4
Dolos
Dolos is a free, open-source tool for finding similarities between source-code submissions, particularly for teachers reviewing programming tests,…
Free planOpen sourceWebAPILinuxmacOS
7.7Free plan
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5
Originality.ai
Originality.ai offers tools for checking AI-generated text, plagiarism, facts, readability, grammar, spelling, and content quality.
Free planWebAPIExtension
7.6From $12.95 a month
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6
Copyscape
Copyscape checks web content and newly created human- or AI-generated text for plagiarism and duplicate material found online.
Free planWebAPISelf-hosted
7.5From $4.95 a month
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7
GPTZero
GPTZero identifies likely AI-generated writing and highlights potential AI use at document, sentence, and word level.
Free planWebAPIExtension
7.5From $8.33 a month
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8
JPlag
JPlag compares programs with one another to identify pairwise similarities that may indicate source-code plagiarism or collusion.
Free planOpen sourceWebAPILinuxmacOS
7.5Free plan
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9
Winston AI
Winston AI detects AI-generated text and images and includes plagiarism checking and other content-integrity tools.
Free planWebAPIExtensionSelf-hosted
7.5From $189 a month
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10
Copyleaks AI Detector
Copyleaks AI Detector identifies AI-written text, including text blended with human writing.
WebAPIExtensionSelf-hosted
7.2
Visit
11
Noplag Engine
Noplag Engine is an open-source tool for finding verbatim and near-verbatim matches against a corpus you control.
Free planWebAPILinuxmacOS
7.1From $9.99 a month
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12
SmallSEOTools Plagiarism Checker
SmallSEOTools Plagiarism Checker compares submitted writing with online material and returns a report showing where matches appear.
Free planWebAPIExtension
6.9From $94.08 a year
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13
DrillBit
DrillBit is an AI-powered platform for plagiarism detection and content integrity.
AndroidiOSWebAPI
6.8$5 one-time
Visit
14
Plagius
Plagius analyzes academic papers and other documents for possible plagiarism by checking the internet or local files.
WebmacOSWindows
6.8From $58.80 a year
Visit
15
Quetext AI Detector
Quetext AI Detector analyzes writing for signs of AI-generated text and displays line-by-line results with a confidence score.
Free planWebAPIExtension
6.8From $7.99 a month
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16
Codequiry
Codequiry checks submitted source code for plagiarism and AI-generated code, helping educators verify student work.
WebAPILinuxmacOS
6.7From €25.76 a month
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17
PlagiarismCheck.org
PlagiarismCheck.org checks text originality, verifies authorship, detects AI-generated content, and provides writing checks.
WebAPIExtension
6.2$5.99 one-time
Visit
18
DupliChecker
DupliChecker is an online collection of SEO and text analysis tools, including a plagiarism checker that assesses the originality of text.
WebAPI
6.1From $9.99 a month
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19
iThenticate
WebAPI
6.1$125 one-time
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20
MOSS
MOSS measures program similarity and has primarily been used to identify possible plagiarism in programming classes.
Free planWebLinux
6.1Free plan
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21
PlagPointer
PlagPointer is a web service that checks documents for plagiarism and AI content in one scan.
Web
6.1
Visit
22
Scribbr Plagiarism Checker
Scribbr Plagiarism Checker is a web service for comparing academic work with online and published sources.
Web
6.1$19.95 one-time
Visit
23
PlagiarismDetector.net
PlagiarismDetector.net is an online service for checking plagiarism and similarity in text.
WebAPIExtension
6.0From $9.99 a month
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24
Plag.ai
Plag.ai is a web service for plagiarism checking, AI-text detection, and translated-plagiarism analysis.
Web
5.9From €14.95 a month
Visit
25
WINNOWR
WINNOWR is a CPU-first engine for identifying potential web-source matches in student writing and other long-form text.
WebAPILinuxSelf-hosted
5.7
Visit
26
Codeleaks
WebAPISelf-hosted
5.3
Visit
27
Turnitin Similarity
Web
4.6
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