Free SEO Content Optimization Analyzer
Write or paste your content, add your focus keyword, and get a live score modeled on Rank Math, Yoast and All in One SEO’s own public scoring logic — readability, keyword placement, passive voice, transition words and internal/external links — before you ever hit publish.
This tool runs a simulation of Rank Math, Yoast and AIOSEO’s publicly documented scoring rules — it does not connect to those plugins and results may differ from what you see inside WordPress. Nothing you type is sent anywhere; the analysis runs entirely in your browser.
Check your draft against the same checklist your client’s SEO plugin will run, before you deliver it.
Flags the passive voice, long sentences and low transition-word usage that make AI drafts read as robotic — fix them before publishing.
A pre-publish checklist for keyword placement, meta description and readability without installing a plugin.
A shared, consistent standard for anyone on the team writing web copy, regardless of which plugin the live site actually runs.
A high SEO score and content that actually sounds human are not the same thing — and chasing one at the expense of the other is how AI-assisted writing ends up sounding stiff. The readability checks in this tool exist specifically to catch that: sentences that run too long, passive constructions that distance the reader from the action, and a lack of the small transition words that make writing feel like it was spoken by a person rather than assembled by a machine.
- Use the Auto-Fix suggestion on flagged sentences as a starting point, then rewrite in your own voice — don’t just accept the split verbatim.
- Aim for passive voice under 10% and transition words over 30% — both signal writing that flows the way people actually talk.
- A perfect 100 score with robotic phrasing will still read as robotic. Treat the score as a floor to clear, not the finish line.
Run the check before you consider a draft finished, not after. Start with the focus keyword and title \u2014 those carry the heaviest weight in every mode \u2014 then work down through readability last, since rewriting for readability after you\u2019ve locked keyword placement tends to preserve both. If a check stays red after a genuine rewrite attempt, look at whether the keyword itself fits the content naturally; forcing a phrase that doesn\u2019t belong usually costs more in readability than it gains in keyword coverage.
Writers producing content at volume \u2014 agencies, in-house teams publishing weekly, freelancers juggling several clients on different plugins \u2014 get the most out of running every draft through all three modes before delivery. A piece that clears Rank Math, Yoast and AIOSEO\u2019s checklists at once is far less likely to trigger a client\u2019s "why is my SEO score low" question after it goes live.
This analyzer is an independent simulation built from each plugin’s publicly documented scoring criteria. It is not affiliated with, endorsed by, or connected to any of them — if you run WordPress, the actual plugin remains the source of truth for your live site.
The WordPress SEO plugin whose default checklist this tool’s "Rank Math" mode is modeled on.
Visit official siteThe original SEO analysis plugin \u2014 its readability and keyphrase checks inspired this tool’s "Yoast" mode.
Visit official siteA widely used alternative WordPress SEO plugin \u2014 its title and readability checks inform this tool’s "AIOSEO" mode.
Visit official siteNo. This tool independently recreates each plugin\u2019s publicly documented checklist logic in the browser. It is a close approximation for pre-publish planning, not a live connection to WordPress or those plugins\u2019 actual codebases \u2014 your installed plugin remains the authority for your live site.
No. Every check runs in JavaScript inside your own browser tab. Nothing you write is sent to JustMarketo or anywhere else unless you choose to submit it through the review form below.
A high score confirms the mechanical checklist is satisfied \u2014 keyword placement, length, link counts. It cannot judge voice, specificity or whether the piece actually says something worth reading. Treat a full score as a floor you\u2019ve cleared, then edit the phrasing yourself for tone.
Match whichever plugin the destination site actually runs, since each weighs checks slightly differently \u2014 Yoast leans harder on readability and transition words, Rank Math weighs keyword placement more heavily, and AIOSEO puts more emphasis on title length. If you don\u2019t know, Rank Math\u2019s checklist is the most commonly used default.
Yes. No signup, no usage limit, no card required to use the analyzer itself. Sharing your email only unlocks the optional free human review from our content team.
Want a real person to review it too?
This tool gives you an instant, automated signal. Send us the piece and one of our content strategists will give you a free, honest read on what a score alone can’t catch — tone, structure, and whether it actually answers the searcher’s question.
No cost, no obligation — we’ll reply with specific notes within 24 hours.
A score gives you a signal. A strategist gives you a plan.
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