Content Gap Analysis: How to Find and Close the Gaps

Content gap analysis is the process of finding keywords or topics your competitors rank for that you don’t, then deciding which ones are worth chasing. Done right, it builds a 3-6 month editorial roadmap based on real search demand. Done wrong, it becomes a spreadsheet you never open again.

I’ve run this exact workflow for 200+ Gatilab client audits since 2018. The method below is what survived after trying every variation. It’s not fancy. It works.

What content gap analysis actually is

A content gap is any keyword with meaningful search volume where a direct competitor ranks on page 1 and you don’t rank at all or rank below position 30. Analysis is the process of identifying those keywords, filtering for the ones that match your intent and capability, and prioritizing the ones most likely to move traffic or revenue.

The deliverable at the end isn’t a spreadsheet. It’s a prioritized list of content briefs with target keywords, intent notes, and an ownership assignment. If your gap analysis ends with 800 rows in a Google Sheet and no briefs, you did the first half and skipped the half that matters.

Why most content gap analyses fail

Most audits I inherit from other agencies fail for the same three reasons. They pick the wrong competitors. They export 5,000 keywords and never filter. And they treat volume as the only scoring metric when intent and difficulty matter more.

The one that kills the most projects: wrong competitor selection. If you pick competitors by brand similarity (“we’re both SaaS tools for HR”) instead of SERP similarity (“who actually ranks for the queries our customers search”), you import their editorial priorities, not yours. I’ll cover how to pick in step 1.

Step 1: Pick the right competitors

Pick 3-5 SERP competitors, not brand competitors. A SERP competitor is any domain that consistently appears on page 1 for the keywords your ideal customer searches. They might not be in your industry. That’s fine. They’re competing for the same attention.

How I pick competitors for a Gatilab client audit:

1. Start with 10-15 seed keywords that describe what we sell or solve
2. Run each seed keyword through Ahrefs, Semrush, or Google directly
3. Note which domains appear in the top 10 for at least 4 of the seeds
4. From that list, pick 3-5 with similar traffic scale (don’t compare a new site to Wikipedia)

For a mid-size SaaS client in the project management space, this usually surfaces 2 direct competitors (Asana, Monday) plus 2-3 editorial-only competitors (Zapier blog, HubSpot blog, an industry media site). The editorial-only competitors are usually where the biggest gaps live, because they publish hundreds of posts per year on adjacent topics you’ve ignored.

Bad competitor picks: the biggest brand in your space (too broad, you’ll never catch Wikipedia-scale domains), a startup with similar revenue but different SEO strategy (you’ll miss volume), or anyone ranking only from brand equity (their rankings don’t transfer).

Step 2: Pull the keyword data

Once you have 3-5 competitors, pull their ranking keywords into one spreadsheet. Every major SEO tool has a Content Gap or Keyword Gap feature that does this for you.

My default: Ahrefs Content Gap for the initial pull (biggest index, catches the most keywords), then cross-reference with Semrush Keyword Gap for intent tagging. On a tight budget, Moz Pro or SE Ranking get you 80% of the result.

In the tool:

• Add your domain and the 3-5 competitors
• Filter: “Keywords where competitors rank top 10 AND you don’t rank top 30”
• Export to CSV

Expect 1,000-8,000 rows depending on industry. That’s the raw pool. Now we filter.

Step 3: Filter for intent

Keyword volume without intent context is noise. A 50,000-volume keyword you can’t monetize or serve is worth less than a 500-volume keyword that matches your buyer’s decision moment. Filter before you score.

Four intent categories I tag every keyword into:

• Informational: user wants to learn (how, what, why, guide, tutorial)
• Commercial: user is researching before a purchase (best, top, review, vs, alternatives)
• Transactional: user is ready to buy (buy, pricing, deal, coupon, signup)
• Navigational: user wants a specific site (brand names, product names)

Match intent to your capability. If you sell project management software, commercial (“best project management tool”) and transactional (“asana pricing”) keywords feed revenue. Informational keywords (“what is a gantt chart”) feed top-of-funnel traffic that might convert six months later. Navigational keywords with competitor names can work for comparison content, but they rarely convert if the searcher knows exactly who they want.

Practical filter: drop anything in your spreadsheet where intent doesn’t match a content type you can realistically produce. If you’re not going to publish reviews, drop the “best X” keywords. Don’t pretend you’ll come back to them.

Step 4: Score by opportunity

Not every gap is worth closing. Score the remaining keywords by opportunity, not just volume. I use a composite score that weighs four factors:

1. Search volume (monthly): the ceiling for traffic
2. Keyword difficulty (KD 0-100): how hard to rank
3. Business relevance (1-5): how closely does the query map to what you sell or care about
4. Current ranking position (your site): how much work to get on page 1

Simple formula I use:

“ Opportunity score = (Volume / KD) Business_Relevance Position_Multiplier “

Position multiplier: 1.0 if you don’t rank, 1.5 if you rank 31-50, 2.0 if you rank 11-30, 3.0 if you rank 6-10 (quick wins).

Sort the sheet by opportunity score. The top 30-50 rows become your editorial roadmap. Anything below that threshold is “maybe later” and you should stop looking at it.

Alternative scoring approach for e-commerce or transactional businesses: replace business relevance with estimated revenue per click (RPC). If you know a keyword converts 2% and each customer is worth $400, its RPC is $8 regardless of search volume. That changes the ranking order dramatically.

Step 5: Turn keywords into content briefs

This is the step most audits skip and the reason most audits don’t produce traffic. Every keyword that makes the final cut needs a content brief before it enters the content pipeline.

A brief I ship to writers includes: primary keyword, 2-5 secondary keywords, search intent, target word count (based on what’s ranking now, not an arbitrary rule), required headings (pulled from the SERP), SERP features present (featured snippet, People Also Ask, video pack), internal links to include, and a judgment note from me on what’s missing from competitors’ current content.

That last note is the whole point of the brief. If every writer does what competitors already do, you match the SERP but don’t beat it. The brief should name specifically what your version will add: original data, a specific angle, a reader demographic competitors ignored, a tooling comparison nobody has published.

Example of a real brief note from a 2025 client audit (travel gear): “Competitors all cover 10 bags. None cover bags for flights with strict 7kg carry-on limits (AirAsia, Ryanair, Wizz Air). Our brief: 10 carry-on bags under 7kg with actual weight-test data. This closes the gap AND creates one only we can serve.”

Tools I actually use and what they do best

The four tools in my working setup across 2024-2025 client projects:

Ahrefs ($129-$1,499/mo): Content Gap, Keywords Explorer, Site Audit. The keyword index is the biggest in the industry. I pull the initial competitor gap list here. Site Explorer shows top pages per competitor, which surfaces gaps the gap tool misses.

Semrush ($139-$499/mo): Keyword Gap, Topic Research, Keyword Magic Tool. Semrush’s intent tagging is faster than manually categorizing Ahrefs data. Topic Research pulls cluster ideas from a seed keyword that often surface gaps Ahrefs’ pure-keyword view doesn’t.

Moz Keyword Explorer ($49-$179/mo): Priority score (proprietary 0-100), keyword suggestions. The Priority score combines volume, difficulty, and CTR in a way that roughly matches what I score manually. Useful sanity check.

Google Search Console (free): the ground truth for your own data. I use GSC’s “Queries” report filtered to impressions without clicks as a secondary gap source. These are keywords you’re already ranking for (positions 11-30) but not well enough to earn clicks. Close those gaps with a refresh, not a new article.

Honorable mentions: Screaming Frog for technical alignment (make sure your existing pages don’t block themselves with bad canonicals or noindex), and Also Asked for People Also Ask mining on specific keywords you’re scoping.

Common content gap mistakes

Exporting without filtering. An 8,000-row CSV becomes an ignored CSV. Filter to under 100 rows before you open Excel.

Chasing the biggest competitor. If Wikipedia, Forbes, and the New York Times rank for your keyword, you’re not closing that gap in six months. Focus on gaps where you can realistically hit page 1.

Ignoring cannibalization. If you already have a weak article targeting the keyword, publishing a second one splits signals. Refresh the existing article first. Only create new content when no existing page is within reach.

Treating the analysis as a one-time project. Competitor rankings shift every month. Repeat the analysis quarterly. On Gatilab retainers, we re-run gap analysis every 90 days and typically find 15-30 new gaps that didn’t exist the previous quarter.

Writing to the spreadsheet instead of to the reader. The spreadsheet tells you which keywords to target. It doesn’t tell you what to write. If your article checks every SERP-feature box and still reads like every other result, you’ll match page 1, not lead it.

How to prioritize when the list is still too long

Even after scoring, you’ll have more keywords than you can cover this quarter. Break the top 50 into three priority buckets:

P0 (ship this month): quick wins where you’re already ranking 6-20 and a refresh could move you to page 1. Lowest effort, fastest ROI.

P1 (ship next 30-60 days): medium-difficulty gaps that map to your primary revenue intent. New content, with solid briefs.

P2 (ship when P0 and P1 are done): high-volume but high-difficulty gaps. These need link-building support and may take 6-12 months to rank. Plan them into longer editorial cycles.

Don’t try to do everything. Shipping 10 P0 refreshes and 5 P1 new articles in a quarter beats publishing 40 pieces that each compete for the same thin slice of attention.

Content gap analysis for small sites

If you’re working with a site under 1,000 monthly organic visits, the math is different. You don’t have historical data to reference. GSC queries are thin. Your domain authority limits which gaps are realistic.

Adjusted method for small sites:

• Skip the top competitors in your space. Pick competitors 2-3 tiers down in authority.
• Filter for KD under 30 ruthlessly. High-KD gaps are a year-plus away.
• Lean heavier on commercial-intent, lower-volume long-tail (50-500/mo). These convert, rank faster, and compound.
• Re-run gap analysis every 6 weeks, not every 90 days. Your domain trajectory changes faster.

Small sites shouldn’t chase the same gaps as a 200K-visit competitor. The gaps that matter for you are smaller, more specific, and closer to buyer intent.

The verdict

Content gap analysis is the highest-ROI strategic work you can do in SEO, and the work most teams skip because it’s less fun than writing. The difference between an editorial calendar built on gap analysis and one built on brainstorming is roughly an order of magnitude in traffic growth over 12 months. I’ve watched it play out enough times to stop treating it as optional.

Pick competitors by SERP overlap, not brand overlap. Filter by intent before you score. Score by opportunity, not volume. Turn every row into a brief with a specific information-gain angle. Revisit quarterly. That’s the whole method, and it’s enough.