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Top Rated Plagiarism Checker Software with Api

Last updated: September 2026

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25 software options

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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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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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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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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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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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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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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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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ProWritingAid logo

Grammar checker, manuscript editor, & writing trainer

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ProWritingAid is a web-based grammar checking, manuscript editing, and personal writing solution designed to help fiction/non-fiction writers, bloggers, students, and content writers improve style, eliminate errors, visualize sentence variations, and more within written content.

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AI Image Detector logo

Cloud API for AI image detection at pixel level

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Cloud-based REST API that detects fully AI-generated and partially manipulated images at pixel level for enterprise fraud, compliance.

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UniqeCheck logo
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WordBinary logo
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AI, plagiarism and grammar checks in one platform

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WordBinary is a web-based document analysis platform offering AI content detection, plagiarism checking and grammar review. Users receive sentence-level findings, highlighted source matches and downloadable PDF reports through one streamlined interface.

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Stavio logo
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AI project communication & client update tool

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Stavio is an AI-powered project communication tool designed for project managers and agencies. The software automatically transforms project status information into professional client updates. Stavio aims to streamline the process of creating customer communications for project management professionals.

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Kreativespace logo
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Making Writing Accessible for Everyone.

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Kreativespace is an AI-writing tools platform making content creation, refinement, checking & conversion faster, easier, accessible & affordable.

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i-net PDFC logo
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Intelligent Document Comparison for Business

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i-net PDFC identifies content similarities and meaningful differences across PDF, Office, image, and text documents. Compare documents with deep structural analysis to detect copied, modified, or reused content while minimizing false positives.

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Plag Check for Business logo
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A Turnitin similarity report with a full source breakdown, plus AI writing detection, on any document within 15 minutes. Nothing is ...

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Compilatio logo
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Plagiarism and AI Content Detector

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An anti-plagiarism programme that is flexible and customised for each educational entity.

With its comprehensive program, Compilatio promotes plagiarism prevention by providing institutions with: AI-generated content detector, similarity detection software, real and ongoing support, etc.

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Copyscape logo

Online plagiarism detection tool

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Copyscape is a real-time online plagiarism detection tool that allows users to automatically scan the web for content taken from their website & check the originality of content added to their systems. Copyscape offers a free checking tool, Premium service & API, and Copysentry protection system.

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Advacheck logo
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Plagiarism checker software

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Advacheck is a cutting-edge system that effectively identifies text and image similarities in scientific and student papers, catering to academic, corporate, and research communities worldwide. With comprehensive cross-language text analysis in various languages, Advacheck ensures accurate results. It goes beyond the text, detecting plagiarized images to protect visual content creators. Additionally, the system scrutinizes AI-generated fragments, keeping up with deep learning models.

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GPTZero logo

Cloud-based AI content detector for teams

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Cloud-based AI content detection platform for educators, publishers, and enterprises, offering document, sentence, and word-level.

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