The gaps that matter are keywords three or more competitors rank for and you don't
The most valuable output of competitor keyword analysis is not the list of terms a single rival ranks for. It is the set of keywords that three or more competitors rank for while you rank for none of them. When one site ranks for a query, that proves only that one site tried. When three independent competitors all rank for the same term, you have consensus, and consensus confirms two things a lone ranking never can: real search demand, and commercial viability. Someone has already validated that keyword as worth chasing, three times over. Your job is to surface those overlaps, filter them by intent and difficulty, and build the pages that close the gap.
That reframes the exercise. Competitor keyword analysis is not spying on one company. It is reading the collective judgement of everyone winning the search results you want, then acting on the terms they agree on and you are missing.
Your SEO competitors are usually not your business competitors
Here is the mistake that wrecks most analyses: people run the gap report against the companies their sales team names as rivals. That is the wrong input.
Say you sell invoicing software. You type "best invoicing software for freelancers" into Google and read page one. The sites beating you are rarely rival SaaS products. They are affiliate review blogs, marketplaces like G2 and Capterra, listicles from finance media, and a Reddit thread. Those are your SEO competitors for that query, because those are the pages holding the positions you want. Running a gap analysis against another invoicing startup that also can't rank tells you nothing.
So before you pull any data, define competitors by the SERP, not the org chart:
- Take 8 to 12 of your priority keywords.
- Look at who actually holds positions 1 to 10 for each.
- Count which domains recur across those results.
- The domains that appear most often are your real SEO competitors, whether or not they sell what you sell.
This is also why a tool that reads local and vernacular results matters. If you compete in India, the domains ranking for "invoicing software" in a Mumbai SERP, or for a Hindi-language variant, are often a completely different set from the US page one. Pull the gap against whoever occupies the SERP you are actually trying to win, wherever that is.
Keyword gap vs content gap: they are not the same thing
These two terms get used interchangeably and shouldn't be.
Keyword gap analysis works at the query level. It compares the exact keywords you rank for against the exact keywords competitors rank for, and surfaces the terms where they have positions and you have none or much weaker ones. The output is a list of individual keywords. Semrush's own breakdown of keyword gap analysis and SE Ranking's keyword gap guide both treat it this way.
Content gap analysis works at the topic and journey level. It asks which subjects, questions, and buyer stages your competitors cover that you don't. The output is a list of pages or topics to create, not just keywords to target. A content gap looks like "they all have a comparison page and a migration guide; you have neither."
You need both. The keyword gap tells you which specific phrases to win; the content gap tells you what to build to win them. In practice you run the keyword gap first, then cluster the results into topics to expose the content gaps underneath.
How to find competitor keywords, step by step
The mechanics are the same across any capable tool. The discipline is in the filtering.
- Fix your competitor set from the SERP (see above). Pick 3 to 5 domains that genuinely recur in the results you want.
- Run the overlap report. Enter your domain plus the competitors, and it returns four buckets: Missing (they rank, you don't at all), Weak (you rank but worse), Shared (everyone ranks), and Untapped (only some rank). The gold sits in Missing and Weak.
- Sort by how many competitors rank. A keyword where four of your five competitors rank is a far stronger signal than one where a single competitor does. Consensus is your demand filter.
- Layer intent onto it. A high-volume informational term you are missing is worth less than a lower-volume buyer intent keyword where the searcher is close to purchasing. Match each gap keyword to its search intent before you value it.
- Screen for difficulty. A gap you can realistically close in three months beats one that needs 200 referring domains you don't have. Read keyword difficulty as a function of your own authority, not an absolute number.
If you want the full upstream method that feeds this, start with the pillar on keyword research and the practical walkthrough of how to do keyword research. Competitor analysis is one input into that larger process, not a replacement for it.
A prioritisation filter that actually ranks the list
A raw gap report can return thousands of keywords, and most are noise. Score each one and the list sorts itself. A workable formula:
Priority = (competitor count × intent value) ÷ difficulty
- Competitor count is how many of your tracked competitors rank in the top 10 for that term. More is stronger.
- Intent value is a weight you assign by stage: transactional and commercial-investigation terms score high, top-of-funnel informational terms score low.
- Difficulty is the keyword difficulty score adjusted for your site's authority. Divide by it so easier wins float up.
Worked example. Two gap keywords:
| Keyword | Competitors ranking | Intent value | Difficulty | Priority |
|---|---|---|---|---|
| "invoicing software with GST" | 4 | 8 (commercial) | 20 | 1.6 |
| "what is an invoice" | 5 | 2 (informational) | 15 | 0.67 |
The first wins despite fewer competitors, because commercial intent and low difficulty carry it. The second is high-demand but low-value and easy to leave for later. Run every gap keyword through this and you get a ranked backlog instead of a spreadsheet you will never action.
Once ranked, the long tail matters. Broad head terms in a gap report are usually the hardest to close; the long tail keywords buried underneath them are where you will actually rank first, and where low competition keywords hide. Cluster the survivors so one page can capture several related gaps rather than spreading thin.
Turn the gap list into pages, not a spreadsheet
A gap report that sits in a tab is worthless. The output has to become a content plan.
- Cluster the prioritised gaps into topics so a single page targets a group of related keywords. Grouping by intent and semantic relationship keeps you from cannibalising yourself.
- Map each cluster to a page: is this a new article, an addition to an existing one, or a comparison page you are missing entirely? Solid keyword mapping prevents two of your own pages fighting for the same term.
- Check the SERP again before you write. Google's Search Essentials note that meeting the guidelines alone won't guarantee ranking, and its guidance on helpful, people-first content makes clear the page has to satisfy the query. Look at the format already winning: if every ranking page for a gap keyword is a listicle, a 3,000-word essay probably won't rank.
- Watch the calendar where relevant. Some gaps are seasonal keywords that competitors rank for only part of the year; time your publishing accordingly.
The value of competitor keyword analysis is in the doing, not the finding. A ranked, clustered, mapped backlog is the deliverable.
Doing it without three enterprise subscriptions
A proper version of competitor keyword analysis needs three things in one view: the gap report itself, the backlink data that explains why a competitor outranks you, and rank tracking to confirm you are actually closing the gap after you publish. Buying those as separate enterprise tools gets expensive fast.
DeployFlare runs the gap and overlap analysis alongside backlink data and rank tracking in one place, at a fraction of enterprise pricing, from ₹499/month billed in INR with UPI and GST. The keyword research module reads local and vernacular SERPs, so when your real SEO competitors differ by city or language, the gap report reflects it. If you are pricing this out against the incumbents, the Ahrefs alternative comparison covers what you keep and what you save. However you tool it, the method holds: find where the consensus is, filter by intent and difficulty, and build the pages.