If you're looking for a Professionalize It To Me alternative, QuillBot is worth a look. The suite of AI-powered writing tools includes a paraphraser, grammar checker, plagiarism detector and translator. It can help you improve the quality and speed of your writing, which is why it's geared for professionals trying to communicate more effectively.
Another contender is Linguix, which is geared to help teams cut hours out of communication chores. It offers an AI-powered writing copilot, a content score to grade text quality, and message shortcuts to speed up the writing process. Linguix works on a range of tools including Google Chrome, MS Office and Slack, so it's a good option for teams that need to communicate better.
If you're looking for a Slack-specific tool, Felix is a good option. It drafts messages in the right tone and style, with options to fine-tune results and check for spelling and grammar. Felix comes in three pricing tiers, including a free version, so it's good for people with modest needs or a lighter budget.
Last is LanguageTool, which offers more-advanced language checking and paraphrasing tools in more than 30 languages. It offers plugins for various writing tools and standalone apps, so it's good for individuals and teams. With its suggestions for grammar and tone, LanguageTool can help you improve your writing's quality.