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The phrase 'is functional' is correct and can be used in written English.
It is typically used to describe something that is performing its intended purpose. For example, "This kitchen appliance is functional and ready for use."
Dictionary
is functional
adjective
In good working order.
Exact(58)
The furniture is functional, too.
Its primary role is functional.
Cold is functional, and it is modern.
"None of this equipment is functional.
The office is functional, exuding efficient workmanship.
The driver's environment is functional and understated.
"The exterior is functional," he said.
This speaks to that and is functional.
"And it is functional, but not flashy".
Yet much of her work is functional.
Similar(1)
For example: "For apes… sex is functional… for reproduction".
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com