How to do a content gap analysis (5 steps, with or without tools)

A content gap analysis answers one question: what do the pages that outrank you cover that your page does not? Done right, it turns the vague advice “write more content” into a short, prioritized list of missing topics with evidence behind each one. Here is a method you can run in an afternoon by hand — or in minutes with a tool.

Step 1: collect the real SERP

Search your target query in the country and language you actually sell in, from a private window. The top 5–10 organic results are your competitor set. Resist the urge to hand-pick “similar” sites: the gap that matters is against the pages Google rewards today, and those are often not the companies you consider rivals — they may be publishers, forums or documentation pages. Our guide to competitor SERP analysis covers how to read that result set.

Step 2: inventory what each ranking page covers

For each competitor, list the subtopics, entities and questions it answers. Subheadings are a fast proxy, but read the paragraphs too — a lot of coverage never makes it into an H2. Note the format as well: comparison tables, step lists, calculators, original data. Format is content.

Step 3: diff the inventory against your page

Mark every topic as covered, thin, or missing on your own page. The signal to trust is frequency: a subtopic present on four of five ranking pages and absent from yours is almost certainly part of the search intent. A topic only one competitor covers is an idea, not a gap.

Step 4: prioritize by impact, not by list length

Rank the gaps by two questions: how many ranking pages cover it, and how central is it to the intent? Three genuine sections added to an existing URL routinely beat three new thin posts, because they compound the authority the page already has.

Step 5: close the gaps as real sections, then re-measure

Write each missing topic as a self-contained section that answers it directly — not a keyword sprinkled into an existing paragraph. Then re-check after a few weeks: rankings move on completeness, and completeness is measurable.

Keyword gap, topic gap, semantic gap

Classic keyword-gap reports compare which queries two domains rank for — useful, but they tell you nothing about why. A topic-level diff like the one above explains the why. One level deeper still is the semantic content gap: the entities and relationships ranking pages mention that yours does not. That is the level at which both classic rankings and AI answers are decided.

The same diff now decides AI citations

AI Overviews and answer engines split a question into sub-queries and pick sources that cover them. A page with open gaps loses AI citations for exactly the reason it loses rankings — so one analysis now serves both channels. SerpTune automates the whole loop: it fetches the live SERP for your query and market, extracts what each competitor covers, and returns the prioritized topic list — plus a citability score from our free AI Overview checker.