What exactly is proofreading?
Everyone’s different, and their documents are different. It’s hard to make rules for them all, so we’re flexible.
FastProof is designed to be fast, inexpensive and good quality. To fulfil the promise of bringing proofreading to everyone, we correct only spelling, punctuation and basic grammar. Correcting basic grammar means fixing missing words, an incorrect plural, replacing “than” with “then” — miscellaneous things like that. We love it.
So FastProof corrects mistakes but doesn’t try to “improve” your writing — it doesn’t try to find a better word than the one you’ve used.
We take the view that your writing is perfect, but there could be unintentional flaws (as anyone might leave). We spot and correct such flaws quickly, so the price stays down. Lingering over what you’ve said to consider how one might say it better takes longer, so we don’t do that. Unless you ask us to, then we give it to WordShine.
If the author is a native English speaker, FastProof is probably all you need to polish the writing.