It is useful.
It would be useful.
You need to find out about conditionals. 'Would be' is a conditional phrase that means that whatever is being discussed is not actually relevant unless something else happens. It is useful - present tense, the object has a use, I can use it.
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You need to find out about conditionals. 'Would be' is a conditional phrase that means that whatever is being discussed is not actually relevant unless something else happens.
It is useful - present tense, the object has a use, I can use it.
It would be useful - conditional, as you do not have the object / ability to do something, but IF you were to have it, THEN it becomes