ProofreaderPro.ai vs Grammarly: Which Is Better for Academic Writing?

Grammarly has over 30 million daily users. It's the writing assistant your advisor has heard of, the one your university might even recommend. So when we say there's a better option for academic writing, we know that's a bold claim.

We tested both tools on 40 academic manuscripts spanning biomedical sciences, computational linguistics, environmental policy, and economics. We ran the same texts through Grammarly Premium and ProofreaderPro.ai, then had two experienced editors score the outputs blind. The results surprised us — and they'll probably surprise you too.

The feature comparison at a glance

The table tells one story. The details tell a richer one.

Where Grammarly wins — and it does win

We're not going to pretend Grammarly doesn't have real advantages. It does. If we ignored them, you wouldn't trust anything else we say.

The browser extension changes everything. Grammarly works inside Gmail, Google Docs, LinkedIn, Slack — basically anywhere you type in a browser. You don't copy-paste text into a separate editor. Your corrections appear in real time, right where you're writing. For everyday email and quick documents, this is genuinely hard to beat.

Brand recognition matters. When a journal reviewer says "use a grammar checker," they probably mean Grammarly. When your department offers writing tool discounts, Grammarly is likely on the list. That institutional trust took years to build.

Business writing is Grammarly's home turf. Tone detection, formality adjustments, conciseness suggestions — these features shine in corporate emails and reports. If you split your time between academic papers and administrative writing, Grammarly covers the non-academic half well.

The free Chrome extension is actually useful. Even without paying, you get basic grammar and spelling corrections everywhere you type. For casual use, that's enough.

Where ProofreaderPro.ai wins for academic work

Here's where the comparison gets interesting for researchers specifically.

Tracked changes are non-negotiable in academia. Your advisor wants to see what changed. Your co-author needs to approve edits. Journal copyeditors expect Word tracked changes. Grammarly gives you corrected text — take it or leave it. ProofreaderPro.ai exports a .docx file where every single edit appears as a tracked change you can accept or reject individually. We've talked to dozens of researchers who call this the feature that made them switch.

Citation formatting stays intact. We ran a methods section heavy with in-text citations through both tools. Grammarly flagged "(Smith et al., 2024)" as a sentence fragment in three separate instances. It suggested removing the comma in APA-formatted citations. ProofreaderPro.ai recognized every citation format — APA, MLA, Chicago, IEEE — and left them untouched. If you've ever had to re-fix citations after a grammar tool mangled them, you know why this matters.

AI text humanization is built in. If you've used ChatGPT to help draft sections — and nearly half of graduate students now do, according to a 2025 Nature survey — your text might trigger AI detection tools. ProofreaderPro.ai includes a text humanizer that restructures AI-generated passages to read naturally. Grammarly has nothing comparable.

Tense conversion saves hours. Switching your methods section from present to past tense — or vice versa — is tedious manual work. ProofreaderPro.ai handles it automatically. Grammarly doesn't offer this.

Fifty-plus languages make it accessible. Non-native English speakers represent the majority of academic authors worldwide. ProofreaderPro.ai works in over 50 languages for paraphrasing and editing. Grammarly supports English only.

What we found in blind testing

We gave our two editors 10 manuscripts — each processed by both tools — and asked them to rate grammar accuracy, citation handling, academic tone preservation, and overall output quality on a 1–10 scale.

For pure grammar correction, both tools scored within one point of each other. Grammarly averaged 8.2; ProofreaderPro.ai averaged 8.4. The difference was negligible.

The gap appeared in academic-specific tasks. Citation handling: Grammarly scored 5.1 (it actively introduced citation errors), while ProofreaderPro.ai scored 9.3. Tone preservation: Grammarly occasionally shifted formal academic prose toward conversational — scoring 6.8. ProofreaderPro.ai maintained the original register, scoring 8.9.

Grammar alone isn't enough for academic papers. Your tool needs to understand that academic writing has rules Grammarly wasn't trained on.

Pricing: the gap is wider than you think

Grammarly Premium costs $12/month on the annual plan. If you pay monthly, it's $30. Grammarly Business is $15/member/month. The free tier covers only basic spelling and grammar — no style suggestions, no tone detection, no rewrites.

ProofreaderPro.ai costs $5 for your first month, then $10/month. The free tier includes 5,000 words/month with all features unlocked — tracked changes, citation preservation, humanization, everything.

Over a four-year PhD, that's roughly $480 for Grammarly Premium versus $475 for ProofreaderPro.ai. The cost is comparable, but ProofreaderPro.ai includes features that Grammarly charges extra for or simply doesn't offer. The real value difference is in what you get for your money.

For students on a stipend, the free tier comparison is even more telling. ProofreaderPro.ai's free plan can handle a short paper each month. Grammarly's free plan tells you that you have errors but won't always tell you what they are unless you upgrade.

Real workflow differences

The way you actually use these tools day-to-day matters as much as their feature lists.

With Grammarly, you write in your browser or desktop app and see corrections in real time. It's passive — always there, always suggesting. For some people, that's ideal. For others, it's distracting during the drafting phase.

With ProofreaderPro.ai, you finish your draft, then upload or paste your text for a focused editing pass. You get a tracked changes document back. You review each edit deliberately. This mirrors how professional editing works — draft first, edit second.

Neither workflow is objectively better. But if you're writing a 30-page thesis chapter, the focused-editing approach tends to produce cleaner results. You're not chasing green underlines while trying to construct an argument.

Our recommendation

Choose Grammarly if your writing is mostly emails, reports, and non-academic documents. The browser extension is unmatched for everyday writing across platforms. If you occasionally write academic papers but your primary need is business communication, Grammarly makes more sense.

Choose ProofreaderPro.ai if you're a researcher, graduate student, or academic professional whose primary output is research papers, theses, or dissertations. The tracked changes export, citation preservation, AI humanization, multilingual support, and lower price make it the stronger choice for academic work. Start with the AI proofreader and see the difference yourself.

Choose both if you write frequently across academic and non-academic contexts. Use Grammarly's extension for email and admin writing. Use ProofreaderPro.ai for your manuscripts and thesis chapters. There's no rule that says you can only use one tool.

See the Full AI Proofreader

Three editing depths, tracked changes, citation-aware corrections, and 50+ languages. Built for academic writing.

Frequently asked questions

Q: Can Grammarly handle academic citation formats like APA and IEEE?

Grammarly has limited awareness of citation formats. In our testing, it flagged properly formatted APA in-text citations as errors in roughly 30% of cases — suggesting comma removals, sentence restructuring, or fragment corrections. ProofreaderPro.ai is specifically trained on APA, MLA, Chicago, IEEE, and Turabian formats and preserves them during editing.

Q: Is Grammarly's free version enough for academic papers?

Grammarly's free tier catches basic spelling and grammar errors, but it misses style-level issues, doesn't offer rewrites, and provides no tracked changes export. For a quick proofread of an email, it's fine. For a journal submission, you'll need either Grammarly Premium or an academic-focused alternative. ProofreaderPro.ai's free tier includes all features up to 5,000 words/month.

Q: Does ProofreaderPro.ai work inside Google Docs like Grammarly does?

Not currently. ProofreaderPro.ai is a dedicated editing platform — you paste or upload your text, then download the edited version with tracked changes. This is a deliberate design choice that supports the tracked-changes workflow academics need. If you want inline corrections while typing, Grammarly's browser extension is better suited.

Q: Which tool is better for ESL researchers writing in English?

ProofreaderPro.ai has a clear advantage here. It supports 50+ languages for paraphrasing and editing, handles common ESL error patterns more precisely, and its tracked changes export lets non-native speakers learn from each correction. Grammarly supports English only and sometimes flags grammatically correct ESL phrasing as errors when it's simply unfamiliar with certain academic registers.