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Head-to-head · AI Plagiarism Checkers

StrikePlagiarism vs Turnitin Similarity

  • Updated Oct 2026
  • Both researched from official sources
  • 4 checks side by side
Higher score StrikePlagiarism #1 in AI Plagiarism Checkers 9.4/10 Paid ✓ 1 of 3 features Try StrikePlagiarism
Turnitin Similarity #3 in AI Plagiarism Checkers 9.2/10 Pricing on request ✓ 3 of 3 features Visit Turnitin

StrikePlagiarism leads on 0 checks, Turnitin Similarity 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 scoreStrikePlagiarism · 9.4/10
  • Most featuresTurnitin Similarity · 3 of 3

StrikePlagiarism scores higher on our rubric for ai plagiarism checkers: 9.4 against 9.2 out of 10; our editors rank them #1 and #3.

StrikePlagiarism is the better fit for academic institutions needing broad originality checks. Turnitin Similarity is the better fit for institutions prioritizing established similarity workflows.

  • StrikePlagiarism fits best

    Academic institutions needing broad originality checks

  • Turnitin Similarity fits best

    Institutions prioritizing established similarity workflows

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Side by side

Feature StrikePlagiarism 9.4/10 Visit ↗ Turnitin Similarity 9.2/10 Visit ↗
At a glance
Editor score 9.4 9.2
Ranking #1 in AI Plagiarism Checkers #3 in AI Plagiarism Checkers
Best for Academic institutions needing broad originality checks Institutions prioritizing established similarity workflows
Pricing model Paid Paid
Starting price €2.33/unit usage-based Pricing on request
Free plan — Not checked yet
Free trial — —
Deployment Cloud, Self-hosted Cloud
Platforms Web Web
Support Email, Phone, Tickets · 24/7 Docs
Compliance GDPR, ISO 27001 SOC 2, GDPR
Integrations 7 integrations 4 integrations
Built for Small business, Mid-market, Enterprise Mid-market, Enterprise
Features StrikePlagiarism 1/3 · Turnitin Similarity 3/3
LMS integrations Not checked yet ✓ (best)
API access ✓ ✓
AI writing check Not checked yet ✓ (best)
Specs
Source coverage Not checked yet Web_academic_and_publisher
Maximum document words Not checked yet Not checked yet
Supported file formats Not checked yet DOC, DOCX, XLS, XLSX, PPT, PPTX, PostScript, PDF, HTML, HWP, RTF, ODT, WordPerfect, TXT
Report export Not checked yet Pdf
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
  • Compares work against student, web, scholarly, and publisher content
  • Provides match groups, source comparisons, filtering, and integrity flags
  • Supports LMS workflows, PDF reports, and API submission and retrieval
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
  • Institutional pricing requires contacting sales
  • AI-writing detection requires the Turnitin Originality add-on
  • Designed for institutional workflows rather than standalone individual use
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 →

Turnitin Similarity is an institutional originality-checking product for schools, colleges, universities, instructors, administrators, and students. It compares submissions against student papers, current and archived web pages, scholarly…

Read the review →
  1. StrikePlagiarismAI Plagiarism Checkers 9.4Paid
  2. Turnitin SimilarityAI Plagiarism Checkers 9.2Pricing on request

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

  • Turnitin Similarity — where it wins

    • Compares work against student, web, scholarly, and publisher content
    • Provides match groups, source comparisons, filtering, and integrity flags
    • Supports LMS workflows, PDF reports, and API submission and retrieval

    Where it doesn't

    • Institutional pricing requires contacting sales
    • AI-writing detection requires the Turnitin Originality add-on
    • Designed for institutional workflows rather than standalone individual use

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