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Head-to-head · AI Plagiarism Checkers

StrikePlagiarism vs Noplag

  • Updated Oct 2026
  • Both researched from official sources
  • 2 checks side by side
Higher score StrikePlagiarism #1 in AI Plagiarism Checkers 9.4/10 Paid ✓ 1 of 3 features Try StrikePlagiarism
Noplag #8 in AI Plagiarism Checkers 8.4/10 Free plan · 14-day trial Free planFree trial✓ 1 of 3 features Visit Noplag

StrikePlagiarism 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 scoreStrikePlagiarism · 9.4/10
  • Free planonly Noplag
  • Free trialonly Noplag

StrikePlagiarism scores higher on our rubric for ai plagiarism checkers: 9.4 against 8.4 out of 10; our editors rank them #1 and #8.

Noplag offers free plan; StrikePlagiarism doesn't.

StrikePlagiarism is the better fit for academic institutions needing broad originality checks. Noplag is the better fit for technical users wanting open-source self-hosting.

  • StrikePlagiarism fits best

    Academic institutions needing broad originality checks

  • 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 StrikePlagiarism 9.4/10 Visit ↗ Noplag 8.4/10 Visit ↗
At a glance
Editor score 9.4 8.4
Ranking #1 in AI Plagiarism Checkers #8 in AI Plagiarism Checkers
Best for Academic institutions needing broad originality checks Technical users wanting open-source self-hosting
Pricing model Paid Free plan + paid
Starting price €2.33/unit usage-based $9.99/mo
Free plan — ✓ (best)
Free trial — 14 days
Deployment Cloud, Self-hosted Cloud, Desktop
Platforms Web Web, Windows, macOS, Linux
Integrations 7 integrations 4 integrations
Features StrikePlagiarism 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, journals, repositories, publishers, and academic databases
  • Adds AI, translation, paraphrase, and text-manipulation detection
  • Supports LMS integrations, assignment workflows, reports, and REST API access
  • 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
  • Paid access starts at $2.5 per token rather than a monthly plan
  • Additional checking services may increase the final price
  • Free-plan terms may vary by region
  • 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

StrikePlagiarism is a web-based academic integrity system for universities, schools, publishers, researchers, and individual authors. It compares documents with open internet sources, scientific journals, academic repositories, university…

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. StrikePlagiarismAI Plagiarism Checkers 9.4Paid
  2. NoplagAI Plagiarism Checkers 8.4Free plan · 14-day trial

Strengths and trade-offs

  • StrikePlagiarism — where it wins

    • Checks web, journals, repositories, publishers, and academic databases
    • Adds AI, translation, paraphrase, and text-manipulation detection
    • Supports LMS integrations, assignment workflows, reports, and REST API access

    Where it doesn't

    • Paid access starts at $2.5 per token rather than a monthly plan
    • Additional checking services may increase the final price
    • Free-plan terms may vary by region

  • 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