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Inn0cent_S0ul I already use it.
However, it can't detect mistakes when they involve existing words. One I make often, and I noticed like yesterday that it's not correct, is using mines as in "mine" pronoun but plural. (the books are mines, e.g.). This can't be detected by algorithms (maybe this one case yes, but not every time).
I was even thinking to look for another app and see if it detects more, but Grammarly seems one of the best...