Schematic vs Kayf
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Schematic
Learn about the everyday systems you interact with, from electricity and plumbing to home appliances and engineering principles. Short, engaging lessons with visual diagrams and quick quizzes help you understand how things work.
- Short, 2-minute lessons
- Self-drawing diagrams
- On-screen captions
- Three-question quizzes
- Covers electricity, plumbing, appliances, and engineering
- No account required
- Progress saved locally
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You live surrounded by systems you can't explain. The breaker panel in the hallway. The boiler that makes a noise you've decided to ignore. The valve someone once told you to find "in case of emergency." Schematic fixes that. HOW IT WORKS Each lesson runs about two minutes. A narrator walks you through a diagram that draws itself as it goes — one card at a time, captioned on screen — and ends with three quick questions so you know it landed. Take one with your coffee, or work through a whole track in an afternoon. WHAT YOU'LL COVER • ELECTRICITY — circuits, volts, amps and ohms, grounding, the third hole in the outlet, and why the breaker trips when the kettle goes on • HOME APPLIANCES — what is actually happening inside the kettle, the fridge, the microwave, the washing machine and the vacuum • PLUMBING — water pressure, P-traps, water heaters, banging pipes, and the shut-off valve you will be glad you found early • ENGINEERING — levers, gears, pulleys, torque, why triangles hold buildings up, and why everything has a frequency it hates NO ACCOUNT NEEDED No sign-up, no profile, no setup. Open it and start. Your progress stays on your device. Schematic is educational. It is here so you understand the systems you live with and can talk about them with confidence. It is not a repair manual, and it is not a substitute for a qualified electrician, plumber or gas engineer. Privacy Policy: https://schematic-app.web.app/privacy Terms of Use: https://schematic-app.web.app/terms
Kayf
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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.
Screenshots
Verdict
The clearest difference is iOS requirement: Kayf at 18.0 against Schematic's 26.0. On price, update cadence, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Schematic sells 2 in-app purchases, starting at $69.99 per year and Kayf sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
Both ship on a similar rhythm, roughly every 5 days. Both last shipped on October 9, 2026.
| Parameter | Schematic | Kayf |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (26 ratings) — better | — |
| Number of ratings | 26 — better | — |
| Update frequency | Every 5 days | Every 5 days |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Freemium | — |
| Devices | iPhone | iPhone |
| Requires iOS | 26.0 | 18.0 — better |
| Further details — not scored | ||
| Size | 205 MB | 18 MB |
| Age rating | 4+ | 4+ |
| Developer | Pavlo Dobronos | Tariq Al-aqrabawi |
In-app purchases
Schematic
- Yearly7 Days trial$69.991 Year
- Yearly1 Month trial$69.991 Year
Kayf
- Kayf Pro$4.99









