9 Most Accurate AI Plagiarism Checkers in 2024 (Tested & Results)

Choosing the best AI plagiarism checker is like having a powerful detector to help you find out if your content is original or not. Despite the rapid development of the AI industry, authentic materials are still treasures in the audience’s eyes. If you are looking for a suitable tool to help you make sure your content is not copied, here are 9+ options TechDictionary wants to bring you. Let’s dive deeper into them now!

Our process for comparing checkers

Finding the best AI plagiarism checker is not easy. We conduct in-depth research into all aspects of those tools, unearthing their features, pros and cons, or prices to complete a comprehensive view and reach an accurate conclusion.

For more details, we analyze the following factors:

• Capability of accessing the database
• Highest quality of matches
• Ability to work effectively for the most source types.
• It is possible to detect plagiarism when the original text has been altered.

By the end of this article, we will show you the incredible results of using these AI plagiarism detectors for the same paragraph. Let’s come and see!

9 Best AI Plagiarism Checkers in 2024: Fast & AC (We Tested Most Of Them)

Now is the most anticipated part of this article. Before diving deeper into each one, you should take a glance at the Best Plagiarism Checkers Compared Table:

Top AI Plagiarism checker	Rating	Free Plan	Limitations
Scribbr	4.6/5	No	No full report in the free version
Grammarly	4.5/5	No	No full report in the free version
Originality AI	3.9/5	Yes	3 free daily scans with a limit of 300 words each
PlagAware	3.7/5	No	Trial of 10 pages
QuillBot	3.4/5	No	A free account can only paraphrase 125 words at a time
Copyleaks	3.4/5	Yes	Trial of 2,500 words
PrepostSEO	3.2/5	Yes	1,000 words/check; 30 search queries (sentences)/month
Crossplag	2.9/5	Yes	A free version limits users to 1,000 words per scan
GPTZero	2.2/5	Yes	50,000 character limit per document

*The trusted source of these figures is Trustpilot.

1. Scribbr (in partnership with Turnitin)

Scribbr is currently in partnership with Turnitin, which is one of the best AI plagiarism checkers that students should not miss. Scribbr is an online platform that helps students improve their papers by offering writing and grammar suggestions and checking for plagiarism in their materials.

Because of the partnership with Turnitin, a tool for students, you have to sign up and upgrade your plan to use it. Which is pretty much a big cons for us.

Key Features: 

Scribbr has so many incredible features that make it stand out from many online platforms out there. Here are some highlight features of this checker you can refer to:

• Online plagiarism checker
• Editing and proofreading services
• Citation and reference formatting

Pros & Cons:

Pros	Cons
✅ Your documents are not sold to a third party. ✅ Offer post-sale guarantee and support service. ✅ A free version is available. ✅ Detects plagiarism with high accuracy. ✅ Offer to check for self-plagiarism	❌ The quality you receive depends on the price you pay. ❌ Only the premium version has all the features and sends you a full report.

Pricing:

Sadly, Scribbr does not offer a plagiarism feature when you use a free version, so you need to upgrade to experience it. However, if you want to make sure of this tool’s effectiveness, you can see its demo first.

The premium range has these packages with the following prices:

• Small document (up to 7,500 words): $19.95
• Normal document (7,500-50,000 words): $29.95
• Large document (50,000+ words): $39.95

2. Originality AI – Most Accurate AI & Plagiarism Checker

You absolutely cannot overlook the Originality AI tool if you’re seeking an exceptional solution to detect plagiarism in your content. Exactly! Originality AI is not only a plagiarism checker, but it is also an AI detector, a fact checker, and a readability checker as well. This all-in-one product can help you make your content unique, simple, and engaging.

Furthermore, Originality AI can root out plagiarism content with the highest accuracy rate, up to 90%. We also use a fact-checker to double-check the correction of all information we use. We love this feature! All of the incredible things that Originality AI collects and brings to users can help us affirm our content’s quality—the highest authentic level.

Key Features:

Don’t ignore these significant features the Orgininalty AI brings you:

• A plagiarism detector
• Fact-checking aid
• Readability checker
• Reveal AI-generated content
• Have a Chrome extension

Pros & cons:

Pros	Cons
✅The price is lower than the competitors ✅It checks both plagiarism and AI-generated content. ✅SEO-friendly ✅Lower cost for high-quality content ✅Easy to use	❌No more details in readability feedback

Pricing:

There are two pricing options available: pay-as-you-go and base subscription. Here are the details:

• The pay-as-you-go option is $30 and includes 3,000 credits
• The base subscription is $14.95/month and comes with 2,000 monthly credits.

3. Grammarly

Grammarly is one of the AI writing assistants that can help you have a leisurely writing life. It helps you detect grammar, punctuation, and word choice, and especially check the plagiarism of your content. If you are looking for a comprehensive AI tool for writing, we highly recommend Grammarly for you.

Key Features:

Let’s find out some key features of Grammarly as below:

• Plagiarism checker
• Customize for your writing needs
• Seamless multi-platform integration
• Style and tone suggestion
• Real-time grammar and punctuation checking.

Pros & cons:

Pros	Cons
✅Easy to use ✅Diversity of writing style (informative, formal, informal, funny, etc.) ✅Browser extension is active so it can be integrated with other platforms. ✅Real-time spell and grammar check. ✅Suitable for all sorts of writers. ✅Work great as a writing assistant.	❌Plagiarism checker is only active on the premium version. ❌Limitation on document import (up to 4 MB and 100,000 characters) ❌No many features with the free version.

Pricing:

Like other AI tools, Grammarly also offers a free version, but a plagiarism checker is only permitted on the premium. You can check the price of each package below:

• Monthly package: $30
• Quarterly package: $20/month
• Annual package: $12/month

4. PlagAware

PlagAware is another effective plagiarism detector that helps writers check if their content is original or copied. This tool is the best choice for students because it can ensure the integrity of academic work.

Key Features:

If you dive deeper into PlagAware Checker, don’t overlook these key features:

• Plagiarism and spell checker.
• Text monitoring.
• Citation assistance.
• Double content check
• Multi-language support
• Data security.

Pros & cons:

Pros	Cons
✅The percentage of content detected is pretty high. ✅Privacy protection ✅The dashboard contains more helpful information for you to analyze	❌Difficult to read PDF reports. ❌No Free Plan

Pricing:

There are four packages for PlagAware pricing:

• Package S: $15 (100 pages)
• Package M: $30 (250 pages)
• Package L: $47 (500 pages)
• Package XL: $107 (1500 pages)

Sadly, PlagAware does not open a free version for users, but it offers 10 free credits when users buy 100 credits. This is a good way to help you save money if you usually use PlagAware for your studying.

5. QuillBot

Next, We want to talk about QuillBot. This tool is not strange for anyone at all, right? QuillBot is a good writing assistant that can help you reword and rewrite sentences and paragraphs. Besides, it is still a plagiarism checker, but this is not the strongest selling point of it. You can use QuillBot to enhance the quality of your content and improve your writing skills by suggesting more natural language.

Key Features:

Check out the outstanding features of QuillBot here:

• The strongest point of QuillBot is an excellent paraphrase.
• Plagiarism checker
• The grammar checker
• Citation generator
• The summarizer

Pros & cons:

Pros	Cons
✅Money-back guarantee. ✅Save your writing time ✅Pharaphrasing can enhance the quality of content ✅User- friendly interface ✅Seven different paraphrasing models	❌Limitations of the free version ❌Plagiarism is only active on the premium version.

Pricing:

With the plagiarism feature, QuillBot only offers it with the premium version. This version is available with unlimited words and access to more tones. The price is charged every month or every year.

• $19.95/mo
• $99.95/year

6. Copyleaks 

Copyleaks is the next plagiarism detector you should not ignore. This tool provides incredible results for checking plagiarism. Copyleaks is also super helpful for students who want to make sure their pieces of paper are as original as can be.

Key Features:

Copyleaks has many incredible features; here are some typical:

• Plagiarism detection, of course
• Simple AI-detection interface
• Retain the original intent.
• Produced SEO-friendly content.
• Work in a variety of languages

Pros & cons:

Pros	Cons
✅Analyze content in various source ✅Offer an advanced option for cross-language search ✅Easy to use ✅Active customer support	❌The accuracy may be false sometimes ❌The use of credits depending on the number of words

Pricing:

Pricing is also a headache for everyone when they decide to buy something. Copyleaks packs their service into many small packages you can refer to:

• 100 Pages (25K Words): $10.99/mo (Free 20 pages/mo)
• 500 Pages (62.5K Words): $40.99/mo (Free 20 pages/mo)
• 1,000 Pages (125K Words): $75.99/mo (Free 20 pages/mo)
• 10,000+ Pages (2.5M Words): Custom (Free 20 pages/mo)

7. PrepostSEO

PrepostSEO is another name for checking plagiarism. This tool’s biggest goal is to help you create unique content for all sorts of pieces. It attempts to become a versatile tool that can assist content creators and SEO professionals in optimizing SEO-friendly content.

Key Features:

Let’s take note of some highlight features of PrepostSEO:

• It’s a great plagiarism checker.
• It’s also a grammar checker.
• A paraphrasing tool
• Domain authority checker
• Text summarizer.

Pros & cons:

Pros	Cons
✅Affordable pricing ✅Free version does not require registration. ✅Large query limit per month. ✅Money-back guarantee. ✅Minimalistic and user-friendly UI ✅Many free features	❌Free version contains many ads. ❌Limited searches for signed-up users ❌A free version of this plagiarism checker offers a small word limit.

Pricing:

About Prepost SEO pricing, it charges every month or every year. Let’s check the details below:

• Monthly:
  • Basic: $10/mo
  • Standard: $20/mo
  • Company: $45/mo

• Annually
  • Basic: $50/mo
  • Standard: $150/mo
  • Company: $350/mo

8. Crossplag

Crossplag is a name suitable for students or educational researchers. Its database stores nearly 100 billion other Internet records, so if your content is copied from other sources, that part is automatically highlighted in red. This tool is also famous in many universities.

Key Features:

Some key features of Crossplag are:

• The accuracy rate is pretty high compared to other tools (~95%)
• User-friendly
• Fast processing

Pros & Cons:

Pros	Cons
✅User-friendly interface ✅Offers both plagiarism and AI detector ✅Has multilingual support ✅High accuracy rate ✅Free and versatile pricing options	❌Has a text limit for free users ❌Sometimes it delivers errors or less reliable results ❌Limited URL scanning ❌Does not offer simultaneous plagiarism scanning

Pricing:

Crossplag offers two pricing options, as follows:

• Free Plan: Monthly/Yearly Price: $0
• Basic Plan:
  • Monthly Price: $9.99
  • Yearly Price: $99.99 (nearly 16% savings compared to monthly billing)

9. GPTZero

The last one on the list is GPTZero. GPTZero detects plagiarism by matching your text to millions of documents in its databases and on the internet.

Key Features:

GPTZero is also a great plagiarism checker with many outstanding features, for instance:

• Detect plagiarism
• Improve with AI tutor
• Scan top AI models
• Verify real writing

Pros & Cons:

Pros	Cons
✅Advanced-data security ✅Deep scan features ✅Color-coded reportings ✅Human writing verification	❌Plagiarism checker is not available on the free version ❌Does not save scans, so it is difficult to share

Pricing:

Some packages of pricing that GPTZero offers for you:

• Annual plan:
  • Essential: $10/mo billed annually
  • Premium: $16/mo billed annually
  • Professional: $23/mo billed annually
• Monthly plan:
  • Essential: $15/mo
  • Premium:$24/mo
  • Professional:$35/mo

How We Test The Identify Plagiarism Of AI Detectors

It’s an interesting time! We copy a paragraph on Google search and start testing with all the tools above. Let’s check the results right now!

Here is a random paragraph from a random website on the internet (WordLift):

“The rapid proliferation of AI-generated content, especially since the recent introduction of ChatGPT in November, has underscored the importance of verifying the authenticity of digital content. This verification is crucial for companies and other institutions to determine whether a piece of content was created by a human or with the assistance of AI tools. Furthermore, digital marketers and SEO professionals must ensure that Google accurately indexes a website’s content, maintaining its visibility and relevance in search results.

In response to these challenges, a variety of tools have emerged, designed to detect AI-generated content and check for plagiarism. These tools serve as essential resources for safeguarding the integrity of digital content and protecting intellectual property rights. In this article, we will introduce you to some of these pivotal tools, offering insights into their capabilities and applications.”

Since Scribbr, Turnitin, and PlagAware are designed for educational use (requiring students, teachers, and educational organizations to access), we only test against other AI detectors listed in this article.

Now, let’s check out the results:

What are your thoughts on these results? The answer is quite evident, isn’t it? The results from those AI detectors are very similar. However, Originality AI stands out because it provides detailed information, sources, and website addresses where your content has been copied. It’s important to improve the authenticity and quality of your content based on this evidence. Additionally, this tool can help verify the accuracy of the information, figures, and details you use.

Score big with the Originality AI tool! Sign up now for a trial and experience its perfect performance for yourself.

How to Choose the Right AI Plagiarism Checker?

Drawing from our experience, here are several key features to consider when choosing the best AI plagiarism checker that suits you:

• High accuracy: This is definitely the first element you have to check when choosing the right AI plagiarism checker. The higher the accuracy, the more precise text you will get.
• Data protection: Data protection is the next step to help ensure your content is not published when scanning online. To minimize the risk of leaking your information, search how that checker protects sensitive data.
• Fast response time: You should find a detector with stable performance that will not let you down during the scans.
• Detection of all plagiarism types: This is also a priority when choosing a plagiarism checker. If a tool has this feature, you can check all of the plagiarism types, which enhances the quality of your content.
• Authorship verification: This feature can help you detect content that is paraphrased, has changed word forms, tenses, voices, etc.

Conclusion

So, what is the best AI plagiarism checker? By doing so many experiments on all of these detectors, TechDictionary takes a closer look at the impressive features and highly recommends you use Originality AI. This is the best choice for you to check plagiarism with the highest accuracy rate that we have ever tested.

FAQs