Grammarly vs QuillBot

Grammarly is primarily a grammar and writing assistant. QuillBot is primarily a paraphrasing tool that also does grammar. If you need to rewrite content in different styles, QuillBot wins. For overall writing quality, Grammarly wins.

Verdict

Grammarly is the better all-around writing tool. QuillBot is the better paraphrasing tool. If you frequently need to rewrite content in different tones or styles, QuillBot earns its keep. For general writing improvement, Grammarly's free tier is hard to beat.