Overview of the Best Plagiarism Checkers on the Whole Internet

Nowadays, avoiding plagiarism is especially relevant, because failure to do so may not only result in academic penalties but also destroy one’s good name. Tackling plagiarism in the works of others isn’t that easy. Similarly, it may be challenging to avoid it in one’s own work because it isn’t always intentional. Modern plagiarism software may be useful. Still, while more plagiarism detection services enter the market, few of them are really effective. We’ve tested eight popular online tools in order to identify the best plagiarism checker both students and professional writers use to ensure content originality.

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Evaluating Best Plagiarism Software

We’ve tested eight popular plagiarism checkers in order to identify the best of them based on five criteria that users often point out as most important. We reviewed DupliChecker, Copyleaks, Plagiarisma, Grammarly, Quetext, Plagium, Scribbr, and AResearchGuide. We examined conditions of usage, compared interfaces, tested functionality, evaluated usability, as well as determined accuracy of each checker.

We’ve used several different texts for determining whether checkers under concern are accurate in tackling plagiarism. One test article contained incorrectly formatted in-text citations, lacked quotation marks where they were necessary, as well as included several fake citations. Another test article was aimed at determining whether checkers may identify what students and writers know as mosaic or patchwriting plagiarism. Next example was a compilation of sentences borrowed from several online publications word-for-word without any acknowledgement of original sources. Finally, the last test article was plagiarism free. Here are some results of our efforts along with short overviews of tested checkers.

DupliChecker

DupliChecker is positioned as the most popular plagiarism checking tool available online for free. It compares your writing with content published online. While testing this tool, we revealed both some pros and cons that are worth mentioning:

Pros:

  • Tool has a simple interface.
  • Completely free of charge.
  • Several format options. Either upload a .doc or .txt file or paste their texts into a search box.

Cons:

  • Has 1000 words limit per search. By signing up and getting an account, which is free of charge, one may increase the limit to 1500 words. However, this is still not enough. While the tool is convenient for short articles, checking longer works is more time and effort consuming.
  • Hardly accurate. Although the checker marked the article that contained no copyright issues as plagiarism-free, it failed to determine accurately the instances of plagiarism in other test texts. Our tests showed that the tool does not recognize in-text citations and direct quotes. It doesn’t mark repeating plagiarism when sentences copied word-for-word from an uncited source appear several times in the paper. When we ran this tool with a 100% plagiarized text, it found only 25% of copied content, suggesting that the remaining 75% were unique.

Given our tests and reviews, here’s an evaluation of DupliChecker based on five popular criteria.

Price – This tool is completely free of charge.

Interface – Simple. Results are clearly presented in two boxes: one contains our tested content with marked sentences and another box shows original sources identified by a checker.

Functionality – Paste 1000-word-long text or upload it in .doc or .txt format (word limit remains).

Usability – More oriented on businesses, but students may also use this tool.

Accuracy – Not accurate. Although it found some instances of plagiarism, results were not accurate, given that only 25% were found in a 100% plagiarized text.

What the point of convenience, free membership, or usability, if this tool does not fulfil its main function, which is ensuring originality by tackling every instance of plagiarism? Given that DupliChecker was not accurate while identifying plagiarism in our test texts, we cannot recommend it.

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Copyleaks

As its developers suggest, Copyleaks uses sophisticated artificial intelligence technology, helping users detect plagiarism in content. This checker has a good interface, but only registered users enjoy it. Copyleaks has a very appealing webpage, which describes this checker in great detail, explaining its strengths along with advantages, mentioning different user categories that can benefit from it. As our tests proved, this information is largely true, and Copyleaks has more advantages than disadvantages. Here are some pros and cons:

Pros:

  • This checker supports various format files in addition to copy-pasted text;
  • There are no language restrictions;
  • It introduces additional tools like MS-Office add-on or Google Docs add-on that make plagiarism checking even more convenient;
  • This checker is universal. It can be used for educational as well as business-related purposes. Copyleaks welcomes students, teachers, universities, schools, publishers, SEO agencies, lawyers, and bloggers to join its user community.

Cons:

  • Registration is compulsory. This takes some time, as e-mail verification is necessary.
  • Newly registered clients sign up for a free trial, which allows them to check only 10 pages of text for free. According to company’s rules, this equals to 2500 words.
  • To scan more than 2500 words per month, subscribe for a monthly plan, which costs $24.99/month and allows them checking up to 62500 words monthly, or get a prepaid 500 pages equaling to 125000 words for $57.99.

Based on results of our trials and reviews, here are our estimates.

Price – Check only 2500 words for free. In order to scan more content, they choose among only two available options: prepayment or monthly subscription. Many customers consider available prices unreasonably high.

Interface – Its interface isn’t as simple as that of DupliChecker, but it’s still quite convenient. Copyleaks provides 24/7 customer support, so users get help whenever they need it.

Functionality – This checker supports numerous formats (.doc, .txt, pdf among others) and provides add-ons, which make scanning more convenient. There are no language limitations.

Usability – This tool is universal. It appeals to large user community, including students, teachers, businesses, and SEO professionals among others.

Accuracy – Copyleaks is quite accurate. In our 100% plagiarized text, it identified 98% of plagiarism. This checker is sensitive to quotation marks. Still, it hardly ensures the accuracy of in-text citations. During our tests, direct quotes that completely lacked in-text citations or were followed by fake ones were not identified as plagiarism. Similarly, this checker failed to mark repeating plagiarism, when sentences copied word-for-word from an uncited source appeared several times in the paper.

Copyleaks is not 100% accurate, and the prices are unreasonably high. Still, we recommend it as a good detection tool. Users should mind though that Copyleaks fails to mark some plagiarism kinds.

Plagiarisma

Plagiarisma is another tool for plagiarism check, which supports numerous file formats and even allows URL check. Plagiarisma appeals to students and teachers as its primary customers. Despite its benefits, which include plagiarism check using several search engines, this tool has many cons. Here are some of our findings:

Pros:

  • It supports many languages;
  • It uses several search engines;
  • There are multiple options for paid membership. Check them and choose the one that fits them most.

Cons:

  • Its interface is poor. It isn’t clear which services are available to free users. At some point, you simply become redirected to a page that states you’ve reached a daily limit and suggests you get an upgrade.
  • 1 search is limited to 2000 characters only.
  • Description of this checker contains grammatical errors.
  • Usage conditions are unclear. For instance, it’s suggested that 1 user can conduct 100 searches during the day for $8, but it isn’t explained what is meant by a “search”.
  • Results are not accurate. Different search engines provide different results for a single text.

Price – Try it for free, but the number of free trials is limited. It’s not specified, which is very inconvenient. There are many options for paid membership, still, the plans are not described well.

Interface – Interface is not user-friendly. There are grammatical errors. Users lack information they need to use this tool effectively.

Functionality – It supports various file formats and allows checking URLs.

Usability – It only appeals to students and teachers.

Accuracy – The tool is not accurate. Different search engines bring different results for a single text. 100% plagiarized text was marked as 100% unique and 30% unique in two searches using Google and Bing correspondingly. In contrast, our 100% unique text was marker as 100% unique and 51% unique in two searches using Google and Bing correspondingly. Closer review of the list of proposed original sources proved they were completely irrelevant.

Given the results of our tests, we can’t recommend this tool. It’s not clear how the algorithm works, but it’s completely inaccurate. Paid membership is unreasonable in this case, given that the tool will not perform its primary function; it will not ensure originality accurately.

Grammarly

Grammarly looks for plagiarism, simultaneously finding other writing issues, particularly grammatical, writing style or sentence structure errors. Although this tool is positioned as free, users need to signup and get a paid membership in order to get access to more detailed results. Otherwise, they will simply receive notices stating that “significant plagiarism was detected” or “no plagiarism was detected.” Here are some pros and cons of this service.

Pros:

  • Checks grammar, punctuation, word choice, and writing style additionally;
  • Convenient interface; it’s user-friendly.
  • Uses ProQuest database while scanning papers.

Cons:

  • Although it’s positioned as a free checker, de-facto paid membership is necessary.
  • Free account provides only general evaluation, which hardly is used by users as a means for content improvement.
  • It only detects exact similarities; while patchwriting remains undetected.

Here is our more detailed assessment:

Price – Paid membership is necessary despite a free checker positioning; there are three options available: monthly ($29.95/month), quarterly ($19.98/month), and annual ($11.66/month) memberships.

Interface – Interface is user-friendly, but users have to sign up for detailed reports.

Functionality – Paste text or upload it in a file. The list of supported formats isn’t clarified.

Usability – This tool is universal.

Accuracy – Free membership provides no details except for general evaluation. In this case, plagiarism check is an additional service, which undeniably affects its quality. The tool finds exact matches but fails to identify patchwriting. Also, checker failed to mark repeating plagiarism, when the same sentences copied word-for-word from an uncited source appeared several times in the paper.

We will not recommend this checker, given that it isn’t accurate enough. It’s unreasonable to buy paid membership with the aim of ensuring content originality. Still, users who already use Grammarly for proofreading purposes benefit from this additional service. They should mind though that this checker fails to identify some kinds of plagiarism.

Quetext

Quetext is a plagiarism checker for students, teachers, and professionals. But only three 500-word basic searches are available for free. To check more, users should buy a PRO membership, which costs $9.99/month.

Pros:

  • The interface is very user-friendly. Everything is clearly explained and users get extra clues on every step;
  • Basic and deep searches are available.

Cons:

  • Most options require paid membership;
  • PRO membership ($9.99/month) is also limited to only 50 pages or 25.000 words.

Price – Only three 500-word basic searches are available for free. PRO membership costs $9.99/month.

Interface – It’s very user-friendly. Users get support on every step.

Functionality – For file upload, paid membership is necessary.

Usability – Appeals to teachers, students, and professionals.

Accuracy – Quite accurate. It identified 80% in a 100% plagiarized paper. Quetext correctly found sources that were plagiarized. Still, the tool failed to identify an uncited direct quote as plagiarism.

Although the tool identified plagiarism quite accurately, some instances were not noticed. Even paid membership is limited to only 50 pages, so people who frequently need to check large pieces of content should look for other options.

Plagium

Plagium provides free searches in which users check texts that don’t exceed 1000 characters in length and suggests free membership. Still, to be able to check papers conveniently, for instance, upload longer texts or other file formats users need to buy paid membership. Users may choose among several paid options depending on the number of pages or searches. Here are some pros and cons we outlined:

Pros:

  • Multiple paid membership options are available;
  • A paid membership allows users to compare two files, looking for similarities;
  • It looks for plagiarized content across the web as well as across social media platforms.

Cons:

  • Almost nothing can be done for free, as majority of features, including file upload, require users to sign up and get paid membership;
  • Free membership provides access to quick searches only, which generate little feedback.

Price – Paid membership is necessary. There are several options available. However, they are described quite vaguely. For instance, for 80€ you may buy “between 324 and 1299 pages.”

Interface – User-friendly. It’s possible to have either quick or deep search.

Functionality – Analyze texts, files, or URLs. However, free membership only allows text analysis.

Usability – The tool is universal.

Accuracy – Quite accurate, although paid membership is necessary. Otherwise, search results are presented in a manner that can hardly help students or writers improve their content.

Overall, Plagium is quite accurate, but paid membership is necessary. This service is costly though. Free membership provides little benefits; it can hardly help ensure text originality unless the text is already 100% plagiarism-free.

Scribbr

Scribbr does not suggest any free checks. Instead, users should pay $18.95 for checking up to 7.500 words.

Pros:

  • The interface is user-friendly;
  • It has access to scholarly databases.

Cons:

  • There are no free services, so it isn’t possible to test its accuracy without paying;
  • You should pass many steps, including membership payment, before getting any results.

Price – Three price options are available, depending on text length. There are no free services.

Interface – User-friendly, but requires to take many steps and read a lot before they get to the process of checking.

Functionality – It supports multiple languages and allows uploading word or PDF files.

Usability – It primarily appeals to students.

Accuracy – Impossible to check its accuracy without paying first. We had some issues while testing this tool.

Unlike other reviewed checkers, Scribbr does not allow free trials, which is very suspicious. We had issues while testing it, so we will not recommend Scribbr. Given that there are numerous other options available online, paying without checking quality first is completely unreasonable.

AResearchGuide

AResearchGuide is a completely free checker that brings many advantages to users.

Pros:

  • It requires no registration and is completely free of charge. This is definitely an advantage given that AResearchGuide checker is always available online.
  • There’s no unreasonable character limit;
  • Provides a clear report for download;
  • Doesn’t save user content;
  • Speedy and accurate.

Cons:

Interface is user-friendly, but it’s too simple.

Price – Completely free of charge.

Interface – User-friendly, but it’s too simple.

Functionality – Either paste text or upload various file formats.

Usability – This tool is universal, although students and writers will love it the most.

Accuracy – Very accurate. It perfectly-identified plagiarism in our 100% plagiarized paper. Other test texts were also correctly evaluated.

Our tests suggest that AResearchGuide is the most accurate of all free checkers we’ve reviewed so far. We definitely recommend it as the best plagiarism checker, given that ensure content originality without paying for plagiarism check.

Your Best Choice

The tests we conduct during our reviews helped us identify several worthy plagiarism checkers: AResearchGuide, Quetext, and Copyleaks. However, only one of them allows users to ensure content originality completely free of charge. Based on our findings, AResearchGuide is the best plagiarism checker currently available on the market without any paid memberships. Therefore, we recommend you to check out all the benefits it provides. Quality service should be available to everyone!