Best Check-Plagiarism Alternatives in 2026

Updated October 2026

20 platforms from AI plagiarism checkers ranked against Check-Plagiarism on the same published basis.

1
Noplag Free plan apiLinuxMacself-hostedWeb $9.99/mo7.9
Check-Plagiarism vs Noplag
2
PlagAware Free plan apiWeb €2.99/mo7.7
Check-Plagiarism vs PlagAware
3
Copyscape Free plan apiself-hostedWeb $4.95/mo7.6
Check-Plagiarism vs Copyscape
4
Proofademic Free plan apiWeb $15/mo7.5
Check-Plagiarism vs Proofademic
5
Plagium Free plan AndroidiOSWeb Free7.2
Check-Plagiarism vs Plagium
6
Compilatio AI Detector Free trial apiWeb 7.0
Check-Plagiarism vs Compilatio AI Detector
7
Copyleaks AI Detector Free trial apiextensionWeb $1.17/mo7.0
Check-Plagiarism vs Copyleaks AI Detector
8
Plagiarism Checker X Free plan Win Free7.0
Check-Plagiarism vs Plagiarism Checker X
9
Plagiarisma Free plan WebWin Free7.0
Check-Plagiarism vs Plagiarisma
10
PlagiarismSearch Free trial apiextensionWeb $27.95/mo7.0
Check-Plagiarism vs PlagiarismSearch
11
Plagius Free trial MacWebWin $4.90/mo7.0
Check-Plagiarism vs Plagius
12
SmallSEOTools Plagiarism Checker Free plan apiextensionWeb $7.84/mo7.0
Check-Plagiarism vs SmallSEOTools Plagiarism Checker
13
PrePostSEO Plagiarism Checker AndroidapiiOSMacWeb $0.35/mo6.8
Check-Plagiarism vs PrePostSEO Plagiarism Checker
15
StrikePlagiarism Free trial apiself-hostedWeb 6.6
Check-Plagiarism vs StrikePlagiarism
16
SearchEngineReports Plagiarism Checker Web $1,012/mo6.5
Check-Plagiarism vs SearchEngineReports Plagiarism Checker
17
DrillBit AndroidapiiOSWeb 6.4
Check-Plagiarism vs DrillBit
18
PlagiarismCheck.org apiextensionWeb 6.4
Check-Plagiarism vs PlagiarismCheck.org
19
DupliChecker apiWeb $9.99/mo6.3
Check-Plagiarism vs DupliChecker
20
Scribbr Plagiarism Checker Web 6.3
Check-Plagiarism vs Scribbr Plagiarism Checker
21
Turnitin Originality Web 6.3
Check-Plagiarism vs Turnitin Originality

Check-Plagiarism alternatives compared

#	Platform	Score	Free plan	From	Runs on
1	Noplag	7.9	Free plan	$9.99/mo	API, Linux, Mac, self-hosted, Web, Windows
2	PlagAware	7.7	Free plan	€2.99/mo	API, Web
3	Copyscape	7.6	Free plan	$4.95/mo	API, self-hosted, Web
4	Proofademic	7.5	Free plan	$15/mo	API, Web
5	Plagium	7.2	Free plan	Free	Android, iOS, Web
6	Compilatio AI Detector	7.0			API, Web
7	Copyleaks AI Detector	7.0		$1.17/mo	API, Browser, Web
8	Plagiarism Checker X	7.0	Free plan	Free	Windows
9	Plagiarisma	7.0	Free plan	Free	Web, Windows
10	PlagiarismSearch	7.0		$27.95/mo	API, Browser, Web
11	Plagius	7.0	No	$4.90/mo	Mac, Web, Windows
12	SmallSEOTools Plagiarism Checker	7.0	Free plan	$7.84/mo	API, Browser, Web
13	PrePostSEO Plagiarism Checker	6.8		$0.35/mo	Android, API, iOS, Mac, Web, Windows
15	StrikePlagiarism	6.6	No		API, self-hosted, Web
16	SearchEngineReports Plagiarism Checker	6.5		$1,012/mo	Web
17	DrillBit	6.4	No		Android, API, iOS, Web
18	PlagiarismCheck.org	6.4			API, Browser, Web
19	DupliChecker	6.3		$9.99/mo	API, Web
20	Scribbr Plagiarism Checker	6.3			Web
21	Turnitin Originality	6.3			Web

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Questions about Check-Plagiarism alternatives

What is the best alternative to Check-Plagiarism?

Noplag, number 1 in AI plagiarism checkers with a score of 7.9 out of 10. The others here: PlagAware, Copyscape, Proofademic and 16 more.

What is the best free alternative to Check-Plagiarism?

Noplag is the best-ranked alternative with a free plan. 8 of the 20 alternatives here publish a free plan on their own pricing pages.

How are these alternatives ranked?

Ranked on how quickly a newcomer can get going: documentation depth, a free tier or trial, and the platforms it runs on.