Collection
Photoelectric effect, potential well, double slit, atomic model, fields, induction and oscillations to try out.
Apps
Pick an oil droplet in the microscope, adjust the voltage until it hovers and save the measurement. The histogram grows block by block and multiples of e appear. With the balancing method, the rise and fall method, worked solutions and exam tasks.
School physicsTry it
Four devices, two forces: fine beam tube, Wien filter, mass spectrometer and cyclotron as glowing field rooms in 3D. Set U, E, B and the particle, and follow the force and velocity arrows live. The curve |v| shows it: the electric field changes the speed, the magnetic field only the direction. With predictions and exam-style tasks.
School physicsTry it
The Franck–Hertz experiment in 3D: drag the voltage, the curve draws live and the current drops at equal intervals. Measure the minima, calculate energy and wavelength, with mercury or neon and its glowing layers.
School physicsTry it
The photoelectric effect in a 3D lab: filter Hg lines, set the intensity at a grey wedge, drag the retarding voltage. Intensity changes only the current, frequency changes the stopping voltage. With the Hallwachs experiment, the retarding-field method, h from the line and the wave model for comparison.
School physicsTry it
A standing matter wave in a glass trough: drag the walls and watch the energy ladder E_n = n²h²/(8mL²) spread live. 1000 position measurements build up |ψ|², and a classical ball shows the difference. Transitions with photon and wavelength, electron versus proton, a prediction question and exam-style calculations.
School physicsTry it
Compare particles, waves and individual quantum detections. Adjust slit spacing and wavelength, then enable a which-path detector to remove interference.
PhysicsTry it
Single quanta arrive as dots on the screen, and thousands of hits grow into the fringe pattern. The detector slider raises which-path information continuously — the fringes fade into two humps without anything changing at the source.
PhysicsTry it
The electron jumps between quantized orbits (Eₙ = −13,6 eV·Z²/n²); on a downward jump a photon is emitted and the corresponding spectral line lights up in the emission spectrum (Lyman/Balmer/Paschen). Hydrogen or He⁺.
Physics experiments (Deutsches Museum)Try it
A current-carrying conductor with its ring-shaped B-field (right-hand rule) in 3D and a moving charge on a circular path due to the Lorentz force F = q·v×B — vectors v, B, F in colour, sliders for I, B and v.
Electrical engineering fundamentalsTry it
A magnet is moved through a coil: induced voltage U_ind = −N·dΦ/dt live as a plot, Lenz's rule in colour; in the second mode a rotating loop acts as a generator producing a sine voltage.
Electrical engineering fundamentalsTry it
A parallel-plate capacitor with visible charge build-up plus an RC circuit: charge/discharge curve U_C(t) = U(1−e^(−t/RC)) and I(t) animated live, time constant τ = RC marked; sliders for R, C and U.
Electrical engineering fundamentalsTry it
RLC series resonant circuit: frequency response |Z|(ω) and current I(ω) with resonance at ω₀ = 1/√(LC); resonance curve with quality factor Q and bandwidth, a draggable frequency marker shows Z, I and φ at the point.
Electrical engineering fundamentalsTry it
Spring-mass oscillator: harmonic motion x(t)=A·cos(ωt) with ω=√(k/m), period T=2π·√(m/k); an energy bar shows the conversion kinetic ↔ potential (sum constant).
Engineering mechanicsTry it
Move a sound source and compare compressed and stretched wavefronts. Explore observed frequency, audible pitch changes and the Mach cone beyond sound speed.
School physicsTry it
Two almost equal tones: the loudness pulses Δf times per second, not Δf/2. Phasors, the envelope with a bracket T = 1/Δf, the spectrum with the auditory filter and a perception axis show when the pulsing tone turns rough and, beyond the critical bandwidth, into two separate tones. Eight acoustic examples (tuning a guitar, accordion musette, minor second, low and high third, fifth …), all audible.
School physicsTry it
An atom grid decays in sync with the curve N(t)=N₀·(½)^(t/T). Half-life T constant: at T/2T/3T still 50/25/12,5% remain. Switchable to growth with doubling time.
School mathematics (Gymnasium)Try itCollections
See through Latin sentences and understand participles, in real passages from Seneca and Ovid.
5 appsOpen collection
Galvanic cells, reaction mechanisms, equilibrium, acids and bases, kinetics and molecular structure to try out.
13 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.
One form, three matters. We answer personally.
We show heyprof on your own material. Tell us what you teach and we will prepare the conversation around it.