GRAMMARLY VS PROWRITINGAID VS QUILLBOT
The definitive grammar and editing AI tool battle — accuracy, style improvement, and rewriting capabilities compared across three leading platforms.
Grammarly
AI-powered writing assistant for grammar, clarity, and style improvement
ProWritingAid
In-depth writing analysis and editing tool for serious writers
QuillBot
AI paraphrasing and writing tool for rewording and improving text
/// THE_VERDICT
Grammarly remains the gold standard for grammar and editing with an 8.7 consensus score driven by its real-time accuracy, tone detection, and seamless integration across every writing surface. ProWritingAid offers deeper style analysis and is the writer's choice for long-form revision, earning a solid 8.5. QuillBot's paraphrasing engine is useful for quick rewrites but lacks the comprehensive editing depth of its competitors, landing at 7.6.
SCORE BREAKDOWN
DEEP DIVE
Grammarly
AI-powered writing assistant for grammar, clarity, and style improvement
/// JUDGE_SUMMARIES
"Grammarly's evolution from a grammar checker to an agentic AI writing platform — now part of Superhuman — represents the most significant product transformation in its history, with specialized AI agents for Expert Review, Reader Reactions, Citation Finding, and AI Detection expanding its utility well beyond traditional proofreading. The restructured Free/Pro/Enterprise pricing with Pro at $12/mo annually, multilingual support across 6 languages, and ubiquitous integration across 1 million+ apps make it the most accessible and broadly useful writing improvement tool available."
"Grammarly is a writing companion that works across many apps, helping you improve grammar, clarity, and tone as you go. Its AI-assisted rewrites can speed up polishing, but it’s still primarily an editing layer rather than a full drafting-and-planning workspace."
"Grammarly's deeper integration into the 'Superhuman Platform' in 2026 has elevated it from a checker to a true communication intelligence layer. It remains the gold standard for professional polish, offering unmatched security and ubiquity across every app and device you use."
/// STRENGTHS_WEAKNESSES
Writers and professionals who want AI-powered proofreading and style improvement everywhere they write
ProWritingAid
In-depth writing analysis and editing tool for serious writers
/// JUDGE_SUMMARIES
"ProWritingAid offers the deepest writing analysis available with 25+ specialized reports covering style, structure, readability, pacing, dialogue, and more — making it the tool of choice for serious writers who want to genuinely improve their craft rather than just fix surface-level grammar errors. The lifetime pricing option at approximately $399 represents outstanding long-term value, and the AI Sparks generative features add useful rephrasing capabilities, though they remain secondary to the analytical core that distinguishes ProWritingAid from its competitors."
"ProWritingAid is built for writers who want to improve, not just correct typos, with deep reports that explain patterns and offer actionable fixes. It’s especially useful for long-form revision passes, but the interface can feel dense and real-time suggestions may slow down on large documents."
"ProWritingAid continues to be the serious writer's best friend in 2026, offering deep structural analysis that goes far beyond grammar. With the new 'Novel Beginnings' initiative and enhanced Premium Pro features, it shows a commitment to nurturing long-form storytelling that no other tool matches."
/// STRENGTHS_WEAKNESSES
Serious writers and authors who want deep analysis to improve their writing style, not just fix grammar
QuillBot
AI paraphrasing and writing tool for rewording and improving text
/// JUDGE_SUMMARIES
"QuillBot serves a specific and well-defined niche as a paraphrasing and rewording tool, with its multiple paraphrasing modes (Standard, Fluency, Formal, Simple, Creative, Expand, Shorten) offering genuine variety in how text can be restructured. The bundled grammar checker, summarizer, and translator add useful ancillary value, but the core utility remains narrow compared to comprehensive AI writing platforms, and paraphrasing quality varies noticeably across modes with occasional meaning distortion."
"QuillBot is a practical tool for quickly rewording text with multiple paraphrasing modes and controls. It’s especially useful for short passages and iterations, but you need to review closely to avoid meaning drift or awkward phrasing."
"QuillBot remains the king of rewriting in 2026, with its 'Humanize' text features and unlimited paraphrasing modes proving essential for students and academics. It's a focused tool that does one thing—refining text—exceptionally well."
/// STRENGTHS_WEAKNESSES
Writers and students who need quick, reliable paraphrasing and rewording assistance
PRICING COMPARISON
| Grammarly | ProWritingAid | QuillBot | |
|---|---|---|---|
| Free Tier | ✓ Free plan with basic grammar and spelling checks | ✓ Free plan with 500-word limit per check | ✓ Free plan with limited paraphrasing and basic modes |
| Pro Price | $12/mo | $20/mo | $19.95/mo |
| Team / Enterprise | $15/mo per member | $24/mo per member | $3.75/mo per member |
RELATED BATTLES
/// SYS_INFO Methodology & Disclosure
How we rate: Each AI model receives the same structured prompt asking it to evaluate each tool across profession-specific criteria on a 1-10 scale. Models rate independently — no model sees another's scores. Consensus score = average of all three judges. Agreement level = score spread.
Profession criteria: Tools are evaluated on criteria specific to writers workflows, including quality, ease of use, pricing value, and domain-specific capabilities.
Affiliate disclosure: Links to tool signup pages may earn us a commission. This never influences AI ratings.