There is no one answer to this question as different people may use different software for proofreading, depending on their preferences. Some popular options for proofreading software include Grammarly, ProWritingAid, and Hemingway Editor. However, there are many other options available, so it is best to do some research to find the best option for you. Some factors to consider when choosing proofreading software include features, ease of use, and price.