Question: I'm looking for a grammar and sentence structure checker to improve my writing quality.

If you want a more powerful grammar and sentence structure checker, Grammarly is a good option. The AI-powered writing assistant offers customized advice and text completion to help you write faster and better. It also has features like contextual suggestions, plagiarism checks and citation help, and its plans range from free to enterprise.

Another good option is Paperpal, which is geared specifically for academic writing. It offers real-time grammar checking, plagiarism checking and a paraphraser that maintains a formal tone. Integrations with MS Word and high-quality academic translations in more than 25 languages make it a good tool for writers.

If you need to write in multiple languages, LanguageTool is another good option. It checks grammar, offers tone suggestions and can paraphrase, and plugins for various writing tools and standalone apps for macOS, Windows and iOS mean it's good for professional and academic writers who need to produce well-written documents in multiple languages.

Last, Trinka is a specialized writing assistant for academic and technical writing. It's got a grammar checker, plagiarism checker and tools to improve sentence structure and word choice. Integrations with MS Word and other tools mean Trinka can help you with writing in many contexts, with a focus on clarity, concision and impact.