Grammarly vs QuillBot
A side-by-side comparison of capabilities, autonomy, integrations, and pricing to help you choose.
Short answer: choose Grammarly if you want ai writing assistant that checks, rewrites, and drafts across 1m+ apps and sites (Copilot, freemium); choose QuillBot if you want ai writing assistant for paraphrasing, grammar checking, summarizing, and citations (Assistant, freemium).
| Grammarly | QuillBot | |
|---|---|---|
| What it is | AI writing assistant that checks, rewrites, and drafts across 1M+ apps and sites | AI writing assistant for paraphrasing, grammar checking, summarizing, and citations |
| Type | product-with-agents | agent |
| Autonomy | Copilot | Assistant |
| Pricing | freemium · $12/member/mo (Pro, billed annually) | freemium · $8.33/mo (billed annually) or $9.95/mo monthly |
| Best for | consumers, smb, mid-market, enterprise | consumers, smb |
| Deployment | saas, api | saas |
| Modalities | text, browser, email, api | text |
| Models | proprietary, model-agnostic | proprietary |
| Protocols | rest-api | none |
| Integrations | Gmail, Google Docs, Microsoft Word, Microsoft Outlook, Slack, Chrome | Chrome, Microsoft Edge, Safari, Microsoft Word, Google Docs (via extension), Gmail |
| Capabilities | 5 documented | 6 documented |
Grammarly
- +Works almost everywhere people write (1M+ apps and websites, browsers, email, and desktop apps)
- +Strong free tier with usable everyday grammar, spelling, and tone checking
- +Combines deterministic proofreading with generative drafting and task-specific writing agents in one tool
- -Core behavior is inline suggestions, not autonomous action; the 'agents' are supervised and task-scoped
- -Generative and detection features (rewrites, plagiarism, AI detection) are gated behind paid tiers
QuillBot
- +Strong, popular paraphrasing tool with multiple rewrite modes and a generous free tier
- +Broad surface coverage: web app, browser extensions, Word add-in, and mobile/desktop apps that work across Gmail, Docs, LinkedIn, and more
- +Useful integrated academic stack (citations, plagiarism check, summarizer) under one affordable subscription
- -Assistant-grade only: it suggests and rewrites, it does not autonomously research, draft, or take actions end-to-end
- -Free tier is heavily capped (reportedly ~125-word paraphrase/humanize limits) and the best modes are paywalled
Which should you choose?
Grammarly is ai writing assistant that checks, rewrites, and drafts across 1m+ apps and sites, best for consumers, smb, mid-market, enterprise. QuillBot is ai writing assistant for paraphrasing, grammar checking, summarizing, and citations, best for consumers, smb. The right choice depends on the autonomy level you want, your existing integrations, and your budget, all compared above.