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Head-to-head · AI Plagiarism Checkers

Turnitin Originality vs Noplag

  • Updated Oct 2026
  • Both researched from official sources
  • 4 checks side by side
Higher score Turnitin Originality #2 in AI Plagiarism Checkers 9.3/10 Pricing on request ✓ 3 of 3 features Visit Turnitin
Noplag #8 in AI Plagiarism Checkers 8.4/10 Free plan · 14-day trial Free planFree trial✓ 1 of 3 features Visit Noplag

Turnitin Originality leads on 0 checks, Noplag on 0, and 4 are even. Who comes out ahead on the 4 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreTurnitin Originality · 9.3/10
  • Free planonly Noplag
  • Free trialonly Noplag
  • Most featuresTurnitin Originality · 3 of 3

Turnitin Originality scores higher on our rubric for ai plagiarism checkers: 9.3 against 8.4 out of 10; our editors rank them #2 and #8.

Turnitin Originality is the better fit for institutions needing AI and authorship safeguards. Noplag is the better fit for technical users wanting open-source self-hosting.

  • Turnitin Originality fits best

    Institutions needing AI and authorship safeguards

  • Noplag fits best

    Technical users wanting open-source self-hosting

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Side by side

Feature Turnitin Originality 9.3/10 Visit ↗ Noplag 8.4/10 Visit ↗
At a glance
Editor score 9.3 8.4
Ranking #2 in AI Plagiarism Checkers #8 in AI Plagiarism Checkers
Best for Institutions needing AI and authorship safeguards Technical users wanting open-source self-hosting
Pricing model Paid Free plan + paid
Starting price Pricing on request $9.99/mo
Free plan Not checked yet ✓ (best)
Free trial — 14 days
Deployment Cloud Cloud, Desktop
Platforms Web Web, Windows, macOS, Linux
Integrations 9 integrations 4 integrations
Features Turnitin Originality 3/3 · Noplag 1/3
LMS integrations ✓ (best) Not checked yet
API access ✓ ✓
AI writing check ✓ (best) Not checked yet
Specs
Source coverage Web_academic_and_publisher Not checked yet
Maximum document words Not checked yet Not checked yet
Supported file formats DOC, DOCX, PDF, PPTX, PPSX, XLS, XLSX, PS, RTF, HTM, HTML, WPD, ODT, TXT, HWP, HWPX Not checked yet
Report export Pdf Not checked yet
Our review
Pros
  • Detects AI writing, paraphrasing, and bypassing with percentage indicators.
  • Connects with major LMS platforms, LTI, Microsoft Teams, and Google Classroom.
  • Adds authorship, metadata, similarity, citation, and PDF report capabilities.
  • Checks live web, academic papers, Common Crawl, Wikipedia, and proprietary databases
  • Open-source Apache 2.0 engine supports self-hosting
  • REST API, webhooks, LTI 1.3, and major LMS integrations
Cons
  • Institutional subscriptions require contacting sales rather than choosing a public plan.
  • The product is sold to educational institutions, not directly to individuals.
  • Product details may vary by license and market.
  • No AI-generated-text detection
  • Free and paid checks cap documents at 2,500 to 50,000 words
  • Advanced features require paid plans or Enterprise deployment
Our verdict

Turnitin Originality is an institutional academic-integrity solution for educators and education providers. It combines similarity checking with AI-writing detection, AI paraphrasing and bypassing detection, authorship reports, submission…

Read the review →

Noplag is a plagiarism checker for students, educators, researchers, publishers, and businesses. It accepts pasted text, document uploads, and URLs, then compares content with live web pages, academic papers, Common Crawl, Wikipedia, and…

Read the review →
  1. Turnitin OriginalityAI Plagiarism Checkers 9.3Pricing on request
  2. NoplagAI Plagiarism Checkers 8.4Free plan · 14-day trial

Strengths and trade-offs

  • Turnitin Originality — where it wins

    • Detects AI writing, paraphrasing, and bypassing with percentage indicators.
    • Connects with major LMS platforms, LTI, Microsoft Teams, and Google Classroom.
    • Adds authorship, metadata, similarity, citation, and PDF report capabilities.

    Where it doesn't

    • Institutional subscriptions require contacting sales rather than choosing a public plan.
    • The product is sold to educational institutions, not directly to individuals.
    • Product details may vary by license and market.

  • Noplag — where it wins

    • Checks live web, academic papers, Common Crawl, Wikipedia, and proprietary databases
    • Open-source Apache 2.0 engine supports self-hosting
    • REST API, webhooks, LTI 1.3, and major LMS integrations

    Where it doesn't

    • No AI-generated-text detection
    • Free and paid checks cap documents at 2,500 to 50,000 words
    • Advanced features require paid plans or Enterprise deployment
  • Turnitin Originality9.3/10 · Pricing on request

    A broad institutional suite for AI writing, authorship, similarity, and citation review.

    Visit TurnitinFull verdict →
  • Noplag8.4/10 · Free plan · 14-day trial

    A self-hostable plagiarism checker with broad source coverage but no AI detection.

    Visit NoplagFull verdict →

More comparisons

All AI plagiarism checkers comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update