ProofreaderPro.ai vs QuillBot: Best AI Tool for Academic Paraphrasing?

A postdoc in our network paraphrased three paragraphs of her literature review using QuillBot's Creative mode. The output read well — fluid, natural, clearly different from the source. One problem: it had rewritten "randomized controlled trial" as "randomized managed experiment." Her reviewer caught it. The revision cost her three weeks.

Technical terminology matters in academic writing. A good paraphrasing tool needs to know what to change and — just as critically — what to leave alone. We tested ProofreaderPro.ai and QuillBot across 25 academic passages to see which tool handles that balance better.

Feature Comparison: QuillBot vs ProofreaderPro.ai

Where QuillBot wins

QuillBot has earned its reputation for a reason. We'll give credit where it's due.

Eight paraphrasing modes give you control. Standard, Fluency, Formal, Simple, Creative, Expand, Shorten, and Custom — each produces distinctly different output. If you want a casual rewrite versus a formal one, you pick the mode. ProofreaderPro.ai offers a single academic-tuned mode. For writers who need flexibility across registers, QuillBot's approach has a real advantage.

The interface is dead simple. Paste text on the left, get paraphrased text on the right. Drag a slider to control how aggressively it rewrites. There's almost no learning curve. ProofreaderPro.ai has more features, which means a slightly steeper onboarding.

Grammar checking is included. QuillBot bundles a grammar checker alongside the paraphraser. It's not as deep as dedicated grammar tools, but it catches the basics. If you only need paraphrasing plus light grammar help, QuillBot covers both in one tab.

The price is competitive. At $9.95/month on the annual plan, QuillBot is affordable. The free tier is limited — 125 words per paraphrase — but the paid version removes that cap entirely.

Where ProofreaderPro.ai wins for researchers

QuillBot is a paraphrasing tool that added some editing features. ProofreaderPro.ai is an academic editing suite that includes paraphrasing. That distinction drives every meaningful difference between them.

Citation preservation is the big one. We tested 15 passages containing in-text citations. QuillBot restructured sentences in ways that moved, split, or dropped citations in 40% of cases. One example: "(Martinez & Chen, 2024; Liu et al., 2023)" became "(Martinez & Chen, 2024)" with the second reference simply gone. ProofreaderPro.ai kept every citation in its correct position across all 15 passages. When your paper has 80+ references, losing even one is unacceptable.

Technical vocabulary stays intact. Our test included discipline-specific terms from six fields. QuillBot's Creative and Standard modes altered established terminology in 25% of instances — "polymerase chain reaction" became "polymer chain response" in one alarming case. ProofreaderPro.ai's paraphrasing tool is trained on academic corpora and recognizes field-specific terms that shouldn't be changed.

You get a complete editing workflow. After paraphrasing, you probably also need proofreading. And maybe humanization if the paraphrased text sounds too mechanical. With QuillBot, you'd need separate tools for each step. ProofreaderPro.ai bundles AI proofreading, paraphrasing, humanization, summarization, and translation in one platform. One upload, multiple outputs.

Tracked changes matter for accountability. When you paraphrase sections of your literature review, your advisor may want to see exactly what changed. ProofreaderPro.ai gives you a .docx file with tracked changes. QuillBot gives you clean text only — no record of what was altered.

Fifty-plus languages versus thirty-three. Both tools support multiple languages, but ProofreaderPro.ai covers significantly more. If you're an ESL researcher who sometimes needs to paraphrase source material in your native language before translating, broader language coverage helps.

The real-world test: paraphrasing a literature review

We took a 500-word literature review section from a published environmental science paper and ran it through both tools. Here's what we observed.

QuillBot's Fluency mode produced the most readable output. Sentences flowed naturally. But it rewrote "anthropogenic climate forcing" as "human-caused climate pressure" — a change that sounds reasonable to a non-specialist but would raise eyebrows in a peer review. It also restructured a sentence in a way that separated a claim from its supporting citation.

ProofreaderPro.ai's output was less dramatically rewritten — and that's the point. It changed sentence structures, varied word choice, and reduced passive voice, but it kept "anthropogenic climate forcing" exactly as it was. Citations stayed attached to their claims. The paraphrased version was clearly different from the original but remained technically precise.

Who actually uses QuillBot — and why

QuillBot's core user base skews toward undergraduate students and content writers. That's not a criticism — it's a design reality. The tool is built for general paraphrasing at scale. When you need to rephrase a blog post, rewrite website copy, or quickly generate alternative versions of a paragraph, QuillBot excels.

The eight modes serve this audience well. A content writer might paraphrase the same paragraph in Creative mode for social media and Formal mode for a white paper. That flexibility is genuinely useful outside academia.

But academic writing doesn't need eight modes. It needs one mode that understands the rules of scholarly text. Your discipline has specific terms. Your citations follow specific formats. Your register should stay formal and precise. A single well-trained academic mode outperforms eight general ones for this specific use case.

Pricing and value

QuillBot Premium costs $9.95/month on the annual plan or $19.95 monthly. The free tier restricts you to 125 words per paraphrase — effectively useless for academic papers.

ProofreaderPro.ai costs $5 for the first month, then $10/month. The free tier allows 5,000 words/month with full features.

The price difference is small. The value difference is large. With ProofreaderPro.ai, you get paraphrasing plus proofreading, humanization, summarization, translation, and tracked changes export. With QuillBot, you get paraphrasing and a basic grammar checker. Feature for feature, ProofreaderPro.ai delivers more for a comparable price.

Our recommendation

Choose QuillBot if your primary need is general-purpose paraphrasing across different tones and styles. If you write blog posts, marketing copy, or student essays that don't involve technical terminology or formal citations, QuillBot's eight modes and simple interface are a great fit. It's also a solid pick if you specifically want a paraphrasing-only tool without additional features.

Choose ProofreaderPro.ai if you're paraphrasing academic text — literature reviews, discussion sections, thesis chapters — where citation preservation and technical terminology accuracy are non-negotiable. The combination of academic paraphrasing, full proofreading, and tracked changes makes it the stronger tool for researchers, graduate students, and ESL academics. Start with the paraphrasing tool to test it on your own writing.

Frequently asked questions

Q: Does QuillBot preserve APA or MLA citations when paraphrasing?

Not reliably. In our testing, QuillBot restructured sentences in ways that moved or dropped in-text citations in about 40% of passages. It treats citations as regular text rather than fixed elements. If your work includes heavy referencing, you'll need to manually verify every citation after using QuillBot. ProofreaderPro.ai is specifically trained to recognize and preserve academic citation formats.

Q: Can I use QuillBot for my thesis literature review?

You can, but proceed with caution. QuillBot may alter discipline-specific terms and rearrange citations. For a literature review — where accurate attribution is critical — we recommend using a tool with citation awareness. If you do use QuillBot, carefully check every paraphrased passage against the original for terminology accuracy and citation placement.

Q: Which tool is better for ESL researchers?

ProofreaderPro.ai supports more languages (50+ versus QuillBot's 33) and pairs paraphrasing with full proofreading to catch grammar issues that paraphrasing alone won't fix. For researchers writing in a second language, the combination of paraphrasing, proofreading, and tracked changes creates a stronger editing workflow than paraphrasing alone.

Q: Is ProofreaderPro.ai just a paraphrasing tool like QuillBot?

No. ProofreaderPro.ai is a full academic editing platform. Paraphrasing is one feature alongside AI proofreading, text humanization, summarization, translation, and tense conversion — all with tracked changes export. QuillBot focuses primarily on paraphrasing with a grammar checker as a secondary feature.