Short answer first. There is no QuillBot vs Grammarly comparison in our dataset, and that absence is itself the finding: across 30 AI writing comparisons covering 20 tools, the two never meet head to head. They share exactly one common opponent, Wordtune, and the triangle those three comparisons form is the honest way to score them against each other.
The triangle
| Comparison in our data | Prices | The verdict, in brief |
|---|---|---|
| Wordtune vs QuillBot | $9.99 vs $9.95 | QuillBot wins on breadth: paraphraser, grammar checker, summarizer and citation generator in one plan |
| Grammarly vs Wordtune | $30 vs $9.99 | Grammarly wins as the complete assistant; Wordtune wins on price and rewrite nuance |
| TextCortex vs QuillBot | $6.99 vs $9.95 | QuillBot wins for students and citation work; TextCortex wins for professionals, in the browser, at $6.99 |
Read the three verdicts together and a consistent picture forms. QuillBot at $9.95 is the breadth play for students: the dataset's own best-for lines give it paraphrasing and citation generation for academics, twice. Grammarly at $30 is the completeness play for professionals, with grammar, tone and plagiarism checking in one assistant. Wordtune at $9.99 beats neither on scope; it survives both comparisons on the same narrow strength, sentence-level rewriting, and on price against Grammarly. Our wider writing tools survey covers the category's free options; this page is the head-to-head that the category itself never staged.
The price shape
QuillBot and Wordtune sit within four cents of each other, both under ten dollars, and TextCortex undercuts them at $6.99. Grammarly stands alone at $30, three times QuillBot's price, and its verdict explains the premium as completeness rather than rewrite quality. So the QuillBot vs Grammarly answer, scored through their common opponent: under ten dollars and citation-shaped, QuillBot; three times the price and everything in one place, Grammarly; and Wordtune, beaten twice, is the reason we can say so from data instead of opinion.
Sources: comparison format modeled on Coursiv, QuillBot vs Grammarly: Which Writing Tool Is Right for You?. All prices and verdicts from this site's own comparison dataset (210 comparisons), read November 5, 2026.