Kayf vs Sciencity

Kayf is an illustrated encyclopedia of how things work. Pick any device, from the fan on your desk to the refrigerator, the microwave, your phone, a car engine, a wind turbine or an MRI scanner, and open it up. Every one of the 92 devices is a real 3D model, cut open so you can see inside: turn it in your hands, pull it apart, tap any part to learn what it does, and watch the moving parts run. Glowing streams show where the air, water, refrigerant, fuel or current actually goes. Then follow the animated step-by-step sequence of how the device works, with each part lighting up as it plays its role. Place any device on your desk in AR and walk around it at life size. 92 DEVICES IN 8 CATEGORIES - Home appliances: fan, refrigerator, air conditioner, washing machine, vacuum cleaner, water heater, iron, hair dryer, dishwasher, dryer, sewing machine, dehumidifier - Kitchen: microwave, kettle, blender, toaster, espresso machine, induction cooktop, gas stove, pressure cooker, rice cooker, air fryer, oven - Electronics: LED bulb, loudspeaker, microphone, noise-cancelling headphones, camera, television, remote control, lithium battery, electric motor, transformer, smartwatch - Computing and communication: smartphone, touchscreen, Wi-Fi router, processor, SSD and hard drive, printer, GPS, barcode scanner, fiber optics, Bluetooth - Transport: car engine, electric car, bicycle, jet engine, helicopter, how planes fly, ABS brakes, submarine, drone, elevator, escalator, traffic light - Energy: solar panel, wind turbine, hydroelectric dam, nuclear reactor, generator, power grid, gas power plant, desalination, UPS, geothermal - Everyday mechanisms: lock and key, toilet flush, mechanical watch, zipper, bicycle pump, thermostat, smoke detector, doorbell, digital scale, ballpoint pen, aerosol can, fire extinguisher, faucet, 3D printer, power drill - Medical and science: X-ray, MRI, ultrasound, blood pressure monitor, stethoscope, pulse oximeter, infrared thermometer, microscope, pacemaker, defibrillator, telescope FOR EVERY DEVICE - A full 3D model you can turn, zoom, cut away and take apart - Labelled callouts that name every part on the model - Tap a part to learn its role and material - AR mode: stand the device on a real table and look inside it - Animated how-it-works sequence, step by step - The science: several paragraphs on the physics and the design choices - By the numbers: power, speed, temperature, efficiency, lifespan - Surprising facts, types and variants, safety notes - Related devices and the principles they share THE PHYSICS - 36 principles from electromagnetic induction to Bernoulli, each explained with a formula and everyday examples and linked to every device that uses it - A glossary of more than 110 technical terms in plain words KAYF PRO (one-time purchase) - All 92 devices - Troubleshooting guides: real symptoms, likely causes and what to do - Every quiz: five questions per device, category quizzes and the mixed challenge - Compare two devices side by side Fully in English and Arabic with true right-to-left layout. No account, no ads, no data collection. Everything works offline. Kayf is an educational reference. Always follow the manufacturer's manual and a qualified technician for repairs.

Where does the light in your room come from? What happens to water after it goes down the drain? Why does it rain? Sciencity turns the everyday world into a living picture your child can poke, change and even break, so they can see how things really work. FIVE JOURNEYS, STOP BY STOP • How electricity gets to your house: make power with a dam, a coal and gas plant, a nuclear plant, a wind turbine or the sun, then follow it through the generator, the step-up transformer, the power lines and the substation to your light switch. • Water to your tap: collect water from a lake, a well, the sea or a rain tank, clean it, pump it into the water tower and send it through the pipes to your home and back out to the river. • The water cycle: watch the sun lift water from the ocean, forests, lakes and ice into clouds, then bring it back as rain and snow. • Natural gas to your home: follow gas from deep underground, a ship or a farm digester through processing, compressors and the city gate to your stove. • Building a home: pour the foundation, then add the frame, the walls, the roof and the windows, and move the family in. CHANGE THINGS AND SEE WHAT HAPPENS Every stop has something to try. Open the dam gate, start a storm on the power lines, burst a water pipe, take the dust out of the air or leave the steel out of the foundation, and watch the whole scene react. MISSIONS AND A QUICK QUIZ Each journey has missions to collect ("Find a rainbow", "Run the light, fan and TV at once") and ends with a short quiz. GROWS WITH YOUR CHILD Switch between ages 5–9 and 10–14. The pictures stay the same, but the explanations go from simple to more detailed. Tap "Read to me" to hear any explanation read aloud. MADE FOR FAMILIES • No ads • No in-app purchases • No accounts or sign-in • No data collected, and nothing leaves the device • Works fully offline • Supports light and dark mode, and respects reduced-motion settings Questions or ideas? Email support@akiraapps.com.