QuillBot vs Grammarly, which is better for students?

Both QuillBot and Grammarly are popular with students but they serve very different purposes. After using both for a full semester, here’s my comparison.

Core Purpose

Grammarly is primarily a grammar and writing quality checker. It catches errors, suggests improvements, and helps you write more clearly. QuillBot is primarily a paraphrasing tool. It rewrites text to say the same thing differently.

This is a fundamental difference that many students miss. They’re not competing products, they’re complementary tools.

Grammar and Spelling

Grammarly wins here by a mile. Its grammar engine catches errors QuillBot doesn’t even look for. If you need help with writing mechanics, Grammarly is the clear choice.

Paraphrasing

QuillBot is the better paraphraser. It offers multiple modes (Standard, Fluency, Formal, Creative, etc.) and does a solid job of restructuring sentences while preserving meaning. Grammarly’s rewrite suggestions are more limited and less flexible.

AI Detection Risk

This is important. QuillBot’s paraphrased output is more likely to trigger AI detection than Grammarly’s grammar fixes. When you paraphrase an entire paragraph, the output pattern can look AI-generated even if the original was human-written. Grammarly’s corrections are minimal enough that they shouldn’t affect AI detection scores.

Pricing

Grammarly Premium is about $12/month (with student discount). QuillBot Premium is about $8.33/month billed annually. Both have functional free tiers. If budget is tight, Grammarly’s free version is more useful for everyday writing than QuillBot’s free tier.

My Recommendation

Use Grammarly for all your writing to catch errors and improve clarity. Use QuillBot sparingly and specifically for paraphrasing source material in your own words (not for rewriting AI-generated text). Together they cover most student writing needs.