Grammarly Plagiarism Checker Review:
based on real mystery shopping

A*Help Score: 53.5/100
🔥 published August 9, 2023 - updated May 20, 2024

Grammarly, a well-known grammar-checking platform, delivers spelling correction across all types of texts and offers to improve the style and general sound of writing. Additionally, it provides users with a plagiarism detection tool, leading to comparisons like Grammarly plagiarism checker vs Turnitin. As we found during our tests, Grammarly is a good option for spell-checking and proofreading, but when it comes to plagiarism detection, it may not perform as comprehensively as services specifically designed for that purpose, such as Turnitin.

TOP services Our verdict AHelp Score 🔥 Updated January 2024
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AHelp Plagcheck
Best plagiarism detector 86.5/100 Get free access
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Best experience 86/100 Read review
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Best features 85.1/100 Read review
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Originality AI
Best free trial value 79.1/100 Read review
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Best price 78.6/100 Read review


🌟 A*Help score53.5/100
✅ Quality of Help21.5/50
💲 Price$30

The plagiarism detection tool on Grammarly’s platform didn’t have too many features to offer. Nonetheless, it was easy to use and also could identify different sources of texts, mainly from the Internet and its own database. The detection process, still, wasn’t very productive. The service could only successfully find the 100% original text and missed it in all other cases. 
⚖️ Our verdictGrammarly’s plagiarism detection tool doesn’t work well in proving the originality of the content

Grammarly Plagchecker’s Quick Overview

Grammarly is a familiar tool for every student. It’s a true lifesaver when it comes to battling spelling and grammar. But it also promises to be the best plagiarism checker for students in protecting academic integrity. AcademicHelp tried its plagiarism checker feature and we can say that it needs a lot of improvement in order to be truly beneficial to everyone in the education field.  See How We Test Plagiarism Checkers for more details about our testing approach.

The Good
  • Budget-friendly prices
  • A great number of basic features
  • Accessible website
The Bad
  • Inaccurate plagiarism quality detection
  • No free plans
An infographic with a short Grammarly plagiarism detector review describing the ways it was tested and how it received an A*Help Score: 53.5/100
Grammarly plagiarism checker on the screen of a laptop

Grammarly’s Plagiarism Detection quality — 21.5/50 ⭐️⭐️

Grammarly’s plagiarism checker demonstrated high efficiency in identifying 100% of the plagiarism in human-written texts. However, its performance was disappointing when it came to detecting content plagiarized from the internet and AI-paraphrased texts, with only 3% and 19.5% detection rates, respectively. The service also failed to flag any character modifications as plagiarized content. These results suggest that while Grammarly can be reliable for checking originality against human-produced content, it struggles significantly with more sophisticated plagiarism tactics, including AI-generated and heavily modified texts.

> Text> Best result> Acceptable result> Grammarly result
Human-written text100% free of plagiarism10% margin of error100% free
Internet sample100% plagiarism detected10% margin of error3% detected
AI paraphrase (2 texts)100% free of plagiarism10% margin of error19.5% plagiarism detected
Replaced characters100% plagiarism detectedFlagged character replacements0% plagiarism detected
No flags or alerts

Grammarly’s Plagcheck: Value for Money — 14/25 ⭐️⭐️⭐️

Grammarly’s plagiarism checker offers a straightforward, albeit limited, set of features, focusing mainly on spelling and grammar checks alongside basic plagiarism detection. The absence of many advanced features and a free trial limits its appeal, especially for users seeking comprehensive text analysis tools. However, the service is priced affordably, with several subscription options and discounts for paid plans, making it an accessible option for users prioritizing grammar and basic plagiarism checks over in-depth analysis.

Basic features
Price & special offers

Grammarly’s Plagcheck: Overall Experience — 18/25 ⭐️⭐️⭐️⭐️

The overall user experience with Grammarly’s plagiarism checker is generally positive, thanks to its easy-to-use website and desktop application. The absence of a browser extension for plagiarism checks slightly diminishes its accessibility, but the platform compensates with a quick checking process and support for third-party registration methods. However, the lack of onboarding support and a support chat may leave some users looking for more guidance in navigating the service.

User experience & registration
Grammarly’s Overall Experience — 18/25


Grammarly’s plagiarism checker, while user-friendly and affordable, falls short of providing a comprehensive solution for detecting plagiarism, particularly from online sources and AI-paraphrased content. Its strengths lie in grammar and spelling checks, alongside efficient detection of human-written plagiarism, making it suitable for users with basic plagiarism checking needs. However, those requiring more robust detection capabilities, especially educators and professionals, might find the service lacking in depth and breadth of features.


Grammarly Reviews

Our team at AcademicHelp always reviews services before recommending them. We read user reviews on sites like TrustPilot,, Sitejabber, and Reddit for real feedback. This information forms the basis for our mystery shopping and our Negativity Rank.

Is Grammarly a Scam?

After testing Grammarly with five different texts, we can confirm it’s not a scam. It’s easy to use and quickly scans texts. Our team received results for each essay we checked, so it’s a reliable service.

Is Grammarly Legit?

Yes, Grammarly is a legitimate plagiarism checker. Our mystery shopping found no suspicious activities, so we can confidently say it’s a legit tool.

Is Grammarly Safe?

We used Grammarly to scan five essays. But before we could do this vital step we had to create an account and pay for the subscription. We found this plagiarism checker to be safe and secure. In short, there were no fraudulent activities.

Is Grammarly Trustworthy?

Yes, Grammarly is a trustworthy service for students to check for plagiarism and writing. Many users regularly use it. And you might be the one who is a devoted user of Grammarly. Our mystery shopping confirms it’s a reliable service.

Is Grammarly a Good Service?

After testing Grammarly with five essays, we gave it a score of 52.75 out of 100 points. This score reflects not just the quality of plagiarism detection but also the cost-effectiveness and overall user experience. However, the quality of checkups leaves much to be desired.

Grammarly’s Plagcheck Specs

> Features
Check files
Insert text
Scanned report
Word limit
Academic proofreading module (check citations and etc)
Check for free/trial
Number of free checks available
Spelling check
Grammar check
> Advanced features
Detect AI content
Cross language search
Text compare
OCR scan
> Sources
Current Batch Files (your own docs)
Plagchecker’s database
> Trial & special offers
Paid plansAffordable
> User experience
Easy to use website
Desktop version
Trying before registration
Browser extensions
Account (do users have an account?)
Time to check worka couple of seconds
Need email to register
Need phone to register
Third-party registration methods
> Support
Onboarding (how to use plagcheck)
Support chat
> Payment
Wallets (only Paypal)

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