Another good option is Paperpal, an AI-powered academic writing assistant that can improve language, grammar and clarity. It can suggest language based on context, flag plagiarism accurately, check grammar as you type and offer a paraphraser that maintains a formal voice. Paperpal can be used at any stage of writing, and it's used by major publishers and authors around the world.
If you're looking for something more flexible, check out StealthWriter. The tool can convert AI text into human-sounding material that evades the most popular AI detectors, and it comes with features like a plagiarism-free guarantee, search engine optimization and real-time customization. StealthWriter can handle multiple languages, and there are different pricing tiers for different customers.