Content SEO Analysis, Before You Publish

The score is a weighted, fully algorithmic blend of on-page factors: primary and secondary keyword usage, keyword density, readability, heading hierarchy, content length, link signals, and meta quality. Each factor returns a sub-score, and the weighted total produces a single number from 0 to 100. Nothing is sent to an AI model for the free score, so it runs instantly in your browser.

A score of 70 or above is the green band and signals a draft that is well optimised and ready to publish. Scores from 40 to 69 are workable but have clear fixes worth making first. Below 40 means the draft is missing important signals, and the prioritised fix list will show you what to address.

There is no single right answer, but most articles that rank well for competitive informational keywords are between 1,200 and 2,500 words. Length should match the depth of the topic, not a target number. A precise how-to guide might rank at 800 words; a comprehensive topic cluster page may need 3,000. The tool scores content length as one signal but weights it against other factors so thin content in a long article is still flagged.

On-page SEO refers to all the optimisation signals within the content and HTML of a page itself — as opposed to off-page factors like backlinks. It includes keyword placement in the title, headings, and body; meta title and description quality; URL structure; internal linking; readability; and structured data. This tool focuses entirely on on-page signals and scores them before you publish, so problems are caught before they affect rankings.

A meta description is the short summary that appears under your page title in search results. Google typically displays up to around 160 characters before truncating. A well-written meta description includes the target keyword, clearly states what the reader gets, and ends with an implicit or explicit call to action. The tool checks length and keyword presence and can generate suggested descriptions for you.

A good meta title puts the primary keyword as close to the start as possible, stays under 60 characters, and gives a clear reason to click. Avoid keyword stuffing — one natural use of the keyword plus a short benefit phrase is stronger than repeating the keyword twice. The title tag is one of the highest-weight on-page signals, so it is worth spending time on. The tool scores your title and flags if it is missing the keyword, too long, or too short.

The most effective changes are shorter sentences, shorter paragraphs, and replacing passive constructions with active ones. Aim for sentences that average under 20 words and paragraphs that are no longer than 4 lines. Use subheadings to break long sections, and convert multi-item sentences into bulleted lists. The annotated draft highlights the specific sentences and paragraphs that are dragging your readability score down so you can fix them directly.

Yes. The core analysis, scoring, readability, keyword checks, and AI-visibility signals are free on the Reader tier with no account required. Editor adds keyword research data and saved analyses behind a free email sign-up, and Publisher unlocks AI rewrites and integrations at $15/mo.

Yoast runs inside WordPress and checks a post you are already editing in the CMS. This tool runs in any browser before you publish, so you can check a draft in Google Docs, Notion, or a plain text file without a plugin. It also scores AI-search citability, which traditional WordPress SEO plugins do not measure.

For pre-publish content checking, yes. You get keyword analysis, readability scoring, internal link prompts, and meta optimisation without an annual licence tied to one WordPress site. Yoast Premium remains useful for in-CMS redirect management and sitemap features, so many writers use this tool for drafting and keep a basic plugin for site plumbing.

It covers the same core job of optimising content against a target keyword and related terms, at a fraction of the cost per article. Surfer and Clearscope offer deep SERP-wide term corpora aimed at large agencies, while this tool focuses on fast, accurate pre-publish scoring plus AI-search visibility. For most freelancers and in-house writers it removes the need for a high monthly subscription.

AEO, or Answer Engine Optimisation, is the practice of structuring content so AI answer engines can quote it directly. The tool scans for citation-friendly signals like clear definitions, direct question-and-answer phrasing, factual statements, lists, and structured data. It then reports the signals you already have and the ones to add to improve your odds of being cited by ChatGPT, Perplexity, and Google AI Overviews.

Keyword density is how often your target keyword appears relative to total word count, expressed as a percentage. Too low and the page may not clearly signal its topic, too high and it can read as stuffed and unnatural. The tool flags a healthy range and shows you where the keyword appears so you can adjust placement rather than just frequency.

LSI keywords are the related terms and phrases that naturally surround a topic and help search engines confirm what your content is about. For an article on content SEO analysis, that includes terms like on-page optimisation, readability, and meta description. The tool detects which related terms you already use and highlights relevant ones you are missing.

Yes. The tool is a web app, so there is nothing to install and no CMS dependency. Paste a draft from any source, set your keyword, and analyse it directly in the browser.

Yes, it is well suited to agency and freelance workflows where you QA writer output before delivery. On paid plans you can save analyses, track revisions, and share a scored report with clients. There is no per-site licence, so you can check work for any number of clients.

The AI rewrite feature, available on the Publisher tier, rewrites a flagged paragraph to improve a specific weakness such as readability or keyword integration. It returns a clear before-and-after diff so you can see exactly what changed and accept or reject each suggestion. You stay in control, and the rescore updates as you apply changes.