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Top Rated Plagiarism Checker Software with Open source

Last updated: September 2026

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50 software options

WriterZen logo

Cloud-based SEO content workflow tool for teams

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Cloud-based SEO content platform for marketers, agencies, and freelancers, covering keyword research, topic discovery, and AI-assisted.

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PlagiarismCheck.org logo

Powerful plagiarism and ChatGPT detector.

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PlagiarismCheck.org advanced algorithms detect similarities and AI tools usage. It's comprehensive report, available for more than 15 languages, shows the percentage of human-written or AI-generated content, indicates authorship and checks grammar and spelling.

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Grammarly logo

Cloud-based AI writing assistant for teams

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Cloud-based AI writing platform delivering real-time grammar, tone, style, and clarity suggestions across web, desktop, and mobile.

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Smodin logo

Cloud-based AI writing platform for all team sizes

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Cloud-based AI writing platform offering content detection, humanization, plagiarism checking, and AI-assisted writing for students.

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Originality.AI logo

Cloud-based content integrity platform for teams

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Cloud-based content integrity platform combining AI detection, plagiarism checking, fact-checking, and readability scoring for content.

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AIDetectPlus logo

AI detector & humanizer tool that works with essays & blogs

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AIDetectPlus is an AI detector and humanizer tool that works with essays, blogs, and papers. It is designed to help students, teachers, professors, and marketers detect and humanize AI-generated content. The tool provides detailed reports on the AI content in a given text and allows users to quickly humanize the content with just a click of a button.

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Multilings logo

Best AI and Neural based natural Content Writing tools

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Multilings is an AI-powered product that offers many tools like an article generator, short story creator, meta descriptions, product descriptions, product names, startup ideas, etc. It also has a language translation tool to translate one language to another in a very natural way.

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Plagium logo

Plagiarism checker with Google Docs integration

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Plagium is a web-based plagiarism detection tool that helps businesses across all industries ensure the originality of written content. The solution offers quick text search, deep text search, and complete file search and provides summary reports to provide insight into any instances of plagiarism.

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Trinka logo

AI-enabled grammar checker and language correction tool

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Trinka is a cloud-based writing assistant that uses Artificial Intelligence (AI) to help professionals in academic institutions, media and publishing houses, language service providers, marketing agencies, and businesses across the life sciences industry.

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Check Plagiarism logo

Ensuring originality with precision and ease.

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Check-Plagiarism offers a free online plagiarism checker tool that helps students, writers, and content creators detect plagiarism with 100% accurate results. The tool scans text against billions of web pages and online resources, providing a detailed report with percentages to identify unique and plagiarized content. It supports multiple file formats and offers sentence-based checking, enhanced reporting, and relevant tools like a paraphrasing tool and citation generator.

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Plagiarismchecker.co logo

Online plagiarism checker tool for teachers and writers.

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Plagiarismchecker.co is an online tool that uses advanced technology to identify plagiarism within content. It is designed to help students, teachers, and writers check for unoriginal content in documents and web pages. Queries compare content against journals, books, plus other online sources.

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CorrectEnglish logo

AI-powered proofreading and plagiarism checker

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CorrectEnglish is an intelligent proofreading solution that can correct contextual and spelling English errors for emails, presentations, essays, and more, providing accurate feedback on spelling and grammar with clear explanations. Using a word recommendation engine and over 63,000 advanced grammar rules, CorrectEnglish can improve writing by simplifying traditional writing rules, providing complex word suggestions, and pointing common spelling errors.

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Winston AI logo

Cloud-based AI content detection for all org sizes

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Cloud-based AI content detection for educators, publishers, and enterprises, with text analysis, plagiarism checks, and reporting.

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iThenticate logo

Plagiarism checker for institutions, researchers, publishers

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iThenticate by Turnitin is a plagiarism checker tool for academic institutions, researchers, and publishers. It can find similarities in content when compared to top-cited journals and other online sources. iThenticate supports file upload in multiple formats, including DOC, DOCX, PDF, plus others.

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Scribbr Plagiarism Checker logo

Plagiarism checker tool for students and institutions

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Scribbr Plagiarism Checker highlights multiple types of plagiarism within documents. It supports documents in over 20 languages that can be uploaded in DOC, DOCX, and PDF formats. It provides detailed plagiarism reports that can be customized using various settings, such as similarity percentages.

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Cloud Assess logo

See every skill. Prove competency. Close the gaps.

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Built-in Turnitin integration checks written submissions inside your assessment workflow. Geo-login maps, two-factor authentication, timestamped submissions and quality check sampling add authenticity controls beyond plagiarism detection.

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Quetext logo

Plagiarism detection tool with deep search technology

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Quetext is an online plagiarism detection tool that uses natural language processing and DeepSearch algorithms to detect cases of plagiarism within texts. It can be used by teachers, students, and professionals to ensure content is 100% original or accurately cited using the citation assistant.

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ZeroGPT logo

Web-based AI content detection toolkit for teams

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Web-based AI content detection and writing toolkit for educators, businesses, and creators, offering text, image, and video analysis.

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EasyBib logo

Proofreading tool for generating bibliographies

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EasyBib is a cloud-based proofreading tool designed to help educational institutions create bibliographies, detect plagiarism issues, identify grammatical errors, and improve overall writing style using various suggestions. The centralized dashboard allows students to import academic papers.

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Plagiarism Checker X logo

Multi-language plagiarism checker for education & publishing

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Plagiarism Checker X is a plagiarism detection tool for students, teachers, writers, digital marketers, and other organizations that require content analysis. The platform is compatible with Windows 7, 8, 10, and Vista and supports analysis in a range of file formats and languages.

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Packback logo

Cloud-based learning intelligence platform for education

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Packback is a cloud-based learning intelligence platform for higher education and K-12 institutions, combining AI-supported.

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PlagScan logo

Web application for detecting plagiarism in documents

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PlagScan is a web application designed to check for plagiarism on digital documents. The software is available for download as a desktop, mobile, and browser-based SaaS web app. It caters to academic facilities, students, and content writers.

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Noplag logo

Writing assistance, grammar check, and plagiarism detection.

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Noplag is a web-based writing assistance app with plagiarism detection, grammar check, and citation assistance. Users can upload files in many formats including DOC, PDF, HTML, and others. Content is checked against billions of sources. The app can be used by students, educators, and other teams.

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PaperRater logo

Proofreading tool to detect plagiarism & grammatical errors

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PaperRater is an online proofreading software designed to help businesses leverage artificial intelligence (AI) technology to identify grammatical mistakes, detect plagiarism, and automatically score essays. Teachers can upload files in multiple formats including DOC, ODT, TXT, RTF, and DOCX.

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Copymate logo

Cloud-based AI SEO content generator for all sizes

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Copymate is a cloud-based AI content platform for digital marketers and SEO professionals that bulk-generates SEO-optimized articles.

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