Grammarly includes a plagiarism checker with unlimited scans, while QuillBot's plagiarism checker is limited to 20 pages per month.
QuillBot offers translation capabilities in up to 30 languages, whereas Grammarly supports English, including American, British, Canadian, Australian, and Indian variants.
Grammarly features an intuitive interface with integrations across over 500,000 apps and websites. QuillBot has a user-friendly interface compatible with macOS, Microsoft Word, and Google Chrome.
Grammarly's Pro Plan is priced at $12 per month (annual billing), while QuillBot's Premium Plan costs $8.33 per month (annual billing).