Instead of Noplag
Noplag alternatives
Noplag offers an open-source plagiarism checker alongside a hosted service. It compares documents with web, academic and other sources, and its reports connect matches to source text with a similarity score. Users can submit files, pasted text or URLs, then export results as PDFs. The free plan allows three checks each month, up to 2,500 words per check; paid plans start at $9.99 per month and add higher limits and, depending on tier, more sources, live-web search, API access and support. LMS integrations and self-hosted deployment are also options.
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Dolos
Free plan Open source APILinuxMac+3Comparing source code submissions — Dolos analyzes source code similarities, while Noplag checks documents against web and academic sources.
Free plan Visit site - 2
Plagiarism Detector
Free plan WebWindowsDocument and AI-content checks on Windows — Plagiarism Detector adds AI detection, Unicode substitution checks and PDF, CSV and HTML reports.
Free plan Visit site - 3
Copyscape
Free plan APISelf-hostedWebChecking web pages and duplicate online content — Copyscape focuses on online duplicate content and adds batch page searches, a private index and a WordPress plugin.
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Crossref Similarity Check
Paid APIWebCrossref members checking scholarly manuscripts — Crossref Similarity Check compares manuscripts against a database containing over 78 million full-text scholarly items.
From $40/yr Visit site - 5
MOSS
Free plan LinuxWebNon-commercial programming classes — MOSS measures program similarity, excludes expected shared code and returns HTML pages highlighting matching passages.
Free plan Visit site - 6
Originality.ai
Free plan APIExtensionWebContent teams needing AI and writing tools — Originality.ai combines AI and plagiarism checks with fact checking, readability, grammar and website scanning.
Free plan · paid from $12.95/mo (annual) Visit site - 7
PlagAware
Free plan APIWebInstitutions and teams monitoring online text — PlagAware adds AI detection and continuous text monitoring, with interactive, shareable reports and more file formats.
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Check-Plagiarism
Free plan AndroidAPIWeb - 9
Copyleaks AI Detector
Free plan APIExtensionSelf-hosted+17.6 Visit site - 10
Plagiarisma
Free plan AndroidAPIExtension+2 - 11
Plagium
Free plan AndroidAPIExtension+2 - 12
DupliChecker
Free plan APIWeb - 13
PlagiarismCheck.org
Free plan APIExtensionWeb - 14
PlagiarismDetector.net
Free plan APIExtensionWeb - 15
PrePostSEO Plagiarism Checker
Free plan AndroidAPIiPhone+3 - 16
PlagiarismSearch
Free plan APIExtensionWeb - 17
Plagiarism Checker X
Free plan Windows - 18
SmallSEOTools Plagiarism Checker
Free plan APIExtensionWeb - 19
Proofademic
Free plan APIWeb - 20
Scribbr Plagiarism Checker
Free plan Web - 21
SearchEngineReports Plagiarism Checker
Free plan Web - 22
Viper
Free plan Web - 23
DrillBit
Paid AndroidAPIiPhone+1 - 24
Plagius
Free trial MacWebWindows - 25
StrikePlagiarism
Free trial APISelf-hostedWeb - 26
iThenticate
Paid APIWeb - 27
PlagPointer
Paid Web - 28
Turnitin Similarity
Paid APIWeb - 29
Turnitin Originality
Paid Web
A different tool may fit better if you need something beyond Noplag’s current focus on verbatim and near-verbatim copying. It does not detect paraphrase, and AI-content detection is still forthcoming. Its five launch-calibrated languages and free-plan word limit may also shape your choice. Compare alternatives by the type of material they analyze, their source coverage, AI detection, privacy, report formats, price and platform options. A code-focused checker, for example, serves a different task from a document checker, while some alternatives add local indexing or broader content tools.