sits inside as a thin ring.
ChemistryTry it
L-alanine and its mirror image as rotatable ball-and-stick models: superimposed, H and CH₃ remain swapped, while glycine with two H matches. A binding pocket with three sites holds L-alanine at three sites and D-alanine at only two. Plus R- and S-carvone (spearmint and caraway).
ChemistryTry it
Explore all 118 elements. Switch colour maps between element classes, atomic radius, electronegativity and ionisation energy; inspect shells, configurations and properties.
ChemistryTry itCollections
See through Latin sentences and understand participles, in real passages from Seneca and Ovid.
5 appsOpen collection
Photoelectric effect, potential well, double slit, atomic model, fields, induction and oscillations to try out.
16 appsOpen collection
Gene regulation, PCR, protein biosynthesis, cell division, evolution, metabolism and ecology to try out.
18 appsOpen collection
Planning and steering projects: the iron triangle, stakeholders, network diagrams, earned value, schedule risk, team size, Kanban and waterfall against Scrum.
8 appsOpen collection
From sequences to loans: arithmetic and geometric growth, savings plans, annuities, compounding within the year and perpetuities.
11 appsOpen collection
Reading the traces: burial mounds in section, radiocarbon dating, settlements in the landscape and the tomb of Tutankhamun.
5 appsOpen collection
Why robot arms are heavy, how six axes guide a hand and how control holds the load.
4 appsOpen collection
Tables, keys, joins, groups and subqueries you can touch: how a database really reads.
7 appsOpen collection
Generative AI in strong images: what it can do, how it writes, why it convinces, how to use it well and where to take care.
7 appsOpen collection
Engine, brakes, high voltage, CAN bus and chassis: technology and diagnostics of the modern vehicle.
9 appsOpen collection
Heat in the city centre: heat islands, shade, trees and unsealing, using the old town of Reutlingen as an example.
5 appsOpen collection
Reading the small print, spotting subscription traps, placing risk figures and making texts understandable.
4 appsOpen collection
From equation to curve: initial values, linear equations, substitution and the worlds in which they apply.
7 appsOpen collection
Mean, median, mode, box plot and levels of measurement: descriptive statistics to try out.
9 appsOpen collection
From coordinates to the inverse: vectors, dot and cross products, linear equations and matrices in pictures.
12 appsOpen collection
Production principles, waste, one-piece flow, value streams, bills of materials and routing: how a factory is organised.
9 appsOpen collection
What the CRA requires of manufacturers: checking whether it applies, meeting reporting deadlines, keeping software bills of materials.
5 appsOpen collection
Reducing, common denominators, multiplying, dividing and mixed numbers: fractions step by step.
7 appsOpen collection
Proofs of special beauty to touch: Zagier's windmills, the museum guards and Buffon's needle.
3 appsOpen collection
How oscillations break down: coefficients, symmetry, phasor chains, the Gibbs phenomenon and the plucked string.
7 appsOpen collection
What happens inside the machine: objects, methods, operators, slicing and sorting in Python, visible step by step.
9 appsOpen collection
From the Patent Motor Car to the Z3: famous machines and experiments cut open in 3D.
11 appsOpen collection
Keyboard, intervals, scales, chords, the circle of fifths and groove: music theory you hear and play.
9 appsOpen collection
How sound is made and shaped: synthesizers and samplers, envelopes and overtones, waveforms and timbre, voice and orchestra, room acoustics and sound scenography — all audible in your browser.
16 appsOpen collection
Staging space, sight, light, sound and paths: visitor flows, showcase lighting, room acoustics, sound islands, projection mapping and the pavilions of world expos to try out.
15 appsOpen collection
Mathematical questions open for decades, for which an AI model proposed solutions in 2026, as interactive apps: understand the problem, experience the result.
32 appsOpen collection
From neurons and gradients to transformers, RLHF and agents: machine learning you can touch.
44 appsOpen collection
DNA, replication, transcription, translation and cell division as explorable 3D models.
26 appsOpen collection
Perspective, ornament, structure and space: how art and architecture work with mathematics.
21 appsOpen collection
Hyperloop, autonomous vehicles, warehouses and conveyors: logistics as interactive simulation.
17 appsOpen collection
Heart, eye, voice, skeleton and nerves: the human body in 3D, layer by layer.
10 appsOpen collection
Monty Hall, Simpson, Berkson and base rates: where intuition fails us with numbers.
14 appsOpen collection
Planets, stars, black holes and space probes: the cosmos to explore.
10 appsOpen collection
Light switches for nerve cells, a telescope made of ice, mirror-image chemistry and interest rates: the 2026 Nobel Prizes to try out.
8 appsOpen collection
Planted participants, smoke in the room, one dollar for a lie and experimenters who are themselves the subjects: famous social psychology experiments to try yourself.
5 appsOpen collection
Relations, classes, orders, bijections, different infinities and topology: mathematics as the science of structure, hands-on.
11 appsOpen collection
Riemann, P vs NP, Poincaré and other great questions of mathematics, made tangible.
16 appsOpen collection
Counting, arithmetic and shapes: maths for beginners, playful and clear.
6 appsOpen collectionWant to use these apps in your courses? Let’s find out what works for you.
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