There are so many things editing software can't do. It can scan for things like repeated words, or it can let you know if a particular sentence structure is a fragment, or if some sentences are improperly punctuated. Editing software is not really created for fiction writing, though. Editing a novel goes way beyond telling the author whether all the words are spelled and capitalized correctly and whether all the commas are in the right place.
Editing software is hopeless at assessing lapses in voice or style and in determining whether sentences flow correctly. In fact, it will often flag something as an error, even if an author deliberately (or unconsciously) included it in the service of voice, flow etc. It also can't pick out lapses in character or narrative voice. It can't tell you about plot holes, nor can it detect those little narrative inconsistencies that creep in (like a minor character going from having green eyes to blue), nor can it pinpoint mistakes in story mechanics, nor can it flag author misconceptions about how something works in the world (like tides or moon phases, animal behavior, a particular poison, or symptoms of a disease), nor can it spot inconsistencies in a story's timeline etc.
Heck, human editors at trade publishers miss things like this sometimes, but if you have too many editorial mistakes in a novel, readers will get frustrated with the constant need to suspend disbelief. And writing that is dry, voiceless, choppy, or uneven will be frustrating to read, even if punctuation is technically correct.
So if you want to use editing software, you need to understand how limited it is and you need to be generally knowledgeable about grammar and punctuation, and you need to be well versed on how "rules" of fiction differ from rules of technical writing. If you can't afford a human editor, you need to find some really good beta readers who are willing to go through your story with a fine-toothed comb and provide specific feedback about the kinds of things an editor otherwise might, but for free (or in exchange for your own beta reading).