What a “Keyword Gap” Actually Means
A keyword gap is the difference between two lists: the queries your competitors rank for, and the queries you rank for. The overlap is where you fight head-on. The difference — keywords they rank for that you don’t — is where new traffic hides. Find those terms, build better pages for them, and you capture demand that already exists instead of guessing at new topics.
This is not about copying a competitor’s strategy sentence by sentence. A gap analysis answers a simpler question: what are searchers in your niche asking that your site never answers? Backlinko’s competitor keyword guide frames it the same way — competitor keywords reveal the patterns in a rival’s strategy and, more importantly, the segments they’re ignoring.
Paid tools automate the comparison in one click. But you can get most of the insight with free tools and thirty focused minutes. Here’s the workflow.
The Free-Only Workflow
Do these steps in order. Each one feeds the next, and none of them costs anything.
1. Start with your own Search Console data
Before looking outward, look at the data you already own. Open Google Search Console, go to the Performance report, and switch to the Queries tab. Sort by impressions. Now scan for queries with lots of impressions but very few clicks — those are pages Google already shows for real searches, but searchers pass over your result.
Most of the time the fix is a clearer title or a more useful meta description, not a new article. Click a promising query, flip to the Pages tab, and see which page it lands on. A query with rising impressions and flat clicks usually points to a ranking or snippet problem, not a demand problem. Cross-check the page’s index status with the same method covered in our guide to checking if your website is indexed — a page that isn’t indexed can’t win anything.
One honest caveat: Search Console only shows data for sites you’ve verified you own. There’s no switch that reveals a competitor’s queries. Everything competitor-facing from here on uses third-party or manual methods.
2. Map your real SEO competitors by hand
Your SEO competitors aren’t always your business competitors. A plumber’s SEO rivals might include Yelp, HomeAdvisor, and a local blogger — not the plumber across town. To find them, Google your five most important seed keywords in a private window and write down which domains appear again and again in the top ten.
While you’re there, open the “People also ask” boxes. They surface the exact questions searchers ask next — raw material for both keyword ideas and FAQ sections. The domains that rank for your seeds, plus the brands answering the PAA questions, are your gap-analysis targets. Pick two or three, not twenty.
3. Pull 100 free keyword ideas from Ahrefs’ Keyword Generator
Ahrefs offers a free Keyword Generator that returns the top 100 keyword ideas for any seed phrase you enter, along with estimated search volume and a Keyword Difficulty score — no account required. Type in a seed your competitors rank for and you’ll get the most important related terms fast.
Two features make this one especially useful. First, the Questions toggle filters the list to informational queries — the how/what/why terms that are usually cheaper to rank for and perfect for a growing blog. Second, every idea comes with volume and KD baked in, so you can judge opportunity without hopping between tools.
4. Cross-check volume with Google Keyword Planner
Third-party volume numbers are estimates. Keyword Planner is Google’s own keyword tool, so its ranges come from the source. Google’s own docs note you must complete an Ads account setup — including entering billing information — before the keyword-ideas features unlock, but you don’t have to spend anything to use it.
Expect ranges (like 1K–10K) rather than exact counts for most accounts — that’s a known limitation, not a bug. Use Planner to confirm a keyword has real, sustained demand before you commit a week of writing to it, then use the free tools above for the idea generation itself.
5. Get in-SERP metrics with a free keyword extension
Browser extensions put keyword data directly inside your Google search results, which makes the manual competitor mapping from step 2 far richer. Keywords Everywhere is the classic example, and its pricing page is refreshingly honest: the keyword-list widgets (Related, People Also Search For, Long-tail) keep working even with zero credits — only volume, CPC, competition, and trend data require credits.
That means the free layer alone gives you Google’s own related-query suggestions quantified and exportable, which is exactly the raw material a gap analysis needs. Turn the extension on, run your seed searches, and harvest the related-keyword widgets into a spreadsheet.
6. Run a manual content gap with the site: operator
Here’s the free replacement for the paid “content gap” tools. Type site:competitor.com followed by a topic keyword into Google, and you’ll see which of their pages mention or target that topic. Do this across your core topics and you get a rough map of their content clusters — pillar pages and supporting articles.
Now compare that map against your own sitemap. Every cluster they cover deeply that you barely touch is a gap. Also read the customer reviews of a competitor’s product on sites like G2 or Trustpilot: customers phrase pain points in natural, non-marketing language that keyword tools often miss, and those phrases make excellent long-tail targets.
7. Filter with the low-difficulty discipline
A list of gaps is useless without a filter. Keyword Difficulty scores run 0–100, and Ahrefs’ version is based on the number of referring domains pointing at the current top-ranking pages. A common practitioner’s rule of thumb is to favor keywords under roughly 30 when your site is new or small — and treat it as a rule of thumb, not a law. KD scales aren’t linear, and one tool’s 27 is not another tool’s 27.
Practically: sort your gap list by KD ascending, delete anything you can’t realistically beat (huge media brands with thousands of backlinks), and keep the terms where the top ten includes forums, small blogs, or thin content. That’s where a focused, well-written page can genuinely win. If you want the full free research process that leads into this step, our free keyword research guide walks through it in detail.
Match the Intent Before You Write
A gap is only an opportunity if you can serve the intent behind it. Before writing, Google each target keyword and look at what’s ranking: how-to guides signal informational intent, product roundups signal commercial intent, and pricing pages signal transactional intent. If the top ten for your keyword is all e-commerce category pages and you publish a how-to guide, you’re answering a question nobody asked on that page. Match the format the SERP rewards — then write the better version of it.
What Free Methods Can’t See
Honesty matters here. The one-click domain-vs-domain gap tools — type in two URLs, get the difference — sit behind paid plans, and there’s no free equivalent with the same depth. Free tools also cap how much you can pull: Ahrefs’ generator tops out at 100 ideas per query, extension data needs credits for metrics, and every third-party volume number is an estimate, not Google’s internal truth.
None of that is fatal. Manual SERP mapping finds your real competitors better than an automated list ever will, and the site: operator plus review mining surfaces gaps the paid tools’ indexes sometimes miss. The free workflow is slower and capped — but the keywords it finds are just as real.
The 30-Minute Gap Routine
Put it together once a month. Ten minutes in Search Console for your own impression-rich queries, ten minutes mapping competitors and harvesting related keywords with a free extension, ten minutes filtering the list by difficulty and intent. Whatever survives becomes your content calendar. The competitors you’re watching are doing this with expensive tools. You’ll be doing it with better judgment — and spending nothing.
What is competitor keyword gap analysis?
Competitor keyword gap analysis compares the keywords your competitors rank for against the keywords you rank for. The “gap” is the set of terms they rank for that you don’t — those are new content opportunities with proven search demand.
Can I see a competitor’s keywords in Google Search Console?
No. Search Console only shows data for websites you’ve verified you own. Competitor keyword data comes from third-party tools like Ahrefs or Semrush, or from manual methods like mapping the SERPs and using the site: search operator.
What is a good Keyword Difficulty score to target?
There’s no universal answer, since every tool calculates difficulty differently. A common rule of thumb for newer or smaller sites is to favor keywords with a KD under roughly 30 — but treat it as a filter, not a guarantee, and always check what actually ranks in the top ten.
Are free keyword tools accurate?
They’re useful but limited. Ahrefs’ free Keyword Generator gives you 100 ideas with volume and difficulty estimates, and Google’s Keyword Planner shows volume ranges from Google’s own data — but all third-party numbers are estimates, and free tiers cap how much you can pull. Use them for direction, not precision.
How often should I run a keyword gap analysis?
Once a month is a practical rhythm for most sites. Competitor content and SERPs shift constantly, but monthly checks are frequent enough to catch new opportunities without turning research into procrastination.
