What is Grammarly?
Grammarly checks and improves writing in place — in your browser, in Word, in email — rather than in a separate window.
What it does well
Catching the errors that make business writing look careless, and adjusting register when a draft is too casual or too stiff.
Who should use it
Anyone who writes to clients daily, and especially people writing in English as a second language.
Who should not use it
Writers with a strong voice who will spend more time rejecting suggestions than accepting them, and anyone who needs drafting rather than editing.