DENRAKU vs Origami Learn

DENRAKU is an interactive educational app that visualizes the invisible world of electromagnetism in real time. Touch and move fields, currents and waves to connect the equations with what you see. Developer: Fuji Bit Inc. DENRAKU is the electromagnetism edition of the "-raku" physics simulation series. It turns the electromagnetism of school and university physics into moving pictures, not just formulas. 12 simulations in 3 categories: - Electricity and current - Electric Field: Place positive (+) charges with a tap or negative (-) charges with a long press. Field lines and a strength map follow Coulomb's law, with particles flowing along the lines. Drag charges to reshape the field. - Capacitor: Watch an RC circuit charge and discharge. Synced graphs of Q(t), I(t) and V(t) show what the time constant tau means. - Circuit: Explore Ohm's law (V = IR) with a series circuit. Adjust voltage and resistance with sliders and watch current particles speed up or slow down. - Ion Conduction: See cations and anions drift in opposite directions inside an electrolyte. Adjust voltage, ion density, mobility and temperature to explore drift velocity (vd = mu E) and conductivity (sigma = nq mu). - Magnetism and induction - Magnetic Field: Place bar magnets and observe dipole field lines (B proportional to 1/r^3) from the N pole to the S pole, with a field strength heatmap and cyan particles. Drag to move magnets, long press to remove them. - Field of a current (new): See the field lines and compass needles around a straight wire, a circular loop and a solenoid, shown in cross-section. Drag the probe to read the magnetic flux density B in microtesla at any point. The loop and solenoid are computed from the exact 3D field of circular currents, so you can check the right-hand rule. - Hall Effect: Apply a magnetic field to a current-carrying conductor and watch the Lorentz force deflect carriers, producing the Hall voltage Vh = IB/(nqt). Switch between electrons and holes to see the accumulation side reverse. - Electromagnetic Induction: Drag a magnet toward and away from a coil. A real-time meter and graph show Faraday's law (EMF = -N dPhi/dt) and Lenz's law in action. - AC and electromagnetic waves - Generator: See how a coil rotating in a magnetic field generates a sinusoidal EMF, epsilon = NBA omega sin(omega t). Tune the field, turns, angular frequency and load to study the peak EMF and output power. - Transformer: Simulate mutual induction between primary and secondary coils on an iron core. Adjust voltage, frequency, turns ratio and load to see V2/V1 = N2/N1 and I2/I1 = N1/N2 in real-time waveforms. - RLC AC circuit (new): Apply an AC voltage to a series circuit of a resistor R, an inductor L and a capacitor C. Charges moving back and forth in the circuit, voltage and current waveforms, a phasor diagram and the resonance curve are shown together. Sweep the frequency to see the phase shift and resonance, or tune to the resonant frequency f0 with one tap. - Electromagnetic Wave: Watch electric (red) and magnetic (blue) fields oscillate perpendicular to each other as they propagate. Adjust wavelength, amplitude and frequency; learn Maxwell's equations and c = lambda f. Features: - Clean, modern design (dark and light themes) - Home screen organized by category - Tips and a play button in the control panel - Intuitive touch controls (tap, long press, drag) and parameter sliders - An explanation sheet with formulas for every simulation - In landscape, the canvas and control panel are shown side by side - Supports larger text sizes - 73 languages including English and Japanese, following your device language - No sign-in: start exploring right away Price: - Free - In-app purchases: none - Subscriptions: none - Ads: a banner ad by Pangle at the bottom of the screen The "-raku" educational app series: - SUUGAKU - Mathematics - BUTURAKU - Mechanics - DENRAKU - Electromagnetism - HARAKU - Waves

Origami Learn is a folding simulator, not a picture book. Every one of the 959 steps in this app is real geometry. The paper on screen is a simulated sheet with layers and creases, so you can drag a fold half-way and hold it there, turn the sheet over to see which flap moves, and replay the same crease as many times as you like. Nothing here is a photograph or a video. That is why it can unstick you when a diagram in a book cannot. 148 MODELS, 122 FREE FOREVER 116 origami models, 9 modular pieces built from folded units, and 23 kirigami designs you fold and cut. Cranes, boxes, flowers, animals, insects, stars, snowflakes, and the traditional children's furniture set. Each one is a genuine traditional design, with the region it came from and the paper it wants. A COURSE, NOT A CATALOGUE Nine chapters take you from "what is a valley fold" to bird bases, reverse folds, modular units and open-and-pull. Twelve lessons and seven practice sets, each unlocking the models that use what you just learned. Search the whole path, switch to a chapter grid, or ask for just the next thing in each chapter. LEARN TO READ ORIGAMI BOOKS Beside the live paper, every step is also drawn the way an origami book draws it: the standard symbols, dashed valley and dash-dot mountain creases, and fold arrows anchored to the corner that actually travels. Learn these and the rest of origami literature opens up. BRING IT TO LIFE Finish a model and decorate it. Thirty-six vector stickers — eyes, mouths, whiskers, leaves, stars — in any colour, plus freehand drawing. Print it, share it as a picture, or keep it in your gallery. Twenty models can be set moving and saved as a looping GIF: the flapping bird flaps, the frog jumps, the tulip opens. FOLD WITH YOUR HANDS FULL Say "next", "back" or "again". Speech is recognised entirely on your device and no audio ever leaves it. Or let the app read each step aloud while you keep both hands on the paper. IPHONE, IPAD, MAC AND APPLE WATCH One purchase covers all four. On Apple Watch the Digital Crown becomes a fold scrubber: rotate to close the crease, feel a tap when it lands, and the step moves on by itself. Add a complication and the watch face puts you back at the step you left. Progress follows you between wrist, phone, tablet and desk. MAKE IT YOUR PAPER Choose the colour of both sides of the sheet, per model or everywhere, including a colour-blind-safe pair told apart by lightness rather than hue. Print true-size squares and grids from Paper Tools. Design your own snowflake in Snowflake Studio and watch the cuts mirror around the wedge. BUILT TO BE READ Full VoiceOver in the player, Dynamic Type throughout, Reduce Motion that swaps animation for clear before-and-after states, AA contrast, and Kids Mode that hides anything needing scissors. FIVE LANGUAGES, COMPLETELY English, Tiếng Việt, 日本語, Español and 简体中文 — not only the buttons, but every model name, every step instruction, every tip, lesson and glossary entry. Switch language in Settings and the whole app reloads in it. NO ADS. NO TRACKING. NO ACCOUNT. There is nothing to sign up for and nothing to collect. No analytics, no advertising, no third-party SDKs. Your progress and your photographs stay on your device, and the whole library works offline. Home: https://orlproducts.com/origamilearn.html Privacy Policy: https://orlproducts.com/privacy.html Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Got ideas or feedback? Send them our way: info@orlproducts.com