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Plagiarism and Citing Sources (Health Affairs): Plagiarism Checkers / iThenticate

Created by Health Science Librarians

iThenticate Plagiarism Software

Plagiarism Checkers

The following are examples of cost and free software available on the internet.

Caveats with free software:  Many free tools use web searching to identify plagiarism rather than comparing to other student papers.  Supposedly some free software will store and sell student papers.

Software Cost Description Website
TurnItIn Institutional license only

For faculty to check originality and quality of content.

iThenticate (by TurnItIn)

Free for UNC affiliates, but limited to 50,000 documents

For published materials and pre-submission review of manuscripts, dissertations, and grant applications. Available in institutional and individual formats.

WriteCheck (by TurnItIn)

from $7.95 to $29.95

Plagiarism/grammar check for students. Single paper, semester plan, graduate plan.


Free copy and paste; $8/month for up to 50 uploads

Copy and paste (free) or upload (with subscription).  Gives location of plagiarism and links to check original sources.

Grammarly Plagiarism Checker

Free, but must create account for detailed results like location of error

Copy and paste at least a paragraph or upload a file to check for plagiarism and grammar. Free, but must create account for more details

Copy and paste text. Gives location of plagiarism but must create an account for more detail.

There are many other plagiarism detection tools available online but not all are trustworthy.  Be sure to consider who your audience is (faculty and/or students), how the tools search (web search or comparing to a bank of papers), what the sites do with the papers you check, and if you want other grammatical/writing resources as part of the software you choose.