I think this piece of software is largely unnecessary. Not because it pretty much misses completely obvious mistakes (such as capitalizing first letters), or because it tries to suggest completely unnecessary (and sometimes even straight up wrong edits), but rather because it completely ignores the simple yet important errors with an overdone effort to impress you with some obscure English grammar rule... that actually turns out to be completely wrong in the context. Where Oxford dictionary says 'You do not need,' proofread bot will say 'Must.' (I'm talking about the error 'No Comma Before Restrictive Relative Clause' (Which is actually completely wrong because no comma is optional, not mandatory)) See? It's this kind of complete and utter bullshit that makes this add-on just complete crap. If you want something simple to check your It's vs Its, you aren't getting that here. Just some bullshit add-on that tries to [incorrectly] change your sentences to completely different garbage.
While I understand that the creator of the app wants you to put improvements in his program, to miss the most obvious of errors in favor of some obscure (and wrongly implemented) bullshit is completely inexcuable. I'm not going out of my way to make a report about how you need to capitalize the first word in a sentence.
Just an example:
(An Original Sentence)
Now that I know how to read…
(After Proofread Bot)
Now, that I know how to read…
A Conjunctive Adverb must be followed by a comma if you position it at the beginning of the sentence to indicate result, concession, apposition, addition, time, contrast, summary, or reinforcement.
First and Second Person
The more formal the writing, the more you should avoid using first and second person.
Proofread Bot has no suggestion for this issue since you may need to rewrite this part of your text.
See this bullshit? It's trying to tell me not to write in first person!
But what about the 'Ignore' button you ask? Do you know how many times I use the word 'I' in a first person story? You want me to click ignore for all 270 of your bullshit 'errors?' Thanks, but no thanks. Take my one star and return whence you came: the garbage bin.