Compare your page against up to five competitor URLs and see the entities, headings, phrases, and schema types that two or more of them share and your page is missing.
A content gap analysis compares your page against the pages already ranking for your term and reports the subject matter they cover that you do not. The unit of comparison is the copy itself: the things it names, the questions it answers, the sections it is built from. A page can be technically flawless and still lose to a page that simply says more about the subject, and that difference is what this content gap check measures.
The tool fetches each competitor URL you paste and pulls four things from every page: the named entities in the prose, resolved against Wikidata so they are real things rather than capitalized words; every H2 and H3 section heading; every one, two, and three word phrase used more than once; and every schema.org type declared in JSON-LD. It then compares that set against your page and reports only what multiple competitors agree on, alongside your word count and heading count against their median.
A keyword gap compares which search terms two domains rank for; a content gap compares what is written on two pages. Keyword gap tools read a ranking database and hand you a list of terms, which tells you that demand exists but not what to do about it. Content gap analysis reads the pages themselves, so the output is the missing subject matter: the entity nobody on your page mentions, the section every competitor includes, the schema type they all declare and you do not.
Search your target term, open the pages ranking above you, and paste their URLs here. Requiring agreement is what separates a gap from a coincidence, so this seo content gap analysis only flags a topic when at least half the competitors you supplied carry it. One competitor mentioning a tool is that writer's preference; four competitors mentioning it is a property of the subject, and its absence from your page is a real hole.
Topical authority is earned by covering a subject completely enough that search engines treat you as a reliable source on it, and every unclosed content gap is a piece of that subject you have not covered. This is also why thin pages stall: a page can target the right term, load quickly, and still rank below a competitor whose copy answers three questions yours never raises.
Search engines resolve a page to the entities and concepts inside it rather than matching strings, which is what semantic SEO means in practice. Naming the specific things a subject requires, the products, the standards, the organizations, is how a page proves coverage, and it is also how ChatGPT, Perplexity, and Gemini decide which page to quote. A missing entity is therefore two losses at once: a weaker topical signal in Google, and one less reason for an answer engine to cite you.
Three to five gives a reliable consensus without drowning the result in noise. Below three, a single unusual competitor can distort the entire list; above five, the shared set narrows to the obvious and stops teaching you anything. Pick the pages actually ranking for your term rather than the brands you consider rivals, because the SERP decides who your competition is on that query.
Work an SEO content audit in this order: missing sections first, then missing entities, then vocabulary. A missing H2 is a whole question your page never answers, so it is worth more than any single phrase, and adding it usually pulls the related entities and vocabulary in behind it. Schema differences come last and cost the least: declaring the Organization or Article type every competitor declares is a few lines of JSON-LD, not a rewrite.
A content gap is a topic, entity, section, or phrase that the pages ranking for your target term all cover and your page does not. It is a gap in coverage rather than a gap in keywords: the missing thing is subject matter your readers and search engines expect to find, such as a named tool, a pricing section, or a definition every competitor states.
Compare your page against the pages already ranking for your target term. Pull the entities each one names, the H2 and H3 sections each one uses, the phrases each one repeats, and the schema types each one declares, then keep only what two or more competitors share. Anything on that shared list and absent from your page is a content gap worth closing.
A keyword gap compares which search terms two domains rank for, using a keyword database. A content gap compares what is actually written on two pages: the entities, headings, phrases, and schema in the copy itself. Keyword gap tools tell you a term exists; content gap analysis tells you what to write.
Between three and five. Two pages can agree by coincidence, so a shared topic proves little. At three or more, a subject that several independent pages all cover is a property of the topic rather than one writer's preference, which is why this tool only reports a gap when at least half the competitors you supply share it.
Yes. Enter your page URL and up to five competitor URLs and see the missing entities, sections, phrases, and schema types at no cost, with no sign up.