If you're looking for another Boo.ai alternative, Rytr is worth a look. Rytr uses AI to help you write faster with tools like AI autocomplete, grammar checking and content optimization. It also offers a plagiarism detection tool powered by Copyscape, and has several pricing tiers including a free version. The tool can help you generate high-quality content quickly.
Another top contender is Grammarly, which offers personalized advice and text generation to help you write better. It's got tools like contextual suggestions, plagiarism detection and style guide help. It offers several pricing tiers, including a free version, and can help you write more accurately and efficiently.
If you want to focus more specifically on preserving your writing style, try Reword. Reword offers a personalized writing assistant trained on your own writing style and includes tools for coauthoring, fact checking and SEO optimization. It supports more than 25 languages and integrates with common content management systems, so it's a good option if you want to improve your writing gradually.