Grammarly vs QuillBot: which is right for your writing
The two most widely chosen AI writing assistants, compared head to head to help you decide based on what you write and in which language.
Grammarly and QuillBot tend to show up together in any search for "AI grammar checker," but they solve different needs: one targets everyday team communication, the other paraphrasing and academic writing in English.
Comparison
Grammarly
AI CommunicationAI writing checker and assistant that improves tone, clarity and grammar in emails, documents and internal messages.
- Works inside the browser and most writing apps, no need to switch tools
- Beyond grammar, it suggests tone adjustments based on context (formal, casual, direct)
QuillBot
AI WritingSuite of AI tools for paraphrasing, fixing grammar and improving writing.
- Very polished, fast paraphrasing and grammar correction
- Browser extension with strong adoption, works right inside Gmail, Docs and LinkedIn
The key difference
Grammarly is built for everyday team communication: it corrects grammar, but its real strength is adjusting tone in emails, Slack, Google Docs and pretty much anywhere you already write, whether it's a short message or a long report. QuillBot is more specialized: its strength is paraphrasing academic or professional text in English, generating citations in APA or MLA format, and flagging content that's likely AI-generated — built for students, researchers and writers who work in English as a second language.
If you need your team's day-to-day communication to sound consistent across channels, Grammarly fits better. If your work is mostly academic or research-focused in English and you need to paraphrase or cite sources, QuillBot has more specific tools for that. Neither fully replaces the other — some people end up using both for different things.
Frequently asked questions
Which is better for a team's day-to-day communication?
Grammarly, since it adjusts tone as well as grammar and integrates with Gmail, Slack and Google Docs, the places a team already writes every day.
Which is better for academic writing in English?
QuillBot, which adds mode-based paraphrasing, an APA/MLA citation generator, and AI and plagiarism detection, built for students and researchers.
Does either one work well in Spanish or Portuguese?
Grammarly is primarily built for English but covers basic correction in other languages; QuillBot is notably weaker outside English, so for Spanish or Portuguese, Grammarly is the more solid option of the two.