Apples grow on trees, tomatoes grow on vines.

Apples are hard, tomatoes are squishy. 

The seeds in an apple are not eaten, whereas you barely notice the seeds in a tomato. 

Tomatoes are acidic, apples are not. 

The skins are quite different. Apple skins tend to be thicker, and hard to chew and digest. 

Apple: Whitish flesh. Tomato: Red or green flesh. 
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Apple is a fruit.we can eat apple without cooking.Apple is a good nutritious food. It is rich in iron. Apple tree grows in particular is a costly fruit. Tomato is a vegetable.we use it as fruit and vegetable. It costs cheap. It is rich in calcium. It grows at any atmosphere.