How does color coding work in QuillBot Grammar Checker, and why are some words red or blue?

QuillBot Grammar Checker uses color coding to make it easy to spot issues in your text:

• Red highlights = Grammatical Errors
  These mark mistakes in grammar, spelling, or punctuation that need correction.
• Blue highlights = Recommendations (Premium)
  These are suggestions to improve clarity, readability, and style. They aren’t errors, but applying them can make your writing stronger.

This system helps you quickly see what must be fixed (red) and what can be improved (blue), making editing faster and easier.