Ever get sick of a character who does the same thing over and over again, like frowning, smiling, grimacing, etc? You can solve the problem by making sure you don't have too many repeated phrases in your manuscript.
Pro Writing Aid will identify your most frequent phrases so you can check that you are not overdoing the same actions or descriptions.
Eliminating duplicated words and phrases is one of the best ways to improve your writing. We often repeat things without noticing and it's notoriously difficult to spot repetitions yourself. Your brain just doesn't register them. You're better off getting get someone else to read your writing for you and notice any repeated words or phrases, or use a computer program (a machine will never overlook a repetition).
If you are writing a blog then this report is useful for seeing how often you have repeated your keywords online.