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Discover LudwigThe phrase "are both useful" is correct and usable in written English.
You can use it when referring to two or more items or concepts that provide value or benefit in a particular context.
Example: "The two methods we discussed are both useful for improving productivity in the workplace."
Alternatives: "are equally beneficial" or "are both advantageous".
Dictionary
are both useful
determiner
Each of the two; one and the other;
Exact(47)
These dynamics, Spence told me, are important to understand if we want to develop technologies that are both useful and used — not to mention effective.
US and CT are both useful in diagnosis of diverticolitis, and their sensibility and specificity are similar.
All constraints are both useful and challenging at the same time.
As measures of where nations rank today, they are both useful.
These dynamics, Spence told me, are important to understand if we want to develop technologies that are both useful and used not to mention effective.
With everyone at a different level, hollered words of encouragement from the other yachts are both useful and uplifting, while the advice and yarns exchanged during communal suppers in restaurants and pubs along the route are invaluable.
Similar(12)
Results from the questionnaire showed that most patients found the app to be both useful and easy to use.
It is both useful and salutary to have so comprehensive a map to guide us.
The wiretaps were both useful and sad.
The advice is both useful and unisex.
But in the meantime, oil is both useful and precious.
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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