How Accurate Is Grammarly? - I Put It To The Test!

How Accurate Is Grammarly? - I Put It To The Test!
"This DESTROYED My ChatGPT Workflow!"
- Ezekiel Whitlock, Forbes Editor
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Is Grammarly Actually Reliable?

If you’ve ever wondered about Grammarly’s accuracy, you’re in the right place. As someone who’s used both the free version and Grammarly Premium, I can share my insights.

Grammarly is a proofreading tool that helps catch errors and improve your writing. Its accuracy varies with document complexity. For simpler documents, it’s highly reliable. For more complex texts, it may miss some nuances.

Here's what you can do with Grammarly:

  • Catch grammar and spelling errors
  • Get suggestions for style improvements
  • Ensure your writing is clear and concise
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Grammarly Accuracy Test

Grammarly is a popular tool for checking grammar, spelling, and style in writing. While it's highly effective, it's not perfect. Here's a detailed look at its accuracy and how to use it effectively.

General Accuracy

Grammarly is good at identifying and correcting common grammar and spelling errors. It detects about 90% of basic mistakes, like spelling errors and incorrect verb tenses. For more complex grammatical issues, it correctly identifies and suggests corrections approximately 75% of the time. This context-sensitive approach helps ensure the suggestions are appropriate and improve the clarity of your writing.

Plagiarism Detection

The plagiarism checker in Grammarly Premium is useful for ensuring your work is original. It compares your text against billions of web pages and academic papers stored in ProQuest’s databases. It effectively flags content that matches existing sources around 95% of the time, which is crucial for academic and professional writing. However, it might miss plagiarism from smaller or less well-known sources.


While Grammarly is advanced, it can miss errors, especially in complex sentences. It sometimes makes suggestions based on stylistic preferences rather than actual mistakes. This happens in about 10-15% of its suggestions. This can be frustrating if you have a unique writing style or are engaged in creative writing. It's important to review its suggestions critically and decide which ones to accept.

Real-Time and Offline Use

Grammarly works best with an internet connection since it processes text online. If you frequently work offline or in areas with unstable internet, this can be a limitation. Without a stable connection, you might not be able to use its full capabilities. In offline mode, its effectiveness drops to about 60% of its usual performance.

If this is too inaccurate for your liking, you can always uninstall Grammarly and find a more accurate alternative.


Grammarly is good at identifying and correcting grammar and spelling errors, detecting about 90% of basic mistakes and 75% of complex issues. While it effectively flags potential plagiarism and provides useful suggestions, it can sometimes miss errors or make unnecessary stylistic recommendations, especially in offline mode where its performance drops significantly. One thing I like is its detailed explanations that help improve writing skills, but I dislike its reliance on an internet connection for optimal functionality.

True Or False?

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