HUBLO Duplicate Content Auditor

Sites that publish for years end up competing with themselves: the 2019 guide and the 2023 rewrite, the category page and the pillar post, three near-identical round-ups. You know they are in there. What you do not know is which one to keep, and what you would quietly lose by deleting the other. This plugin answers both, and changes nothing until you say so. How it works

1. Scan. Every post is compared against every other post that could plausibly match it.
2. Compare. For each overlapping pair: which version is stronger, on what evidence, and what only the other one contains.
3. Plan. A merge and redirect plan you can export and act on — by hand, with a redirect plugin you already use, or with Pro.

What you get

• Every overlapping pair, ranked. Sorted by how much they overlap, banded near identical, strong or partial.
• A canonical suggestion that shows its working. Content length, publication date, comment activity, inbound internal links, featured image and slug quality are scored side by side, so you can see why one version was suggested — and disagree.
• What you would lose. The question before any merge is what only the other version has. The audit lists exactly those sections.
• A redirect plan before anything is created. Source path, target path, status code.
• CSV export. The duplicate report and the redirect plan, in a shape other redirect plugins can import.

Similarity detection that assumes spaces between words fails badly on Japanese, Chinese and Korean. This plugin detects the script and switches from word shingles to character shingles, so CJK content is compared properly instead of producing noise. What it will not do

• Read-only. It never merges, deletes, rewrites, trashes or redirects anything. Every destructive step stays with you.
• Nothing leaves your server. No external service is contacted, no analytics, no telemetry.
• No account, no API key. Install it and use it.
• Tidy. Scan data lives in three tables of its own, which are removed when you uninstall.

This plugin, and the Pro plugin Free is a complete job: find the overlap, understand it, decide, export the plan. It is not a trial — nothing expires and no feature stops working. A separate Pro plugin, distributed outside WordPress.org and not bundled here, carries the plan out. This plugin, free, does all of the analysis:

• Finds every overlapping pair and ranks them
• Shows why one version is suggested, signal by signal
• Shows what only the other version contains
• Previews the merge and the redirect
• Exports the whole plan as CSV

Pro carries the plan out, inside WordPress:

• Performs the merge
• Creates the 301 redirects
• Rewrites internal links pointing at the retired post
• Revision backup, rollback and conflict detection

Matches are banded — near identical, strong overlap, partial overlap — because a bare percentage is harder to act on than a category. Try it without installing A WordPress Playground blueprint ships with this plugin. When the directory offers a Live Preview for it, that preview boots a temporary WordPress in your browser, seeded with posts that overlap on purpose, and opens straight on the results. Nothing is installed on your own site. Full documentation, worked examples and the Free/Pro comparison: https://hublo-wp.com/free-plugins/duplicate-content-auditor/

1.0.0

• First release.
• Near-duplicate detection with CJK-aware shingling.
• Canonical suggestion with visible scoring, section comparison, redirect plan and CSV export.