Review Detail of Salafir in Otaku girl in multiverse

Isn't Grammerly free? It highlights spelling errors and weird use of past and present tense. If English is your 29th Language I recommend it....makes your story more how do you call it ... understandable. If I want to play a guessing game I try reading what my nieces write. But I kinda expect at least readable stuff... Is that too much... please tell me.