Content Gap Analysis for SaaS: A 90-Minute Topical Authority Audit

A content gap analysis answers one question: which buyer questions does your SaaS site fail to answer that your competitors do? Run it in 90 minutes, ship the gaps over a quarter, and you build the kind of topical authority AI engines reward with citations.

This is the working version of the audit we run on our own domain.

What content gap analysis actually is

Content gap analysis is a structured comparison of your site's coverage against the questions a buyer asks during the purchase journey. Three inputs, one output:

• A list of buyer-intent questions (input)
• Pages on your site that answer them (input)
• Pages on competitors' sites that answer them (input)
• A ranked list of gaps to close (output)

It's the foundation of any serious topical authority play, and the highest-leverage content audit you can run in a single afternoon.

Why topical authority matters more in AI search

Traditional SEO weighed individual page quality. AI search weighs coverage. ChatGPT and Google AI Overviews are likelier to cite a domain that demonstrably owns a topic — that has a page for every adjacent question, not just the high-volume head terms.

That's the topical authority advantage. The AI engine sees that you have:

• A page on the head term
• A page on each subtopic
• A page on each common objection
• A page on each comparison your buyer makes

— and concludes you're a primary source. The brand-citation rate goes up because the model has more places to cite from and fewer places to cite past you.

The 90-minute audit

Step 1 — list 30 buyer questions (20 minutes)

Open a doc. Write down 30 questions your buyer would type into ChatGPT during the purchase journey. The questions live on a spectrum:

• Awareness — "what is [category]?", "do I need [tool]?"
• Consideration — "best [category] for [audience]", "how does [category] compare to [adjacent category]?"
• Comparison — "[competitor A] vs [competitor B]", "[competitor] alternatives", "[competitor] pricing"
• Decision — "is [tool] worth it?", "[tool] free trial", "[tool] for [specific use case]"
• Implementation — "how to set up [tool]", "[tool] integrations with [other tool]"

Write the questions in the literal phrasing your buyer would use. "What replaces Mixpanel for a bootstrapped team?" beats "best Mixpanel alternative for SMB."

Step 2 — score your coverage (30 minutes)

For each of the 30 questions, ask: do I have a page that answers this directly? Score each:

• 2 — yes, dedicated page. A URL whose H1 is essentially the question.
• 1 — buried inside another page. The answer exists but isn't the page's primary purpose.
• 0 — no answer on site.

Sum the scores. Out of 60. Most SaaS sites we audit score 18–28.

Step 3 — score competitors (30 minutes)

Pick three competitors. Run the same scoring on each. Don't try to be exhaustive — five minutes per question per competitor.

Now you have a coverage matrix: 30 questions × 4 sites. The gaps are the rows where competitors score ≥ 1 and you score 0.

Step 4 — prioritize (10 minutes)

Don't ship 30 pages. Pick the 10 highest-priority gaps:

1. Sort gaps by competitor score (the more competitors covering a question, the more important).
2. Within that, sort by purchase-stage (decision-stage gaps beat awareness-stage gaps for revenue).
3. Drop anything you genuinely shouldn't write (out of scope, false claim, low-fit query).

You now have a content backlog ranked by topical authority impact.

What to do with the backlog

A topical authority tool will tell you a lot of things at this point. Here's the only thing that matters: ship the gaps, one page per gap, applying the AI content optimization rules:

• One question per page.
• Lead with the literal answer in the first 60–100 words.
• Descriptive H2s — the user's phrasing, not your jargon.
• Cap each section at ~150 words.
• Add Article and FAQPage schema.
• Cite primary sources.

A reasonable cadence is two pages per week. Five weeks to close the top ten gaps. You'll see citation-rate movement in ChatGPT around week 6–8.

Pillar page strategy: when to build a hub

A content pillar strategy stitches the gap-closing pages into a topical hub. The hub is one comprehensive pillar page; the spokes are the question-pages you just shipped.

When does it pay off?

• You have ≥ 8 pages on adjacent questions.
• The questions cluster around one identifiable topic.
• You don't already have a page that could serve as the hub.

If yes to all three, build a pillar page that links every spoke. Pillar page SEO works because internal links concentrate authority — the model reads the hub as "this domain owns this topic."

If you have fewer than eight spokes, don't build the pillar yet. A pillar page with three spokes looks thin and signals the opposite of authority.

Expertise SEO: the third leg

Topical authority is necessary but not sufficient. The other half is expertise SEO — signals that the author and organization know the topic. ChatGPT and Google AI Overviews increasingly weight these:

• Named author with a real bio.
• Author's other work linked from the bio.
• Organization JSON-LD with founding date and team.
• Third-party mentions of the author or organization (G2, Capterra, podcasts, conference talks).

A content gap analysis closes coverage gaps. Expertise SEO closes credibility gaps. Most SaaS sites need both.

Tools, briefly

If you want to automate parts of this, these tools cover the major use cases:

• Topical authority and content briefs — Frase, MarketMuse, Surfer SEO.
• Competitor coverage analysis — Ahrefs Content Gap, SEMrush Keyword Gap.
• AI citation tracking — FactSentry (this is us; we audit how AI engines describe your SaaS).

You can also do the full audit by hand. We did our first three by hand and they didn't take longer than the tooled versions, just less colourful.

What to ship this week

If you're picking one thing from this post, run steps 1–4 today. The 90 minutes will pay back in clarity. By the end of it you'll have a ranked list of pages to write — which is more than 80% of SaaS founders ever produce.

After that, the only question is cadence. Two pages a week, applied for two months, and your topical authority moves from "below the median" to "demonstrably owns the topic." That's the threshold AI engines start citing from.

Want to see how the gaps you have today affect your AI citation rate? Run a free audit — we score your domain against ChatGPT and surface the queries where competitors get cited instead of you.