Great for

• Reducing time spent second-guessing and proofreading for social media managers and customer service specialists
• Comprehensive proofreading for more intricate grammar-checking available at the paid tier
• Works with Gmail, Facebook, Twitter, LinkedIn, and most other places on the web
• Scans your text for common and complex grammatical mistakes, spanning everything from subject-verb agreement to article use to modifier placement
• You’ll get detailed explanations for all your mistakes and weekly progress reports

Be aware that

• Free plan covers basic grammar checks, but the premium has more advanced error checking
• Needs to be online to work