If you're looking for a free AI writing tool, you'll want to check out Spark Writer. This new tool will help you improve your writing skills by providing feedback and suggestions.
Spark Writer is easy to use. Type in your text, and the tool will analyze it for grammar, spelling, and style. It will then provide you with suggestions on how to improve your writing.
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VocabularySpellingCity provides the following sets of correlations to standards:
U.S. Standards by State
Common Core Standards for each States' Implementation
Australian Standards by State
Canadian Standards by Province
English National Curriculum Standards
I like it, but I prefer free.
Paper Rater is free, no strings attached, and seems to perform all the same functions if not more. Additionally, it offers instruction in some areas that might be weak, such as vocabulary. http://www.paperrater.com/