Grammarly vs QuillBot
Grammarly is strongest at grammar, clarity and tone while you write; QuillBot is built around paraphrasing and summarizing existing text. Both use your inputs for AI training by default, with an opt-out.
Key differences
- Focus: Grammarly suggests edits as you type; QuillBot rewrites, summarizes and paraphrases text you paste in.
- Price: QuillBot Premium is $8.33/month billed annually; Grammarly Pro is listed at $12/month.
- Free plan: both have one; QuillBot's free paraphraser is limited to 100 words at a time.
- AI training: both train on user content by default; Grammarly has a training control in account settings, and QuillBot offers one in its browser extension (Team Plan inputs are excluded).
- Company: Grammarly is part of Superhuman; QuillBot is part of Learneo.
Side by side
| Grammarly | QuillBot | |
|---|---|---|
| Free plan | Yes: free plan with spelling and grammar fixes, tone detection and 100 AI prompts. | Free plan: paraphrase up to 100 words in 2 modes, basic grammar fixes and basic summaries. |
| Pricing | Pro $12/month on the plans page (billing period not shown there); free trial available. Check terms at checkout. | Premium $8.33/month billed annually (US pricing page); monthly billing costs more. |
| Platforms | iOS, Android, Web, Mac, Windows | Web, Mac, Windows, iOS, Android |
| AI features | AI writing assistant and prompts; Full-sentence rewrites and tone adjustments; AI agents | AI paraphrasing in multiple modes; Summarizer; AI humanizer and AI detector |
| Used to train AI? | Possibly. The privacy policy says Superhuman (Grammarly) uses collected information to train its AI models, and you can turn off training on your content with a control in account settings. | Possibly. QuillBot's help center says inputs and usage data are used for training by default. Account holders can opt out in the browser extension's Data and Privacy settings, and Team Plan inputs are never used. |
| Privacy | Grammarly is now part of Superhuman Platform Inc.; Says it makes money from paid plans, not by selling user content; Shares cookie and ID data with ad partners, which may count as "sharing" under some privacy laws; Privacy policy effective July 6, 2026 | QuillBot is part of Learneo, whose privacy policy covers its services; Text inputs are stored by default; extension users can turn storage off; Says it doesn't let third-party providers train their AI models on your data; Shows interest-based ads with consent or as the law allows |
| Best for | Anyone who writes daily and wants AI help with clarity and tone. | Students and professionals who want quick rewrites and summaries. |
| Last verified | Oct 16, 2026 | Oct 16, 2026 |
We don't declare a winner: the right choice depends on budget, platform and how you feel about AI processing your data. All facts link to sources on each app's page.