Badi Jones

Duplicate Content Cure is an extremely simple plugin that makes WordPress more Search Engine 
friendly (And therefore improving SEO). It does this by preventing search engine spiders/bots 
from accessing pages like Archives, Tags, and Categories, which tend to contain duplicated content 
from elsewhere on your site. This is achieved by adding nofollow, noindex to 
these problem pages.
Duplicate Content Cure doesn’t have a lot of features that other SEO plugins have, but 
it also is lightning fast by comparison.

Duplicate Content Cure

Duplicate content cure is a simple plugin that improves SEO by preventing search engines from indexing pages that contain duplicate content.

wordbinaryapp

WordBinary Self Plagiarism Checker adds a simple text comparison tool to your WordPress site using the shortcode [wbspc_self_plagiarism_checker].
Visitors can paste two separate texts, click Check, and review matching phrase combinations of four or more consecutive words. Matching sections are highlighted in both documents.
The tool runs in the visitor’s browser. It does not upload, save, store, download, sell, share, or transmit pasted text. The plugin does not add public external links, tracking scripts, analytics, remote code, or third-party services.
This tool provides an indicative phrase similarity check only and does not replace a formal plagiarism report.
Developer and owner: Concepts and Context, registered at wordbinary.com.

WordBinary Self Plagiarism Checker

Add a local browser-based self plagiarism checker that compares two pasted texts and highlights similar phrases.

Duplicate Content Cure vs WordBinary Self Plagiarism Checker