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Head-to-head · AI Plagiarism Checkers

iThenticate vs Noplag

  • Updated Oct 2026
  • Both researched from official sources
  • 2 checks side by side
Higher score iThenticate #7 in AI Plagiarism Checkers 8.6/10 Paid ✓ 1 of 3 features Visit iThenticate
Noplag #8 in AI Plagiarism Checkers 8.4/10 Free plan · 14-day trial Free planFree trial✓ 1 of 3 features Visit Noplag

iThenticate leads on 0 checks, Noplag on 1, and 1 is even. Who comes out ahead on the 2 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreiThenticate · 8.6/10
  • Free planonly Noplag
  • Free trialonly Noplag

iThenticate scores higher on our rubric for ai plagiarism checkers: 8.6 against 8.4 out of 10; our editors rank them #7 and #8.

Noplag offers free plan; iThenticate doesn't.

iThenticate is the better fit for publishers and organizations checking submissions. Noplag is the better fit for technical users wanting open-source self-hosting.

  • iThenticate fits best

    Publishers and organizations checking submissions

  • Noplag fits best

    Technical users wanting open-source self-hosting

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Side by side

Feature iThenticate 8.6/10 Visit ↗ Noplag 8.4/10 Visit ↗
At a glance
Editor score 8.6 8.4
Ranking #7 in AI Plagiarism Checkers #8 in AI Plagiarism Checkers
Best for Publishers and organizations checking submissions Technical users wanting open-source self-hosting
Pricing model Paid Free plan + paid
Starting price $125 one-time $9.99/mo
Free plan — ✓ (best)
Free trial — 14 days
Deployment Cloud Cloud, Desktop
Platforms Web Web, Windows, macOS, Linux
Integrations 3 integrations 4 integrations
Features iThenticate 1/3 · Noplag 1/3
LMS integrations Not checked yet Not checked yet
API access ✓ ✓
AI writing check Not checked yet Not checked yet
Specs
Source coverage Not checked yet Not checked yet
Maximum document words Not checked yet Not checked yet
Supported file formats Not checked yet Not checked yet
Report export Not checked yet Not checked yet
Our review
Pros
  • Checks web pages, publications, journals, Crossref, and submitted works
  • Provides comparison views, highlighted reports, and PDF downloads
  • Supports organizational API access, LTI, and SSO integrations
  • 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
  • No free plan is available
  • Individual access starts at a $125 one-time purchase
  • Organization pricing is customized rather than published
  • 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

iThenticate is a web-based similarity-checking product from Turnitin for scholarly publishers, research departments, institutions, authors, and researchers. It compares manuscripts and other documents with internet pages, archived web…

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. iThenticateAI Plagiarism Checkers 8.6Paid
  2. NoplagAI Plagiarism Checkers 8.4Free plan · 14-day trial

Strengths and trade-offs

  • iThenticate — where it wins

    • Checks web pages, publications, journals, Crossref, and submitted works
    • Provides comparison views, highlighted reports, and PDF downloads
    • Supports organizational API access, LTI, and SSO integrations

    Where it doesn't

    • No free plan is available
    • Individual access starts at a $125 one-time purchase
    • Organization pricing is customized rather than published

  • 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

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