Keyword Gap Analysis Tools: What They Cost (2026)
A keyword gap analysis tool shows you the terms competitors rank for and you do not. The first price you see is often a yearly rate, or a plan without the gap feature. Here is what each one costs, read from the vendors' own pages on 26 September 2026.
In short
- Ahrefs includes Competitive Analysis in its $129 Lite plan, and Semrush includes Keyword Gap in its $139.95 SEO plan, paid month to month. Surfer keeps Coverage Gap in its $219 Pro plan, and Scalenut keeps topic gaps in its $89 Plus plan.
- Yearly rates look cheaper. Semrush's SEO plan is $117.33 a month billed yearly, and Surfer's plan cards show the yearly rate first. MarketMuse publishes no prices for its paid plans.
- Every figure here was read off the vendor's own pricing and help pages on 26 September 2026, and is dated so you can catch it going stale.
- A gap list is the easy half. Deciding which gaps are worth writing, and then writing them, is the half that costs time.
- We build one of these workflows ourselves, so we left it out of the comparison.
A keyword gap analysis tool compares your rankings against your competitors' and lists the terms they win and you do not. If you want the gap list without learning a platform, rankr runs the analysis for you as part of its keyword research service. Every major SEO platform sells one. Several of them do not sell it at the price you see first.
We read seven vendors' own pricing pages on 26 September 2026 and recorded which tier actually contains the gap feature. On Ahrefs, Competitive Analysis is in the $129 a month Lite plan. The cheaper $29 Starter plan does not list it. On Surfer, Content Ideas and Coverage Gap is in the Pro plan, at $219 a month paid month to month. The $49 on Surfer's page is its cheapest plan, Discovery, billed yearly. Semrush puts Keyword Gap in its entry SEO plan, at $139.95 a month paid month to month. MarketMuse publishes no prices and asks you to book a demo.
That is the finding this page exists for. Below is what each platform costs, where the gap feature actually lives, and what to do if none of it is worth the money for the size of site you run.
How much do keyword and content gap analysis tools cost?
On 26 September 2026, a tool that compares your whole site against a competitor's cost $129 a month at Ahrefs and $139.95 a month at Semrush, paid month to month. Tools that find gaps one topic at a time cost $49 to $219 a month, and MarketMuse has a free plan capped at 10 queries a month.
What the tools cost
Prices read 26 Sep 2026 from each vendor's own pricing page. All prices are in US dollars, per month.
| Platform | Cheapest plan with the gap feature | Month to month | Billed yearly, per month | What the vendor calls it |
|---|---|---|---|---|
| Ahrefs | Lite | $129 | $108 | Competitive Analysis (Content Gap) |
| Semrush | SEO | $139.95 | $117.33 | Keyword Gap |
| Surfer | Pro | $219 | $182 | Content Ideas & Coverage Gap (Topical Map) |
| Scalenut | Plus | $89 | $36 on a limited 60% offer | Topic gaps & Recommendations (Gaps & Gains) |
| Frase | Starter | $49 | $39 | Deep Research "Opportunities", one topic at a time |
| Clearscope | No gap feature | $129 for Essentials | Not shown | Topic Explorations is the closest thing |
| MarketMuse | Free | Free, 10 queries a month | Paid plans not published | SERP Heatmap topic gaps |
Three things worth pulling out of that table.
The price on the banner is often lower than the price of the feature. Surfer's cheapest plan shows $49, billed yearly. Coverage Gap sits in Pro, at $182 billed yearly or $219 month to month, so the feature costs more than three times the banner price. Ahrefs also sells a $29 Starter plan without Competitive Analysis, and Scalenut keeps its topic gaps in Plus at $89, one plan above its $59 Starter.
Yearly rates look cheaper. Semrush's SEO plan is $117.33 a month if you pay for a year, and $139.95 if you pay month to month. Surfer's plan cards show the yearly rate first. That is normal practice, and it is worth knowing before you compare one tool against another.
One vendor will not tell you. MarketMuse publishes no prices for its paid plans, and its free plan stops at 10 queries a month. That is not disqualifying, but a tool you cannot price without a sales call is a slower purchase than one you can.
What we checked, and what we did not
On 26 September 2026 we opened each vendor's public pricing page and recorded the plan names, the advertised monthly figures, and any statement about which tier contains the gap or competitive analysis feature. Where the pricing page did not say, we checked the vendor's own help pages.
What that gives you: current, dated, checkable pricing, and the tier boundary that most comparison posts skip.
What it does not give you: a bake-off. We have hands-on experience with Ahrefs. For the rest we are reporting published pricing and documented feature tiers, not measured output quality. Anyone claiming they ran all seven properly this quarter is probably describing a spreadsheet, not a test.
Prices go stale. This page is dated for exactly that reason. Check the vendor before you buy.
What keyword gap analysis actually means
Keyword gap analysis compares your site's ranking keywords against two or three competitors and surfaces the terms where they rank and you do not. Some vendors sell the same job as content gap analysis, and Ahrefs lists it as Competitive Analysis (Content Gap).
It answers a sharper question than "what should we write about?" It answers "what are buyers already searching for, that a competitor is already capturing, that we have left on the table?" You are not guessing at demand. You are reading a demand signal somebody else already validated with their own money.
That is genuinely the highest-intent input a content team has. It is also only the first step. A gap report will hand you 200 keywords in a spreadsheet. Most of them are not worth writing. The work that moves traffic is deciding which few are, understanding why someone searches them, and shipping something that deserves to rank. No tool on this list does that part for you.
The best keyword gap analysis tools, grouped by what they are for
Built to find the gap
Ahrefs. The deepest backlink and competing-domains data of the group, and the one we use ourselves. Competitive Analysis is in the $129 Lite plan, which gives you 1,000 credits a month and caps each report at 2,500 rows. If your question is "who else ranks for this, and how strong are they," this is the reference.
Semrush. The broadest all-in-one: keyword data, competitor tracking, position tracking, site audit. Keyword Gap is on the entry SEO plan. The pricing page does not name it, but Semrush's help page lists Keyword Gap limits for every plan. The SEO plan is $139.95 month to month, or $117.33 a month billed yearly.
Built to improve a draft you already have
Surfer. Scores a draft against what currently ranks and tells you what to add. The gap-flavoured feature, Content Ideas and Coverage Gap, appears at the Pro tier, $219 month to month or $182 a month billed yearly. Below that you are buying an optimiser, not a gap tool.
Clearscope. Editorial content grading, $129 Essentials and $399 Business. It is not a keyword gap tool and does not claim to be. It is on this page because it is frequently listed alongside them and the distinction matters when you are choosing.
Built to get from brief to draft
Frase. SERP-driven briefs and drafting, $49 Starter, $129 Professional, $299 Scale.
Scalenut. AI writing with cluster planning, $59 Starter, $89 Plus, $199 Professional. Note the site was running a 60% annual discount when we checked, which makes the advertised annual figures look much lower than the standing monthly rate.
MarketMuse. Topic modelling and content planning across Free, Optimize, Research and Strategy tiers. Pricing is demo-gated.
How to choose without overbuying
Start from how often you will actually run a gap analysis.
If the answer is once a quarter, you do not need to pay $129 or more every month. Buy a single month, export what you need, cancel, and repeat next quarter. Gap data does not change fast enough to justify paying for the other eleven months.
If the answer is weekly, and you are also tracking positions and auditing the site, an all-in-one is cheaper than three specialist tools. For a Singapore business, our comparison of SEO tools for Singapore small businesses prices the all-in-ones side by side.
If the bottleneck is not finding gaps but writing the articles, none of these solves it. A gap report is not the constraint. Time is.
And if you are a small site with low domain authority, be honest about what a gap list will do for you. Finding out that a much stronger competitor ranks for a term does not mean you can.
Where we fit
We build keyword and competitor gap research into a service we sell, so we have left ourselves out of the comparison above.
If you would rather not buy and learn a platform, we run keyword gap analysis as a service, as part of our keyword research service, and hand over the SERP review and the reasoning behind each call, not just an export. If you would rather own the tooling, Ahrefs Lite or Semrush covers the gap report, and expect to spend about a quarter learning it before the report pays for itself.
Frequently asked questions
What is a keyword gap analysis tool?
It is software that compares your site's ranking keywords against competitors' and lists the terms where they rank and you do not. Ahrefs calls it Competitive Analysis, Semrush calls it Keyword Gap, Surfer calls it Coverage Gap. The underlying job is the same.
What does a keyword gap tool cost?
Checked on 26 September 2026, a full keyword gap report costs $129 a month at Ahrefs (Lite) and $139.95 at Semrush (SEO), paid month to month. Tools that find gaps one topic at a time run from $49 at Frase to $219 at Surfer, which keeps Coverage Gap in its Pro plan. Budget for the plan that has the feature, and compare month-to-month prices with month-to-month prices.
What does a competitor keyword gap analysis service cost?
Compare any quote with doing it yourself: $129 a month for Ahrefs Lite or $139.95 for Semrush SEO, paid month to month and read on 26 September 2026, plus the hours it takes to review what the report finds. That review is the part worth paying a service for: checking the live results for each gap and deciding which few are worth writing. Ask any provider to show you that working before you compare fees.
Is there a free keyword gap analysis tool?
Not a serious one. Gap analysis needs a large ranking-keyword index for both your site and your competitors', and maintaining that index is the expensive part of the product. Free tiers generally cap you at a handful of lookups. Google Search Console is free and shows your own queries, but it cannot show you a competitor's, which is the whole point of a gap analysis.
Can AI find keyword gaps better than a traditional tool?
The finding step is a database query, not a reasoning problem, so AI adds little there. Where it helps is triage: classifying hundreds of gap keywords by intent and offer fit so a person only reviews the survivors. Treat any bulk AI classification as a first pass and check the ones you plan to act on against the live results page.
Which keyword gap analysis software is best for a small team?
If you need one subscription, Semrush covers the most ground. If you care most about competitor and link data, Ahrefs is stronger, and its $129 Lite plan includes Competitive Analysis. If you run gap analysis a few times a year, buy a single month when you need it instead of holding a subscription.
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