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Can You Use Grammarly In The Duolingo English Test (DET)?

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Lume Test
Published on: December 11, 2025

Grammarly seems to be a “best friend” for correcting your grammar mistakes.

Many students can’t resist the temptation to use this helpful tool, even during online tests like Duolingo.

Yet, you may think: Can I use Grammarly in the Duolingo English Test (DET)?

It’s good that this thought pops into your mind before starting your exam.

Let’s follow along with LUME to find out the answer!

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Key Takeaways

  • You can’t use Grammarly during the Duolingo English Test (DET). Doing so can lead to invalid results, suspension, or ban.
  • Besides Grammarly, AI Writing and translation tools are also prohibited.
  • You can disable those apps by clicking Quit for Mac or closing them on the Task Manager menu for Windows.
  • You can use Grammarly when practicing to improve your grammar. 
  • There are other resources to practice the Duolingo English Test (DET) without using Grammarly.

Can You Use Grammarly In The Duolingo English Test?

No. Grammarly and any other similar tools are not allowed during the Duolingo English Test (DET).

The purpose of this rule is to ensure you don’t get help from external sources, guaranteeing the test’s fairness.

Any attempt to use Grammarly will lead to an invalid result, account suspension, or permanent ban.

Steps To Disable Grammarly

Here’s how you can disable the Grammarly Desktop app if you have it installed on your computer:

For Windows

  • Open the Task Manager by using CTRL + SHIFT + ESC to check if the app is running.
  • You’ll see a list of active apps on top of the window.
  • Click on Grammarly and close it.

For Mac

  • Access the background apps by checking the top navigation bar.
  • Select the Grammarly icon and choose the option “Quit”.

Since Grammarly usually runs automatically when you start your computer, always double-check if it’s on again after restarting.

What Other Programs Need To Be Closed During DET?

Besides Grammarly, if you let the following programs run in the background, you could have violated the test’s rules.

Grammar Checkers (Grammarly, Quillbot, etc.)

All programs that can help you correct your grammar, spelling, structure, and punctuation are strictly prohibited from use during the Duolingo English Test (DET).

Using them will give you an unfair advantage over other candidates and affect the assessment.

The test’s result will not reflect your real English ability.

Having these tools active even in the background will trigger the screen monitoring system and security alert.

AI Writing Tools (ChatGPT, Claude, Wordtune, etc.)

The Duolingo English Test (DET) is designed to assess your language proficiency, not AI’s writing quality.

Thus, these AI tools are unauthorised assistance that you can’t have during the test.

The Duolingo app can detect this violation and invalidate your result.

Translation Tools (Google Translate, DeepL, Browser add-ons)

Using these tools during the test will affect the assessment of your comprehension and production skills.

A candidate may use Google Translate to understand the question and compose the answer, which is against the evaluation purpose of the Duolingo English Test (DET).

All of these translation tools need to be turned off before the test starts.

Screen Recording / Screenshot Tools

According to Duolingo’s test security policies, no screen recording or screenshot tools are allowed.

Candidates can’t either record or share the screen with others.

The best way is to uninstall all of these applications and reinstall them after the test is over.

Also, note that providing remote access to your computer is strictly prohibited, too.

Website / Browser Extensions That Auto-Suggest Words

These extensions can greatly assist you with writing, which goes against the test’s policy.

Only having them enabled without actively using them can trigger the security system.

Therefore, disable all of these extensions to ensure there’s no external influence during the testing process.

How To Close All Background Programs

Follow these steps to close all background programs before starting your Duolingo English Test (DET):

For Windows

  • Open the system taskbar tray.
  • Click on each running app to log out and close it entirely.
  • Another way is to use CTRL + SHIFT + ESC to open the Task Manager and select to close all apps except Duolingo.

For Mac

  • Go to your dock and select open apps, which are identified by a dot underneath them.
  • As you hold on to the icon, you’ll see a pop-up menu.
  • Select Quit to close the programs.

There’s another way: On your screen, navigate to the Apple icon in the top left corner. 

Then, tap Force Quit and choose all active programs to close them.

Can You Use Grammarly During Duolingo English Test (DET) Practice / Preparation?

You can choose to use Grammarly in your practice, depending on your needs.

You can use it for some time to understand your mistakes, and then gradually leave it.

The more you use the app, the more you’ll depend on it.

You need to get used to taking the test on your own without any external help.

Otherwise, you may feel overwhelmed when starting the real exam.

In the end, you can’t have a desirable result.

How To Use Grammarly The Right Way To Improve Your English

Grammarly is not for cheating, but a useful tool to improve your English, especially writing.

The main thing is you don’t correct your mistakes blindly, but review suggestions with understanding.

There might be grammar that you need to review to ensure you don’t make the same mistake a second time.

Instead of just accepting, you can dismiss suggestions that don’t fit your writing style.

Remember that Grammarly is not a complete solution.

You can combine it with other resources and exercise and practice every day to build up your English skills without reliance on any tool.

3 Tips To Be Confident In The Duolingo English Test (DET) Without Grammarly

Use The Official Duolingo English Test (DET) Practice Dashboard

Duolingo allows students to take free official practice tests that mimic the real exam.

This gives you a better understanding of the test’s format and timing. 

From that, you can learn how to give an answer 100% on your own words without relying on Grammarly.

The more you practice, the better you can show your true language ability under stressful conditions.

Practice Typing Speed And Accuracy Daily

Candidates need to practice this skill without the help of any extensions, so that they can type their responses correctly in a limited time.

If you frequently make typos, try to improve your accuracy first, and then speed.

You should practice writing in sentences or short paragraphs, rather than single words.

40-50 words per minute can be considered a good result.

Study Common DET Prompt Patterns

There are repeated types of prompts in the Duolingo English Test (DET).

You can study some common ones so that you can understand them quickly without the help of translation tools.

FAQs

Will You Get Banned If Grammarly Is Open?

Yes, opening or running Grammarly in the background while taking the Duolingo English Test (DET) can lead to a permanent ban, or at least, an uncertified result.

Can You Use Grammarly Keyboard On Mobile If I Take the Duolingo English Test (DET) On A Laptop?

No, it’s strictly prohibited.

Writing assistance tools are 100% unacceptable as they will affect the test’s fairness.

Can You Use Grammarly In The Duolingo Speaking Section?

No, you can’t.

Duolingo requires your answer to be 100% in your own words, no matter what section.

Using Grammarly will be against the test’s rules.

How Do You Show The Proctor That You Already Disabled Everything?

You can’t actively show the proctor anything, as Duolingo is an online test.

Yet, the AI system can flag potential issues, and human proctors will review the recorded video and decide your performance.

You have the responsibility to disable prohibited software before starting the test to avoid an unwanted invalid result.

Conclusion

Can You use Grammarly in the Duolingo English Test (DET)?

No, this tool is strictly prohibited.

Candidates must disable it before starting the test to ensure they don’t violate the rule.

You can use Grammarly for practice.

However, it’s always better to understand the suggestions rather than just blindly accept all corrections.

This way, you can have a deeper understanding and improve your language effectively.

Related practice resources

Want to ACE the Duolingo English Test (DET) And Reach Your Goals?

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✅ 10,000+ PRACTICE QUESTIONS with detailed answers

✅ FREE MOCK TESTS with fast & accurate AI scoring

✅ Get BETTER SCORES with a PERSONALIZED study plan

GET YOUR FREE ACCOUNT NOW

(Limited seats available!)

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Lume Test is a leading platform offering practice questions and mock tests for major English exams like PTE, IELTS, TOEIC, Duolingo English Test, and more. We provide up-to-date, comprehensive materials designed to help learners improve their language skills and achieve high scores. With expert-crafted tests that closely mirror real exam formats, Lume Test ensures you're fully prepared for success. Your goals are our mission!

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