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Head-to-head · Plagiarism Checkers

Crossref Similarity Check vs PlagiarismCheck.org

  • Updated Oct 2026
  • Both researched from official sources
  • 5 checks side by side
Higher score Crossref Similarity Check #2 in Plagiarism Checkers 9.2/10 Paid ✓ 3 of 4 features Visit Crossref
PlagiarismCheck.org #8 in Plagiarism Checkers 8.5/10 Free plan Free plan✓ 4 of 4 features Visit site

Crossref Similarity Check leads on 0 checks, PlagiarismCheck.org 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 scoreCrossref Similarity Check · 9.2/10
  • Free planonly PlagiarismCheck.org
  • Most featuresPlagiarismCheck.org · 4 of 4

Crossref Similarity Check scores higher on our rubric for plagiarism checkers: 9.2 against 8.5 out of 10; our editors rank them #2 and #8.

PlagiarismCheck.org offers free plan; Crossref Similarity Check doesn't.

Crossref Similarity Check is the better fit for publishers and journals checking manuscripts. PlagiarismCheck.org is the better fit for schools wanting affordable, feature-rich checking.

  • Crossref Similarity Check fits best

    Publishers and journals checking manuscripts

  • PlagiarismCheck.org fits best

    Schools wanting affordable, feature-rich checking

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 Crossref Similarity Check 9.2/10 Visit ↗ PlagiarismCheck.org 8.5/10 Visit ↗
At a glance
Editor score 9.2 8.5
Ranking #2 in Plagiarism Checkers #8 in Plagiarism Checkers
Best for Publishers and journals checking manuscripts Schools wanting affordable, feature-rich checking
Pricing model Paid Free plan + paid
Starting price — —
Free plan — ✓ (best)
Free trial — —
Deployment Cloud Cloud, Browser extension
Platforms Web Web, Chrome extension
Integrations 5 integrations 9 integrations
Features Crossref Similarity Check 3/4 · PlagiarismCheck.org 4/4
Web source matching ✓ ✓
Academic source matching ✓ ✓
API access ✓ ✓
LMS integration Not checked yet ✓ (best)
Specs
Supported languages Not checked yet Not checked yet
Word limit Not checked yet Not checked yet
Report export formats PDF PDF
Our review
Pros
  • Compares manuscripts with academic content and current or archived web pages
  • Detailed reports include scores, highlighted matches, filters, and PDF export
  • API access supports manuscript submission systems, including OJS
  • Checks web, scholarly, institutional, and public-resource content
  • Detects rearrangements, synonym substitutions, and hidden characters
  • Supports PDF reports, authorship verification, APIs, and major LMSs
Cons
  • Available only to eligible Crossref members
  • Annual service fee is required
  • First 100 documents are limited to 25,000 words each
  • Basic pricing is tied to 20-page usage
  • Individual plans use several pricing structures
  • Advanced and Pro institutional plans use quote-based pricing
Our verdict

Crossref Similarity Check is a manuscript-screening service for Crossref members, powered by Turnitin’s iThenticate software. Publishers and editors can upload manuscripts or submit them through a manuscript submission system using an API.…

Read the review →

PlagiarismCheck.org is a browser-based plagiarism and AI detection service for students, educators, institutions, writers, and content creators. It compares submitted text with publicly available web resources, scholarly content,…

Read the review →
  1. Crossref Similarity CheckPlagiarism Checkers 9.2Paid
  2. PlagiarismCheck.orgPlagiarism Checkers 8.5Free plan

Strengths and trade-offs

  • Crossref Similarity Check — where it wins

    • Compares manuscripts with academic content and current or archived web pages
    • Detailed reports include scores, highlighted matches, filters, and PDF export
    • API access supports manuscript submission systems, including OJS

    Where it doesn't

    • Available only to eligible Crossref members
    • Annual service fee is required
    • First 100 documents are limited to 25,000 words each

  • PlagiarismCheck.org — where it wins

    • Checks web, scholarly, institutional, and public-resource content
    • Detects rearrangements, synonym substitutions, and hidden characters
    • Supports PDF reports, authorship verification, APIs, and major LMSs

    Where it doesn't

    • Basic pricing is tied to 20-page usage
    • Individual plans use several pricing structures
    • Advanced and Pro institutional plans use quote-based pricing
  • Crossref Similarity Check9.2/10 · Paid

    A focused manuscript-screening service with academic matching, reports, filters, and API access.

    Visit CrossrefFull verdict →
  • PlagiarismCheck.org8.5/10 · Free plan

    A flexible checker with academic matching, authorship verification, reports, APIs, and LMS integrations.

    Visit siteFull 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