18.3
Noplag is an open-source plagiarism checker, with a hosted cloud service and an engine released under Apache 2.0.
Free planOpen sourceWebAPILinux
Best AI Plagiarism Checkers in 2026
AI plagiarism checkers can support reviews of written work, but document limits, source coverage and reporting options differ among tools. Compared on AI writing check and source coverage, the entries also specify maximum document words and supported file formats. Consider LMS integrations and API access when you need to understand how a checker may connect with other systems; report export can matter when you need…
28.0
Plagiarisma is an originality checker that scans text against web sources, books, and academic papers.
Free planAndroidWebAPI
38.0
Plagium analyzes textual similarity and looks for writing patterns compatible with AI-generated content.
Free planAndroidiOSWeb
- 4
Copyscape
Copyscape checks web content and newly created human- or AI-generated text for plagiarism and duplicate material found online.
Free planWebAPISelf-hosted7.5From $4.95 a month - 5
PlagAware
PlagAware is a plagiarism search engine for educational institutions, businesses and individuals.
Free planWebAPI7.4Free plan - 6
Copyleaks AI Detector
Copyleaks AI Detector identifies AI-written text, including text blended with human writing.
WebAPIExtensionSelf-hosted7.2 - 7
Check-Plagiarism
Check-Plagiarism checks submitted text and reports duplicated sections, similarity percentages and matching sources.
AndroidWebAPI6.9 - 8
SmallSEOTools Plagiarism Checker
SmallSEOTools Plagiarism Checker compares submitted writing with online material and returns a report showing where matches appear.
Free planWebAPIExtension6.9From $94.08 a year - 9
DrillBit
DrillBit is an AI-powered platform for plagiarism detection and content integrity.
AndroidiOSWebAPI6.8$5 one-time - 10
Plagius
Plagius analyzes academic papers and other documents for possible plagiarism by checking the internet or local files.
WebmacOSWindows6.8From $58.80 a year - 11
PrePostSEO Plagiarism Checker
PrePostSEO Plagiarism Checker checks submitted text for copied or duplicate content and reports plagiarism and unique-content percentages alongside…
AndroidiOSWebAPI6.8From $7.50 a year - 12
Proofademic
Proofademic analyzes submitted writing for possible AI-generated content and plagiarism.
Free planWebAPI6.8From $15 a month - 13
Plagiarism Checker X
Plagiarism Checker X is Windows desktop software for checking documents and text against published web pages for plagiarism and similarity.
Free planWindows6.6$39.95 one-time - 14
PlagiarismSearch
PlagiarismSearch checks submitted text against selected web, archived, publication, academic, and enabled organizational sources.
WebAPIExtension6.4From $27.95 a month - 15
StrikePlagiarism
StrikePlagiarism is an academic integrity system for finding text similarity, paraphrasing, and AI-generated content.
WebAPISelf-hosted6.4$2.50 one-time - 16
PlagiarismCheck.org
PlagiarismCheck.org checks text originality, verifies authorship, detects AI-generated content, and provides writing checks.
WebAPIExtension6.2$5.99 one-time - 17
DupliChecker
DupliChecker is an online collection of SEO and text analysis tools, including a plagiarism checker that assesses the originality of text.
WebAPI6.1From $9.99 a month - 18
iThenticate
WebAPI6.1$125 one-time - 19
PlagPointer
PlagPointer is a web service that checks documents for plagiarism and AI content in one scan.
Web6.1 - 20
Scribbr Plagiarism Checker
Scribbr Plagiarism Checker is a web service for comparing academic work with online and published sources.
Web6.1$19.95 one-time - 216.1£5 one-time
- 22
PlagiarismDetector.net
PlagiarismDetector.net is an online service for checking plagiarism and similarity in text.
WebAPIExtension6.0From $9.99 a month - 23
SearchEngineReports Plagiarism Checker
SearchEngineReports Plagiarism Checker is a web tool for checking text, files, or webpages for similar material.
Web6.0From $1,012 a month - 24
Turnitin Originality
Turnitin Originality adds academic integrity capabilities to similarity checking for institutions addressing misconduct beyond plagiarism.
Web5.3 - 25
Turnitin Similarity
Turnitin Similarity is a web and API product that helps educators review student work for possible plagiarism and collusion.
WebAPI5.2