Question: Is there an AI-powered grammar and spell checker that can help me refine my writing?

Grammarly is a top choice, with personalized advice and text completion to help you write faster and better. It's got features like contextual suggestions, plagiarism detection, citation formatting and integration with many apps and websites. Grammarly offers free, premium, business and enterprise levels, with a focus on protecting users' privacy and security.

Another powerful option is LanguageTool, which supports more than 30 languages and language varieties. It's got grammar checking, tone suggestions and paraphrasing tools, so it's good for pros and students. LanguageTool is available as browser extensions, email plugins and standalone apps for Windows, Mac, Linux, Chrome OS and Android. It's free and premium, with the premium version offering more features.

For a full-featured writing assistant, check out Ginger. It's got advanced grammar and spell checking, context-sensitive corrections and tools to improve style and clarity. It works in Gmail and Microsoft Word and other apps, and there are different versions for individuals, businesses and schools, with an accessible interface.

Last, QuillBot offers a range of AI-powered writing tools, including a paraphraser, grammar checker and plagiarism detector. It's designed to help you from first draft to final draft, and its interface is accessible to writers of all skill levels.