Plagiarism Checker Software

Noplag

Name: Noplag
Brand: Noplag Inc

Open-source plagiarism checker and writing assistant for students, educators and publishers

By Noplag Inc

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TrustList summary

Noplag is a plagiarism checker that has run since 2014. Writers, researchers and educators upload a document and get a highlighted report. Its detection engine is released as open source under the Apache 2.0 licence.

What Noplag does

Document checks: accepts Word, PDF, plain text and similar files, pasted text or a web address.
Source comparison: matches against live web results, academic papers, Common Crawl, Wikipedia and its own database.
Highlighted report: each match shows the source, a similarity score and the overlapping text, with PDF export.
Writing tools: an online editor with grammar checking and citation styles such as APA, MLA, Chicago and Vancouver.
API: a REST interface with webhooks.

Clients

Students, teachers, researchers, publishers and businesses that protect web content.

Key facts

Started: 2014
Engine: open source, Apache 2.0
Interface languages: 19
Roadmap: AI-content detection listed as coming soon

Summary written by TrustList from the business's own published information, Oct 2026.

Categories & features

Rankings

Noplag is ranked on 8 TrustList rankings: #5 on 1 and #6 on 7.

Every ranking orders its listings by their reviews, how complete the profile is and the Trust Score. Noplag has no reviews yet and 3 of the 10 profile details we look for. Where no listing on a page has been reviewed, the order follows the profiles alone.

Plagiarism checker software · 8 rankings

On 7 of these it sits behind Plagiarism Detector, ahead of iThenticate.

#5of 6
Source database
It is the only one of the 6 here listing text editor and one of 2 here listing punctuation check.
Of the 6 here, 5 also cover multiple file format support.
#6of 7
Academiceducation
It is one of 2 here listing spell check and one of 3 here listing bulk upload.
Of the 7 here, 6 also cover grammar check and 6 also cover source database.
#6of 7
Content scan
It is one of 4 here listing plagiarism detection and reporting & statistics.
#6of 7
Corporatebusiness
It is one of 5 here listing side-by-side comparison and one of 6 here listing grammar check.
#6of 7
Reporting
It is one of 6 here listing source database.
#6of 7
Text similarity detection
It is the only one of the 7 here listing text editor and one of 2 here listing punctuation check.
#6of 7
Web based cloud saas
It is the only one of the 7 here listing text editor and one of 2 here listing punctuation check.
#6of 6
Grammar check
It is the only one of the 6 here listing text editor and one of 2 here listing bulk upload.
Behind Plagiarism Detector.