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MSEO Merlin

The SEO plugin that works with Yoast and RankMath — not against them.

BUILT BY DEVEBO · MMXXVI
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Free forever · No credit card

The SEO plugin that works with Yoast and RankMath —

not against them.

Run 43 expert SEO checks. Auto-fix 37 of them. Built for WordPress agencies and freelancers managing real client sites.

Start Free →See what's checked
v2.4.1 · WP 6.4+ · works with Yoast & RankMath
FIG.01 — SITE AUDIT MATRIXcheckedissue detected43 checks · 7 fixes available
Trusted at
NorthStar Studio
Clarity & Co
Maven Digital
Roost Agency
Form Function
Drift Labs
01Companion

You already have an SEO plugin. Keep it.

SEO Merlin reads what Yoast and RankMath already give you and augments the gaps — AI search readiness, structured data depth, technical fixes neither plugin auto-applies. Standalone mode also available.

FIG.02 — COMPANION TOPOLOGYMSEO MERLINYoastactiveRankMathactiveAIOSEOQ3 2026SEOPressQ3 2026readsaugmentsStandalone mode also available — works without any companion plugin.
Yoast Free + Premium

Already running Yoast?

We read your meta. We add what's missing. Zero conflict.

RankMath Free + Pro

Running RankMath?

Same — we layer on top. RankMath stays the source of truth.

AIOSEO · SEOPress · Q3 2026

Running something else?

AIOSEO and SEOPress full support shipping Q3 2026. Standalone mode available today.

02What's inside

Six things you'll use every week.

43 expert checks across technical, content, structure, and AI readiness. 37 of them fix themselves with one click — and every fix is reversible.

43 / 43 Categories

43 SEO Checks

Crawlable depth across technical, content, links, schema, and AI readiness. Every check has a documented rationale.

beforeafter
37 Auto-Fixable

37 One-Click Fixes

We don't just diagnose. Apply fixes from the queue without leaving the dashboard. All reversible.

GEO · AEO · AIO

AI Search Ready

Optimize for Google AI Overviews, ChatGPT Search, Perplexity. Structured signals built for generative engines.

CSVPDFXLS
CSV · PDF · XLS

Free Audit Import

Pull in audits from Ahrefs, SEMrush, Screaming Frog. Unify everything into one fix queue.

Schema.org/Product

WooCommerce Native

Product schema, variant URLs, review markup, price metadata — all generated and validated.

∞ history

One-Click Undo

Every change is logged and reversible. Roll back a single fix or an entire batch from history.

03The dashboard

Inside wp-admin. Where you already work.

No external app, no separate login. SEO Merlin lives in the WordPress admin you already trust. Score, categories, fix queue — all on one screen.

wp-admin → seo-merlin → dashboard
Dashboard
Posts
Media
Pages
SEO Merlin7
↳ Dashboard
↳ Audits
↳ Fix Queue
↳ AI Search
↳ Settings
Site Audit

example.com

Last scan · 2 minutes ago · 247 URLs
SEO Score
87/100
↑ +12 since last scan
Technical
92
12/13 checks pass
Content
78
9/12 checks pass
Links
95
8/9 checks pass
AI Readiness
84
7/9 checks pass
Fix Queue · 7 items
5 auto-fixable
Technical
Missing canonical tags on 14 URLs
Content
Meta description over 160 chars on 6 pages
AI
No structured data (Article schema)
Content
H1 missing on /pricing
Links
Internal link to /old-blog returns 404
Technical
Image alt text missing on 23 images
AI
OpenGraph tags incomplete
04AI Search Era

Search is becoming generative. Be ready.

Google AI Overviews, ChatGPT Search, Perplexity — they cite the sites with structured, well-marked content. SEO Merlin reads your pages the way a generative engine does and surfaces what's missing.

GEO
Generative Engine Optimization
AEO
Answer Engine Optimization
AIO
AI Overview Optimization
FIG.03 — GENERATIVE SEARCH FIELDSGEOgenerative engineAEOanswer engineAIOAI overviewCONTENT
05Bring your own keys

No proxy. No markup. Your keys, your bill.

Most AI-SEO tools resell API access at 3–5× markup. We don't. Plug in your own Anthropic and DataForSEO keys; pay providers what providers charge. See exact spend per scan.

0%
Markup on API calls
~$0.04
Avg cost per full audit
FIG.04 — BYOK DATA PATHYour SiteWordPressYOUR API KEYAnthropicclaudeDataForSEOrank datadirect connection · no proxy · no markupPay providers what providers charge.
06How it works

From plugin install to fixes shipped — under five minutes.

STEP 01InstallOne-click WP installSTEP 02Scan43 checks in 90 secondsfixedSTEP 03FixOne-click, fully reversible
07Who it's for

Built for the people doing the work — not the people writing the playbooks.

P.01 — AGENCIES

Agencies

Audit and fix 10–50 client sites without context-switching. White-label exports.

P.02 — WOOCOMMERCEschema:Productprice · sku · review

WooCommerce owners

Product schema, variant SEO, and review markup that actually validates.

P.03 — DEVELOPERS$ wp seo:scanscanning 247 urls...[████████░░] 68%↳ 12 issues found↳ 9 auto-fixable$ _

Developers

WP-CLI, REST API, hooks, deterministic output. Audit at deploy time.

P.04 — BLOGGERS

Bloggers & creators

Optimize for AI Overviews and traditional search without the agency tooling cost.

08Pricing

One-time license. Lifetime updates.

No monthly fees on the plugin itself. Pay once per tier, get a year of updates and support — then keep using it forever. AI features use your own keys.

Starter
$79/lifetime
1 site
·43 SEO checks
·37 one-click fixes
·Yoast / RankMath companion
·WooCommerce schema
·CSV/PDF audit import
·Email support
Get Starter →
Most popular
Freelancer
$199/lifetime
5 sites
·Everything in Starter
·AI Search optimization (BYOK)
·White-label reports
·WP-CLI + REST API
·Bulk fix queue
·Priority support
Get Freelancer →
Agency
$349/lifetime
25 sites
·Everything in Freelancer
·Team seats (5)
·Client dashboards
·Scheduled scans
·Custom check authoring
·Slack support channel
Get Agency →
Final word

Your site has SEO problems
right now.

Find them in 90 seconds. Fix the auto-fixable ones in another two minutes. Free forever.

Start Free Audit →or browse the docs first
Free forever · No credit card · Installs in under a minute