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PlagiarismCheck.org vs Turnitin

Two fact sheets from our own research, side by side — pricing, platforms, API access and status re-checked by us rather than quoted from the vendors.

The short answer

Public API
Both have one
Best fit
PlagiarismCheck.org: Teachers and departments already inside Canvas, Moodle or Google Classroom · Turnitin: Universities and school districts that need similarity checking wired into Canvas, Moodle, Blackboard or D2L
Platforms
PlagiarismCheck.org: Web, Chrome extension · Turnitin: Web
Trust score
About even — PlagiarismCheck.org 87, Turnitin 88
Status
We could not check Turnitin — its site turns automated checks away; PlagiarismCheck.org was up on Sep 6, 2026

From our own records as of each tool's last check. Anything we have not confirmed is left out rather than guessed. How we verify

PlagiarismCheck.orgSimilarity report and AI-text detection in one submission, wired into the usual school LMS platformsTurnitinInstitutional similarity checking and AI-writing indicators for assignments, exams and manuscripts

Side by side

FactPlagiarismCheck.orgTurnitin
CategoryAI Detection & HumanizersAI Detection & Humanizers
Pricing modelPaidContact
Starts at$2.08/mo—
Public APIYesYes
Trust score87 / 10088 / 100
PlatformsWeb, Chrome extension, APIWeb, API
CompanyPlagiarismCheck.orgTurnitin, LLC
Launched20151998
Last verifiedSep 6, 2026Sep 6, 2026

What our research says

PlagiarismCheck.org

The selling point is that one submission answers both questions a teacher has — was this copied, and was this generated — instead of running two services. Ten years of operation and real LMS plugins put it ahead of the many single-page detectors that appeared in 2023. Treat the accuracy claim with the scepticism every AI detector deserves: the underlying signals are statistical and non-native writers get flagged disproportionately across this whole category.

Pros

  • Plagiarism and AI detection run on a single upload rather than two separate tools
  • Sentence-level output shows which passages triggered the score, not just a document percentage
  • Genuine LMS integrations across seven platforms, plus a Google Docs add-on and Chrome extension
  • OCR handles scanned or photographed submissions
  • Documented API for business use

Cons

  • The published '99% accuracy' figure is the vendor's own and is not independently verified
  • Institutional pricing is quote-only; the pricing page shows no numbers at all
  • No company jurisdiction is disclosed, which matters for student-data processing
  • AI detectors as a class produce false positives on formulaic and non-native writing

Turnitin

The incumbent for a reason: the submission database and the LMS integrations are what institutions buy, and no challenger matches either. Treat the AI-writing indicator as a prompt for a conversation, not a verdict; Turnitin itself now sells Clarity to show how a draft was written because a percentage alone keeps producing disputes, and the price only arrives after a sales call.

Pros

  • Largest comparison corpus of prior student submissions, which web-only checkers lack
  • LTI integrations with the major learning management systems
  • One contract covers grading, originality, exams and manuscript screening
  • Clarity adds process evidence about how a draft was written, not just a flag

Cons

  • No public pricing; every deal is an institutional quote
  • AI-writing detection produces false positives and has been contested by students
  • Student papers feed the comparison database, a long-running data-rights objection
  • The public site refuses automated fetches, which complicates monitoring

Which one fits

Choose PlagiarismCheck.org if you need

  • Teachers and departments already inside Canvas, Moodle or Google Classroom
  • Editors who need a similarity report and an AI-likelihood read in the same pass
  • Institutions that need OCR because submissions arrive as photographs

Choose Turnitin if you need

  • Universities and school districts that need similarity checking wired into Canvas, Moodle, Blackboard or D2L
  • Publishers and research offices screening manuscripts through iThenticate
  • Assessment teams that want grading, proctored exams and integrity from one vendor

PlagiarismCheck.org vs Turnitin: the questions people ask

Is PlagiarismCheck.org cheaper than Turnitin?

PlagiarismCheck.org starts at $2.08/mo; Turnitin prices on request, so a quote is the only way to compare.

Which has a public API, PlagiarismCheck.org or Turnitin?

Both ship a public API, so either can be built on; the fact table above shows the platforms each one runs on.

More comparisons

All PlagiarismCheck.org alternatives →Browse all AI Detection & Humanizers →