AI Tool Comparison
Grammarly vs QuillBot
A side-by-side breakdown to help you pick the right tool for your workflow.
Grammarly
Catch grammar and clarity issues as you write, then let built-in AI agents draft, rewrite, and complete tasks across your apps. Grammarly's parent company rebranded to Superhuman in October 2025.
QuillBot
Paraphrase text in unlimited style modes while checking it for grammar errors, plagiarism, and AI-detection risk in one pass. AI Detector and AI Humanizer are now bundled into every premium plan.
Bottom Line
Last reviewed: August 2026
Grammarly and QuillBot both compete in Writing, overlapping most directly on writing. Grammarly carries the higher rating (4.7 vs 4.6), but a gap that size rarely overrides a real workflow fit on its own.
Choose Grammarly if…
Best for catching grammar and clarity issues in real time as you write anywhere online, and its edge is built-in AI agents now draft and rewrite across your apps, not just proofread. The baseline writing check most people should already have running.
Choose QuillBot if…
Best for rephrasing existing text into a cleaner or more formal version without rewriting from scratch, and its edge is eight distinct rewriting modes, from Academic tone to strict Shorten and Expand length controls. The go-to for students and non-native English writers polishing a draft, not for generating new content.
| Attribute | Grammarly | QuillBot |
|---|---|---|
| Category | Writing | Writing |
| Pricing | freemium | freemium |
| Pricing Detail | Free / $12/mo Pro (annual) / Enterprise custom | Free / $19.95/mo Premium (or $8.33/mo billed annually) |
| Rating |
Key Features
Grammarly
- Grammar and spelling checks
- Tone detection
- Plagiarism checker
- Generative AI co-creator
- Browser extension
QuillBot
- Paraphraser (7 modes)
- Summarizer
- Grammar checker
- Plagiarism checker
- Citation generator
Pros
Grammarly
- •Works everywhere you write
- •Highly accurate suggestions
- •Improves overall writing quality
- •Generative features are helpful
QuillBot
- •Best paraphrasing tool available
- •Extremely popular and trusted
- •Good free tier
- •Works across all writing tasks
Cons
Grammarly
- Premium plan is somewhat pricey
- Can be overly pedantic
- Generative features are basic compared to ChatGPT
QuillBot
- Output can sometimes lose nuance
- Plagiarism checker is weaker than Grammarly's
- Paraphrasing ≠ writing from scratch