Nice
Love it
Yes, Four is completely free and it doesn't have any in-app purchases or subscriptions.
✅ The Four app appears to be high-quality and legitimate. Users are very satisfied.
Four is free.
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Love it
Just started using the app a few minutes ago and have to say - it’s excellent. Very clean, clear 3-D models depicting the inner workings of the automobile.
Good application
Almost magical 3D presentation n of the Otto 4-stroke, with overviews of its operation and many detailed sections and gorgeous yet clear illustrations. Highly recommend.
The explanation of how a 4-stroke engine works are very clear and easy to understand. The model looks terrific and it is very satisfying to watch the pistons move up and down. To make this app better and more interesting, add more types of engines like for example, V6, V8, and an I6. Also, add a tachometer for RPM to give a representation of how fast an engine really spins. An explanation of more in-depth into an engine like bore • stroke and displacement. Also, explain the types of camshafts there are like for example, SOHC and DOHC and valves. Maybe just to polish it up, improve the graphics quality.
Needed an app that gave good visuals and animation to show son basic engine theory. This delivers .... WITHOUT ADS!
Amazing app for learning about cars but one thing is they should add more types of engines
Seriously good breakdown of the basic function and automation of an engine. A fantastic visual learning aid.
Really good, great representation of the whole car. I’d like to see though at least the name of the part I click or something like that. Still, great animations, free, with no ads!
The representation of the mechanics is fine but the RPM of the engine and the cylinder stroke cycle is unrealistically slow. Also, the bend or dip in the timing belt on top is unrealistic, it should be taut.