What are the best AI visibility tools for content gap analysis? How we find and close gaps
How our agency runs content gap analysis for AI visibility: finding prompts where rivals are answered and clients are not, then closing the gaps with reviewed content.
A content gap in AI search is a question a client's buyers ask, where the engines answer and the client is missing. We find them with a method first and a tool second. Here is the method, and the tool we use to run it.
What a gap looks like in AI search
In classic SEO a gap is a keyword where a competitor ranks and you do not. In AI search it is a prompt where the answer names or cites someone else. The difference matters because AI engines often split a question into narrower sub-queries, called fan-outs. A competitor may win a prompt because one of their pages answers one sub-question well, even if they do not rank for the original phrase.
So we look for gaps at three levels: the whole prompt, the sub-question and the topic.
Our process
Build the prompt set. From sales calls, support tickets, existing rankings and comparison questions. We group them by topic and persona.
Run and record. Daily for at least two weeks. We want a rate, not a single answer.
List the prompts where the client is absent. Then for each, list who is named and which pages are cited.
Read the cited pages. What do they answer that the client does not? Format matters too: a how-to, a comparison, a definition, a table.
Score coverage. For topics where the client has content, how well does it cover the question? Some gaps are refreshes, not new pages.
Prioritize. By prompt demand, by buying intent, and by how beatable the competition looks.
What we use
We run client programs on Promptwatch, and for gaps we use several connected features.
Content gap analysis shows prompts where competitors are answered and the client is not, with coverage scores. It is available from the Essential plan and is part of every agency plan.
Prompt Volumes adds search volumes, difficulty scores and citation rates across AI search, Google and Bing, so we do not recommend writing for a prompt nobody uses. Query fan-outs per model show the sub-questions. Prompt Explorer suggests prompts from Search Console, ranking keywords, People Also Ask or any page, which is how we find prompts the client did not think of.
Personas and persona stacking let us check whether a gap applies to one buyer type or all.
Citation analytics and Page Tracker show the pages the engines cite and let us follow a rival's page over time. Topic Insights show where the client's pages underdeliver for their topic.
The Action Board turns this into a prioritized weekly list. A Discovery agent investigates the data on a schedule and suggests up to five evidence-backed actions per run.
Content Refresh gives diff-style update suggestions for existing pages. For new content, creation from a brief is available, and publishing goes to WordPress, Webflow and Framer. On Business, the Content Agent can plan, write and publish against visibility gaps on a schedule, using a review inbox or a hands-off mode with a quality check. Agency plans do not include the Content Agent, AEO articles or the knowledge base, so for agency-plan clients we write content ourselves or run it on a brand plan.
Brand plans: Explore is free, Essential $95, Professional $245, Business $579 a month. Agency plans: Kick-off $199, Growth $399, Scale $799.
How we close gaps without producing junk
We follow a few rules.
Review everything. Even with an agent, a person reads before anything publishes, and checks every claim about prices, features and results against a source.
Prefer refreshes where coverage is partial. Updating a page that is already crawled and cited is often faster than starting from zero.
Match format to what the engines cite. If the cited pages are comparison tables, a long essay will not do.
Fill the knowledge base. Promptwatch's knowledge base, available from Professional, holds brand facts so drafts stay on message. We curate it by hand.
Check crawl access before writing. A new page that bots cannot reach does nothing. Crawler logs, from Professional on brand plans, show whether they can.
Log changes with dates. So we can compare before and after.
What gap analysis cannot do
It cannot tell us that filling a gap will produce a citation. It gives us the likeliest places to work, and we measure afterward. It also cannot judge quality: a page can cover a gap and still be thin. Editorial judgment stays human.
For a client that wants to see what a gap list looks like on their own prompts, we suggest the free Explore plan on Promptwatch as a first look, though content gap analysis itself starts on Essential.