The keyword gap between two sites is the list of search terms one site ranks for and the other does not. Finding it is the fastest way to generate content ideas that already have proven demand, because a competitor's rankings are a live map of what real people search and click.
Comparing two domains turns guesswork into a to-do list. Instead of brainstorming topics in a vacuum, you watch what is already pulling traffic for a rival and ask a simple question: why am I not on that page? This guide walks through how to pull both sites' rankings, sort them into useful buckets, pick the gaps worth your time, and get them on a publishing schedule.
Why does the keyword gap between two sites surface instant content ideas?
Most pages on the web go nowhere. An Ahrefs study of roughly 14 billion pages found that 96.55% of all pages get zero traffic from Google. Writing on instinct alone usually lands you in that silent majority.
A keyword gap flips the odds. When a competitor ranks for a term, a search engine has already confirmed the query exists and that the topic can earn clicks. You are no longer guessing whether people search for something. You are looking at evidence they do, and at a page that is currently answering them instead of you.
That evidence is valuable because the stakes at the top of the results page are high. Backlinko's analysis puts the average click-through rate for position one well above every lower slot, so the difference between page one and page two is the difference between traffic and invisibility. A gap report hands you a ranked set of chances to claim those spots.
How do you pull both sites' rankings?
The comparison starts with two organic keyword lists: one for your domain, one for the site you are measuring against. Here is the order that keeps the process clean.
- Confirm your own keywords first. Open Google Search Console and export the queries your site already ranks for, along with their position and impressions. This is free, and it is the most accurate picture of your own footprint because it comes straight from Google.
- Pull the competitor's organic keywords. Search Console only covers your property, so for the other site you need a third-party tool. Ahrefs, Semrush, and SE Ranking each report the organic keywords a domain ranks for, usually with position, volume, and an estimated difficulty score.
- Normalize the two exports. Make sure both lists use the same columns: keyword, position, search volume, and a difficulty figure if you have one. A quick spreadsheet cleanup now saves confusion later.
- Isolate terms only one site owns. Filter for keywords present in the competitor's list but absent from yours. That filtered set is the raw keyword gap, before you judge any of it.
If budget is tight, a free tool plus a careful spreadsheet gets you most of the way. The manual route takes longer to set up, but the exports are the same data a paid tool reads for you.
How do you read overlap, shared, and missing buckets?
Once both lists sit side by side, every keyword falls into one of three buckets. Reading them correctly is what separates a useful report from a pile of rows.
- Shared keywords. Both sites rank for these. They tell you where you are already competing head to head, and they flag terms where a small push in position could win real traffic.
- Overlap keywords. You both appear, but at very different positions. If a rival sits at number three and you sit at number thirty for the same term, the demand is proven and the page already exists. These are often quick wins through an update rather than a new post.
- Missing keywords. The competitor ranks and you do not appear at all. This bucket is the heart of a keyword gap analysis, because each row is a topic someone else is capturing while you are absent.
The missing bucket usually holds your best new ideas, but do not ignore the overlap bucket. Lifting an existing page from the bottom of page three to the top of page one is frequently faster than ranking a brand new article from scratch. For a structured approach to the whole comparison, see our walkthrough on how to run a competitor keyword gap analysis.
Which gaps are actually worth writing?
A raw gap list is long and mostly noise. Three filters trim it down to the keywords that deserve a brief.
- Relevance to what you sell. A term can have huge volume and still be useless if it attracts readers who will never become customers. Keep the keywords a buyer or qualified reader would type, and cut the tangents.
- Realistic difficulty. Ranking takes patience. Ahrefs research suggests only a small fraction of new pages reach the top ten within a year, so prioritize gaps where the ranking pages look beatable rather than chasing terms dominated by major brands.
- Clear and single intent. If you cannot tell whether a searcher wants to learn, compare, or buy, the keyword will be hard to satisfy. Favor terms with one obvious answer you can give better than the current page.
There is a newer reason to care about which gaps you close: AI answer engines. First Page Sage reports that the top citation in a Google AI answer earns a 5.2% click-through rate versus 3.6% for the number one organic result on the same page. Gaps where you can publish a clear, quotable answer give you a shot at that citation, not just a blue link. Structuring those answers well, with tight summaries and plain phrasing, is its own skill worth building.
How do you schedule the gaps you choose?
A gap report that lives in a spreadsheet changes nothing. The payoff comes when each chosen keyword becomes a dated draft on a calendar.
Rank your shortlist by a rough blend of relevance and winnability, then assign real dates. Treat the list as a backlog you work through in order, not a batch to clear in one heroic weekend. Steady beats sporadic here, because search engines reward sites that keep shipping and readers return to blogs that reliably answer their next question.
The honest bottleneck for most teams was never the ability to write a decent post. It was turning up every single week after the novelty wore off. A gap list makes that easier, since you always know the next topic, but you still have to publish. Cadence is what compounds: a dozen steady posts beat one brilliant piece that arrives and then nothing follows.
This is also where automation earns its keep. Bunzy analyzes your site, learns your brand voice and your winnable keywords, then writes and publishes to your own domain on a schedule you set. If the hard part for you is consistency rather than ideas, a gap analysis feeds the backlog and an autopilot engine keeps the queue moving without you babysitting every draft.
Start small. Run one comparison against a single competitor this week, isolate the missing bucket, pick the five most relevant terms, and put them on a calendar with real dates. That short list is worth more than a sprawling report you never act on.