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Head-to-head · Plagiarism Checkers

Turnitin AI Writing Detection vs Noplag

  • Updated Oct 2026
  • Both researched from official sources
  • 5 checks side by side
Higher score Turnitin AI Writing Detection #1 in Plagiarism Checkers 9.4/10 Pricing on request ✓ 4 of 4 features Visit Turnitin
Noplag #9 in Plagiarism Checkers 8.4/10 Free plan · 14-day trial Free planFree trial✓ 4 of 4 features Visit Noplag

Turnitin AI Writing Detection leads on 0 checks, Noplag on 1, and 4 are even. Who comes out ahead on the 5 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreTurnitin AI Writing Detection · 9.4/10
  • Free planonly Noplag
  • Free trialonly Noplag

Turnitin AI Writing Detection scores higher on our rubric for plagiarism checkers: 9.4 against 8.4 out of 10; our editors rank them #1 and #9.

Noplag offers free plan; Turnitin AI Writing Detection doesn't.

Turnitin AI Writing Detection is the better fit for institutions focused on AI-writing detection. Noplag is the better fit for self-hosters needing open-source flexibility.

  • Turnitin AI Writing Detection fits best

    Institutions focused on AI-writing detection

  • Noplag fits best

    Self-hosters needing open-source flexibility

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 AI Writing Detection 9.4/10 Visit ↗ Noplag 8.4/10 Visit ↗
At a glance
Editor score 9.4 8.4
Ranking #1 in Plagiarism Checkers #9 in Plagiarism Checkers
Best for Institutions focused on AI-writing detection Self-hosters needing open-source flexibility
Pricing model Paid Free plan + paid
Starting price — $9.99/mo
Free plan — ✓ (best)
Free trial — 14 days
Deployment Cloud Cloud, Desktop
Platforms Web Web, Windows, macOS, Linux
Integrations 14 integrations 4 integrations
Features Turnitin AI Writing Detection 4/4 · Noplag 4/4
Web source matching ✓ ✓
Academic source matching ✓ ✓
API access ✓ ✓
LMS integration ✓ ✓
Specs
Supported languages Not checked yet 5 languages
Word limit Not checked yet 2500 words
Report export formats PDF PDF
Our review
Pros
  • Highlights predicted AI-generated segments with an overall percentage
  • Detects AI-paraphrased or bypassed English text
  • Integrates with major LMS platforms and exports PDF or CSV reports
  • Open-source Apache 2.0 engine supports self-hosting
  • Checks web, academic, Common Crawl, Wikipedia, and proprietary sources
  • REST API, webhooks, and LTI 1.3 LMS integrations
Cons
  • No free plan for individual or self-serve evaluation
  • Pricing is quote-based and depends on institution size and requirements
  • Focused on AI-writing detection rather than conventional similarity checking
  • Verified checking language coverage is limited to five languages
  • Free plan allows 3 checks per month with 2,500 words per check
  • Does not currently include AI-generated-text detection
Our verdict

Turnitin AI Writing Detection is an institutional feature and add-on for identifying text that may have been generated or modified by generative AI tools. It is designed for educators and academic-integrity teams handling assignments…

Read the review →

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

Read the review →
  1. Turnitin AI Writing DetectionPlagiarism Checkers 9.4Pricing on request
  2. NoplagPlagiarism Checkers 8.4Free plan · 14-day trial

Strengths and trade-offs

  • Turnitin AI Writing Detection — where it wins

    • Highlights predicted AI-generated segments with an overall percentage
    • Detects AI-paraphrased or bypassed English text
    • Integrates with major LMS platforms and exports PDF or CSV reports

    Where it doesn't

    • No free plan for individual or self-serve evaluation
    • Pricing is quote-based and depends on institution size and requirements
    • Focused on AI-writing detection rather than conventional similarity checking

  • Noplag — where it wins

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

    Where it doesn't

    • Verified checking language coverage is limited to five languages
    • Free plan allows 3 checks per month with 2,500 words per check
    • Does not currently include AI-generated-text detection
  • Turnitin AI Writing Detection9.4/10 · Pricing on request

    A focused institutional tool for identifying text that may be AI-generated or modified.

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

    An open-source checker with self-hosting, academic matching, APIs, and LMS integrations.

    Visit NoplagFull verdict →

More comparisons

All plagiarism checkers comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update