AI Tool Comparison
A side-by-side breakdown to help you pick the right tool for your workflow.
Review Score assesses product quality; Fit Score is specific to a use case. Limited reviews do not establish overall product quality. How reviews work.
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.
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.
Catalog updated: August 2026
Grammarly and QuillBot both compete in Writing, overlapping most directly on writing.
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. Lean toward QuillBot instead if nine predefined rewriting modes plus unlimited custom styles matters more for your use case.
Choose QuillBot if…
Best for rephrasing existing text into a cleaner or more formal version without rewriting from scratch, and its edge is nine predefined rewriting modes plus unlimited custom styles. The go-to for students and non-native English writers polishing a draft, not for generating new content. Lean toward Grammarly instead if built-in AI agents now draft and rewrite across your apps, not just proofread matters more for your use case.
| 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) |
| TWF Review Score | Limited review: 3/5Not a product-wide score | Not yet reviewed |