Grammarly AI Detector Review for 2025 | Is It Really Accurate?

If you too are associated with the writing or publishing industry like me, then you must have heard the name of Grammarly Tool at some time or the other because it has been available in the market from quite a long time and someone must have used it till now, let us today understand the accuracy of the features of this tool in detail, basically Grammarly has been a go-to tool for writers, students, and professionals looking to refine their writing. Over the years, it has evolved into more than just a grammar-checking software, incorporating AI-powered features like content generation and plagiarism detection. But how does its AI detector perform? Many of my friends had this doubt whether it can really detect AI written content accurately and you might not necessarily have the same idea in your mind, so let’s try to find the answer.

In this review, we’ll explore Grammarly’s AI detector, its accuracy, and how it compares to other AI detection tools. We’ve conducted real-world tests with ChatGPT-generated content to evaluate its effectiveness. So if you also want to expand your writing career and knowledge further, stay with us till the end of this blog.

Quick Summary

Grammarly’s AI detector is a recent addition aimed at identifying AI-generated content. And in the recent years many more features have been added to it.

While it provides general insights, it’s not always accurate, so you may have to check it manually.

Other AI detectors like AssignmentGPT have shown better precision, in many of our tests AssignmentGPT performed better than other tools specially Grammarly.

According to our team's review Grammarly remains an excellent tool for grammar, spelling, and readability but shouldn't be relied upon solely for AI detection. And why did we say this, you will get the answer in the next paragraphs.

What is Grammarly?

Grammarly is a cloud-based writing assistant that helps users improve their writing by checking for grammar errors, spelling mistakes, clarity issues, and now, AI-generated content. And Grammarly available as a browser extension, desktop app, and mobile app, Grammarly has become a widely-used tool across various platforms, including Google Docs, Microsoft Word, and email clients. Maximum users, whether they are Android users or desktop users, will use Grammarly to fix grammar mistakes.

In 2025, Grammarly has introduced AI detection as part of its expanding feature set. But does it work as intended? You will get the answer from our detailed tests.

Why Do People Like Grammarly's AI Detector?

1. People use Grammarly’s AI detector for various reasons:

2. It’s easy to use and built into the Grammarly interface, and people use Grammarly mostly because they have been using its grammar mistake-fixing feature for a long time, so they find its interface simple.

3. It helps content creators verify whether AI-generated text is detectable.

4. It integrates seamlessly with Grammarly’s other writing improvement tools, People trust Grammarly more because it already has features like Plagiarism detection, Grammar fix.

5. However, one key question remains: Is it accurate? And this question also came to my and my team’s mind.

Popular Features of Grammarly

Grammarly offers a variety of features beyond AI detection, including:

1. Grammar & Spelling Checker – Most people who know Grammarly know this tool as a grammar and mistake checker tool.

2. Readability & Clarity Enhancer – It suggests improvements for better engagement, this tool is especially useful for content writers.

3. Plagiarism Checker – It also has features like Plagiarism tools, in which it scans billions of web pages for duplicate content.

4. Tone Adjustments – Ensures content aligns with the intended audience. It also makes tone adjustments of content subject wise, just as content is a science, it also keeps its written tone as a science.

5. Generative AI Writing (GrammarlyGO) – This tool helps users with content creation, meaning you can also generate content with it.

Despite its strengths, Grammarly’s AI detector has need for improvements, and why we say so is the answer you will find later in this blog.

Pros and Cons of Grammarly

Pros

1. This tool is easy to use across multiple platforms, whether you want to use it on your phone, desktop or as an extension, it is compatible everywhere.

2. This tool provides real-time suggestions for grammar, clarity, and style.

3. It includes a built-in plagiarism checker.

4. AI-powered rewriting and content enhancement tools. When all these tools are available on a single platform, the efficiency of the user increases as one does not have to switch between different tools again and again.

Cons

1. Grammarly's AI detection is not 100% accurate, as it often shows AI content as human content.

2. Sometimes marks human-written content as AI-generated.

3. More expensive than some alternatives, you get many more tools in this but users who want to use it only for the AI detection feature may find it expensive.

4. Users do not get offline mode in this, which means whether you use it on the phone or in the browser, you will need a good internet connection to use it.

Grammarly Pricing in 2025

Grammarly offers basically 3 plans to its users:

• Free Plan – Basic grammar and spell-checking, in this you can download the Grammarly application on your phone or install an extension in your browser or use it for free through their website but you get limited features per day.

• Grammarly Pro ($12/month) – Includes plagiarism detection and AI-powered writing tools, if you are a content writer then these features can prove useful for you.

• Grammarly Business ($15/month per user)– Advanced team collaboration features, if you have a team and you want all your teams to use Grammarly features, then this plan can prove good for you.

For those specifically looking for AI detection, other tools might be more accurate.

Use Cases for Grammarly

Grammarly tool is used for many purposes, but primary uses are for writing.

1. Students – Many students use this tool to check assignments for grammar and plagiarism. Students from school to college use it.

2. Content Creators – Many social media creators and specially content creators use this tool to refine blog posts and social media content.

3. Professionals – It is also used for many business purposes to improve clarity in business communications, like to set the tone of a presentation in business or to write a professional email.

4. Marketers – Many different types of marketers also use it to ensure polished and engaging ad copy. Whether a marketer is marketing online or offline, he definitely uses Grammarly.

However, if AI detection is your primary concern, Grammarly may not be the best tool, as many times you may have to do manual check for accuracy.

Testing Grammarly’s AI Detector with ChatGPT Content

To test the accuracy of Grammarly AI detection tool, we will do 2 real tests, in which we will generate content from ChatGPT and use Grammarly AI detection and other AI detection tools and try to check its accuracy to detect Ai generated content.

Sample 1: AI-Generated Blog on Social Media

We generated a blog using ChatGPT.

After this our team has checked it in AssignmentGPT AI Detector – Result: 100% AI content.

Then we Checked it in the Grammarly AI Detector – Result: 60% AI, 40% Human.

From the first test we found that the accuracy of Grammarly AI detection is quite low compared to AssignmentGPT AI detector.

Sample 2: AI-Generated White Paper on Social Media Risks

Generated a white paper using ChatGPT.

After this we checked it in AssignmentGPT AI Detector – Result: 100% AI content.

Checked it in Grammarly AI Detector – which Result: 40% AI, 60% Human.

Again, Grammarly’s detector was less precise than AssignmentGPT.

Alternatives & Competitors to Grammarly

If AI detection is your main task or if you don’t like the Grammarly AI detection tool, you can try some of the following better alternatives:

1. AssignmentGPT AI Detector: As seen in our tests, AssignmentGPT detection is more accurate in detecting AI-generated content compared to Grammarly AI detection. Our team also liked it because it provides a clear breakdown of AI vs. human-written text.

2. QuillBot: Maximum people know the Quillbot tool for paraphrasing and text improvement. But it includes a grammar checker but lacks AI detection. There are times when it can mistake human-written content for AI.

3. Copyleaks: This tool is strong in AI detection and plagiarism-checking capabilities. This log is used for academic institutions and publishers. If you want to use AI detection feature in your professional work then Copyleaks can be your best option.

4. Writer AI: This tool is advanced in AI-powered content editing and detection tools. It is designed for enterprise-level content management.

5. Scribbr: Mostly bloggers model's use of this tool is in Academic-focused AI detection related work. This tool is ideal for students and researchers.

Conclusion

Grammarly is a great tool for grammar and readability, but from our team's tests and my personal experience its AI detector is not the most reliable. Our tests showed that AssignmentGPT AI Detector performed better in identifying AI-generated content.

Grammarly’s AI detection is a work in progress, and while it provides some insights, it shouldn’t be solely relied upon for verifying AI-generated content. Even if you are using Grammarly AI detection tool, it is very important to have knowledge of your content writing, so that you can do manual checks.

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