9 Best Tools for Content Gap Analysis in 2026, Compared

Quick comparison

The best content gap analysis

#1

Semrush

Best for: Content teams that want the widest keyword-gap data plus rank tracking in one subscription

Visit semrush.com

Starting price$139.95/month (SEO plan, billed monthly; $117.33/month billed annually)

Free planYes — free account (1 project, limited)

Semrush runs the best-known keyword-gap workflow in this list: its Keyword Gap tool lines your domain up against up to four competitors and shows exactly which keywords they rank for and you do not. The SEO plan costs $139.95 a month and covers 5 projects and 500 keywords tracked daily, plus Position Tracking, Site Audit and the Keyword Magic Tool, so the gap work and the tracking live in one subscription.

The catch is the AI visibility split. The SEO plan tracks AI search and sentiment but carries no prompt-tracking quota, so prompt tracking waits for Starter at $199 a month or the $99-a-month AI Visibility Toolkit. Extra users start at $45 a month. Buy Semrush when you want the gap report and the rank tracking in one place and you can live without prompt tracking on the entry plan.

What we like

• Keyword Gap compares your domain with up to four competitors and shows the exact keywords you are missing
• 500 keywords tracked daily and Site Audit included on the entry SEO plan
• Keyword Magic Tool and Position Tracking included, so gap work and tracking stay in one subscription
• 7-day free trial and a limited free account with one project

Watch out for

• No prompt-tracking quota on the SEO plan — AI visibility tracking starts at $199 a month
• The dearest entry price here at $139.95 a month, and extra users start at $45 a month
• The plan names changed in 2026, so older Pro/Guru/Business comparisons no longer match the pricing page

#2

Ahrefs

Best for: SEOs who want the cleanest Content Gap report and the deepest backlink data behind it

★★★★★★★★★★4.5/5 on G2 (723 reviews, checked Nov 2026)

Visit ahrefs.com

Starting price$29/month (Starter, monthly billing only)

Free planYes — free tier for verified sites you own

Ahrefs' Content Gap report is the simplest in this list: pick your site and up to ten competitors, and it returns the keywords they rank for that you do not, with the ranking page for each one. Starter costs $29 a month and includes Site Explorer, Keywords Explorer, Site Audit and Rank Tracker, so the gap work sits on top of the deepest backlink index here.

The limit is the credit meter. Starter gives you 200 credits a month, and every report you open spends one, so a full gap analysis across a large site can eat a noticeable share of the allowance. Rank Tracker also updates weekly, not daily. Buy Ahrefs when the gap report is the job and you work in short, focused sessions rather than all-day research.

What we like

• Content Gap report shows the keywords competitors rank for that you do not, in one click
• The deepest backlink index here backs every gap finding with link data
• Free tier for verified sites you own, with Site Audit and Site Explorer access
• Rank Tracker and Site Audit included even on the $29 Starter plan

Watch out for

• Starter runs on 200 credits a month — a full gap analysis across a large site eats the allowance fast
• Rank Tracker updates weekly, not daily, on every plan
• No free trial on paid plans, and extra users cost $40 a month each on Lite

#3

Surfer

Best for: Writers and small teams that optimize pages against the top-ranking results

Visit surferseo.com

Starting price$59/month (Discovery, billed monthly; $49/month billed annually)

Free planNo — 7-day free trial

Surfer is built for the second half of the gap job: fixing the pages you already have. Its Content Editor scores each draft against the live top-ranking pages as you write, and Content Audit flags pages that lost ground and tells you what to change. Discovery costs $59 a month and includes 120 documents a year and tracking for 10 pages, with WordPress and Google Docs integrations.

Discovery is a one-seat plan with no AI prompt tracking, so AI visibility waits for Standard at $119 a month. The 120-document yearly pool also means about two articles a week, with no room for rewrites. Buy Surfer when your problem is pages that already exist but no longer rank, and you want the fix spelled out while you write.

What we like

• Content Editor scores drafts against the live top-ranking pages as you write
• Content Audit flags pages that lost ground and tells you what to fix
• 120 documents a year on Discovery, enough for about two optimized articles a week
• WordPress, Google Docs and Contentful integrations included on every plan

Watch out for

• Discovery tracks zero AI prompts — AI visibility starts on Standard at $119 a month
• One seat only on Discovery, so a second writer needs a higher plan
• The 7-day trial needs a card up front and rolls into $59 a month if you forget to cancel

#4

Clearscope

Best for: Content teams that grade drafts against live SERP data and track content decay

★★★★★★★★★★4.9/5 on G2 (92 reviews, checked Nov 2026)

Visit clearscope.io

Starting price$129/month (Essentials, billed monthly)

Free planNo — free trial

Clearscope grades your content against live SERP data and shows the grade in Google Docs or Word as you write, which is why content teams that publish daily like it. Essentials costs $129 a month and includes 50 tracked queries, 50 pages, 20 monthly Discoveries and 20 monthly Drafts, with unlimited users and projects on every plan.

The meter is the report credit: 20 drafts a month is the hard limit, and heavy publishers need Business at $399 a month for more. There is no free plan, only a trial, and the recommendations come from keyword relevance rather than your site's own topic authority. Buy Clearscope when writers need a live grade in the document, not another dashboard to check.

What we like

• Content grades and keyword relevance scores update live as you write in Google Docs or Word
• Content Inventory tracks grades across your whole site and flags pages losing ground
• Unlimited users and projects on every plan, including Essentials
• Discoveries surface new content opportunities from search intent data each month

Watch out for

• $129 a month buys only 20 drafts and 20 discoveries — heavy publishers pay $399 for Business
• No free plan, and report credits are the hard limit on every tier
• Recommendations come from keyword relevance, not from your own site's topic authority

#5

Frase

Best for: Small teams that want content briefs, audits and AI visibility tracking in one loop

Visit frase.io

Starting price$49/month (Starter, billed monthly; $39/month billed annually)

Free planNo — 7-day free trial

Frase is the only tool here that runs the whole loop on its entry plan: research the gap, write the brief, audit the published page and track whether AI engines cite it. Starter costs $49 a month and covers 10 articles a month, 50 audit pages, 20 AI visibility prompts a day and Content Guard on 10 pages, with a 7-day trial of the full Professional feature set.

The ceilings are close together: 10 articles a month is enough for one site on a steady cadence, but a second site or a busier calendar needs Professional at $103 a month. White-label reports and branded client portals are Enterprise only. Buy Frase when you want one subscription to carry the gap work from research to AI citation, without buying a second tool.

What we like

• Content briefs, audits and AI visibility tracking run in one loop on the entry plan
• Starter tracks 20 AI visibility prompts a day across ChatGPT and Google AI
• Content Guard watches 10 pages for rank and traffic decay and proposes the fix
• 7-day free trial of the full Professional feature set, with no card to start

Watch out for

• Starter covers 10 articles a month — a second site or a busier calendar needs Professional at $103
• White-label reports and branded client portals are Enterprise only
• AI generations are capped at 25 a month on Starter

#6

MarketMuse

Best for: Content strategists who plan by topic authority across a whole site inventory

★★★★★★★★★★4.6/5 on G2 (216 reviews, checked Nov 2026)

Visit marketmuse.com

Starting priceCustom quote (paid plans; free plan available)

Free planYes — free plan (10 queries/month)

MarketMuse works from the site outward rather than the keyword inward: its inventory lists every page and topic on your site, scores each one for Personalized Difficulty and Topic Authority, and shows which topics you have not covered at all. The free plan gives you 10 queries a month, Topic Navigator and SERP X-ray at $0, which is enough to run a first gap check before you talk to sales.

The paid plans are all custom-quoted, so you cannot budget from the pricing page — you have to request a price. The depth of data also makes the first weeks slow, and there is no AI prompt tracking on any plan. Buy MarketMuse when you plan content by topic authority across a whole site and want the inventory to tell you what to write next.

What we like

• Site inventory shows every page, topic and gap across your whole site in one view
• Personalized Difficulty and Topic Authority score topics against your own site, not a generic baseline
• A genuinely free plan with 10 queries a month, Topic Navigator and SERP X-ray
• Content briefs in nine formats, from articles to product reviews

Watch out for

• No published prices — every paid plan is a custom quote, so budgeting needs a sales call
• The depth of data makes the first weeks slow; reviewers call the learning curve steep
• No AI prompt tracking, so AI visibility needs a separate tool

#7

SE Ranking

Best for: Small agencies that want gap research, rank tracking and content briefs at one price

Visit seranking.com

Starting price$129/month (Core, billed monthly; $103.20/month billed annually)

Free planNo — 14-day free trial

SE Ranking packs the most into one entry price: competitor research, rank tracking, content briefs and AI visibility tracking all sit on the Core plan at $129 a month. It covers 10 projects, 2,000 keywords tracked daily, 25 content articles and 25 AI prompts a day across 5 engines, with a 14-day free trial of the full feature set.

The trade-off is scale. Core's 2,000 tracked keywords is the smallest allowance among the all-in-one suites here, and white-label reporting needs the $69-a-month Agency Pack add-on. Extra keywords and seats are billed on top. Buy SE Ranking when a small agency wants gap research, tracking and briefs in one subscription and can live with the keyword cap.

What we like

• Competitor research, rank tracking and content briefs in one plan from $129 a month
• AI visibility tracking included on Core: 25 prompts a day across 5 AI engines
• Content Marketing module writes briefs from SERP data, with 25 articles on Core
• 14-day free trial covers the full feature set

Watch out for

• White-label reporting needs the $69-a-month Agency Pack add-on
• 2,000 tracked keywords on Core is the smallest allowance among the all-in-one suites here
• Extra keywords and seats are billed on top, so the bill grows with the portfolio

#8

Serpstat

Best for: Budget buyers who want competitor keyword comparison without a suite price

Visit serpstat.com

Starting price$69/month (Individual, billed monthly; $50/month billed annually)

Free planNo — 7-day free trial

Serpstat is the budget route into competitor keyword comparison: Individual costs $69 a month and covers 5 projects, 100 lookups a day, 10,000 position checks a month and 30,000 audit pages, with keyword research backed by 230 Google databases. A 7-day free trial is included on Individual and Team, so you can run a real gap check before paying.

There is no AI visibility tracking on any plan, and API access starts on Team at $129 a month rather than Individual. Site Audit also skips JavaScript rendering on Individual. Buy Serpstat when the budget is the deciding factor and the job is comparing competitor keywords, not tracking AI citations.

What we like

• Competitor keyword comparison at $69 a month, about half the price of the big suites
• 5 projects, 100 lookups a day and 30,000 audit pages a month on Individual
• 230 Google databases behind the keyword research
• 7-day free trial on Individual and Team

Watch out for

• No AI visibility tracking on any plan
• API access starts on Team at $129 a month, not Individual
• JavaScript rendering in Site Audit needs Team or higher

#9

Moz Pro

Best for: Solo SEOs who want Domain Authority and simple competitive keyword research

Visit moz.com

Starting price$49/month (Starter, billed monthly; $39/month billed annually)

Free planNo — no free trial on Starter

Moz Pro is the simplest suite here, and the cheapest entry among the big all-in-one tools at $49 a month. Starter covers 1 campaign, 50 tracked keywords and 1 site, with Keyword Explorer's Priority Score ranking each gap opportunity by value and Domain Authority — the metric the whole industry quotes — behind every comparison.

The limits are tight: 50 tracked keywords and one site make Starter a trial-sized plan for most teams, and the working plan is Standard at $99 a month. There is no free trial on Starter, extra seats cost $49 a month each, and there is no dedicated content-gap report. Buy Moz Pro when you want simple competitive keyword research with the industry's standard authority metric.

What we like

• Domain Authority is the metric the whole industry quotes, and it lives here
• Keyword Explorer's Priority Score makes it easy to rank gap opportunities by value
• The cheapest entry price among the big all-in-one suites at $49 a month
• AI-powered keyword suggestions included on every plan

Watch out for

• Starter covers 1 site and 50 tracked keywords — a working plan for most teams is Standard at $99
• No free trial on Starter, and extra user seats cost $49 a month each
• Campaigns update weekly, not daily, and there is no dedicated content-gap report

The best tool for content gap analysis shows you the topics your competitors rank for and you do not, then tells you which gaps are worth filling first. We compared nine tools that do that job — from all-in-one SEO suites to dedicated content optimizers — and ranked them by fit for the most common buyer: a content marketer or SEO who needs a gap list they can act on this week, not a research project. Every price was checked on the vendor's own pricing page on November 4, 2026.

How to choose the best tool for content gap analysis

• Start with the gap you need to find. A keyword gap compares the terms competitors rank for; a content gap compares what your pages cover against the top results. Suites do the first, optimizers do the second — most teams need both, so check which half each tool covers.
• Count the credits, not the features. Ahrefs Starter gives 200 credits a month, Surfer Discovery gives 120 documents a year, and Clearscope Essentials gives 20 drafts a month. The cap you hit first is your real price.
• Check whether your pages are compared, not just keywords. Surfer, Clearscope and Frase audit your existing pages against the live top 10; the suites mostly compare keyword lists. If your job is fixing old pages, the audit matters more than the keyword list.
• Decide if AI visibility is part of the job. Frase and SE Ranking track AI prompts on the entry plan; Semrush's entry plan does not, and Surfer Discovery tracks none. Buying a second AI tracker later costs more than the upgrade.
• Think about who else reads the output. Agencies need white-label reports and client seats, which sit on higher tiers or add-ons everywhere here — budget for them now, not after the first client report.

Content gaps are only half the visibility problem — the pages you already have also need to be found. Our AI search optimization service covers the side these tools do not: making sure AI assistants cite your pages once the gaps are filled. And before you write the new pages, run your titles through the free SERP snippet preview tool — it shows exactly how the title and description will look in Google.

Content gap analysis pricing: what you will actually pay

Take a solo content marketer who runs a keyword-gap check against four competitors every month and optimizes two articles a week. On monthly billing, the year costs $348 on Ahrefs Starter, $588 on Frase Starter or Moz Pro Starter, $708 on Surfer Discovery, $828 on Serpstat Individual, $1,548 on Clearscope Essentials, SE Ranking Core or Ahrefs Lite, and $1,679.40 on Semrush SEO. MarketMuse has no published price, so it is the one quote you have to request.

Two of those numbers need adjusting before they are real. Ahrefs Starter's 200 credits a month will not survive a monthly gap check across four competitors plus regular research, so the realistic Ahrefs floor is Lite at $1,548 a year. Surfer Discovery's 120 documents a year is exactly two articles a week, with no room for rewrites. Annual billing cuts the bill on most tools here: Frase Starter drops from $588 to $468 a year, Moz Pro Starter from $588 to $468, Surfer Discovery from $708 to $588, Serpstat Individual from $828 to $600, SE Ranking Core from $1,548 to $1,238.40, and Semrush SEO from $1,679.40 to $1,407.96. Clearscope publishes no annual discount, so $1,548 is the price either way.

The cheapest working setup is Frase Starter at $468 a year on annual billing — briefs, audits and AI prompt tracking in one subscription — while the dearest is Semrush SEO at $1,407.96, which buys the widest gap data and daily rank tracking in the same login.

Know the difference: keyword gap vs content gap

The confusion in this category is between two different gaps. A keyword gap is a list of search terms your competitors rank for and you do not — Ahrefs' Content Gap and Semrush's Keyword Gap produce exactly that list. A content gap is the difference between what your page covers and what the top-ranking pages cover — Surfer's Content Audit, Clearscope's grades and Frase's audits measure that. The first tells you what to write; the second tells you how to fix what you already wrote.

Suites like Semrush, Ahrefs, SE Ranking, Serpstat and Moz Pro are built for the keyword gap. Optimizers like Surfer, Clearscope and Frase are built for the content gap. MarketMuse sits in between: its inventory shows which topics you have not covered at all, which is a keyword gap seen from the topic side. Most content teams need both halves, which is why the common setup is one suite for the keyword gap plus one optimizer for the page fixes — and why the cheapest single-tool answer, Frase Starter at $49 a month, tries to do both in one subscription.

Quick comparison: tool type by need

Mistakes to avoid

• Buying on the headline price and hitting the credit cap in week two. Ahrefs Starter's 200 credits, Surfer's 120 documents a year and Clearscope's 20 drafts a month are the real limits — size the plan by the work you will actually do.
• Confusing a keyword list with a content plan. A gap report tells you which terms you are missing; it does not tell you how long the article should be or what it should cover. Budget for the optimizer or the brief, not just the list.
• Paying for AI visibility twice. If prompt tracking matters, pick a tool that includes it on the entry plan — Frase or SE Ranking — instead of buying Semrush SEO and then adding a separate AI tracker.
• Ignoring the free plan that already answers the question. MarketMuse's free plan and Ahrefs' free tier for sites you own can run a first gap check at $0, which is enough to learn whether the paid plan is worth it.
• Forgetting the second site. Most entry plans cover one site or one project; a second site is a second subscription or a higher tier on nearly every tool here.

How we chose

We checked each vendor's own pricing page on November 4, 2026 and recorded the starting price exactly as shown, including the annual-billing figure where the page lists one, and we ranked the tools by fit for the most common buyer — a content marketer or SEO running regular gap analysis — not by brand size. Two prices could not be read on the vendor's own page today: Moz Pro's pricing page would not load, and Serpstat's pricing page returned an error, so both figures come from independent reads of those pages in October 2026 that agree with each other, and we flag them here rather than presenting them as verified today. Semrush's pricing page loaded but renders its prices by script, so its $139.95 figure is corroborated by independent reads of the same page from late October 2026. Ratings come only from G2 pages we opened on November 4, 2026; where the G2 page would not load or the rating could not be read, we show no rating at all. No vendor paid for a place in this list, and none of the links here are affiliate links.

What to do next

Start with the free option: run one gap check on MarketMuse's free plan or Ahrefs' free tier for a site you own, and see whether the missing topics match what you suspected. Then trial your top pick with real data — one competitor set, one month of fixes — and check that the recommendations change what you actually publish. If the gaps are clear but new customers are not finding you, our monthly SEO service handles the visibility side — or compare providers in our guide to SEO companies for small business. Once your tools are in place, find out what's holding your rankings back.

Sources we checked (12)

• Semrush pricing — semrush.com/pricing (checked November 4, 2026)
• Ahrefs pricing — ahrefs.com/pricing (checked November 4, 2026)
• Surfer pricing — surferseo.com/pricing (checked November 4, 2026)
• Clearscope pricing — clearscope.io/pricing (checked November 4, 2026)
• Frase pricing — frase.io/pricing (checked November 4, 2026)
• MarketMuse pricing — marketmuse.com/pricing (checked November 4, 2026)
• SE Ranking pricing — seranking.com/pricing.html (checked November 4, 2026)
• Serpstat pricing — serpstat.com/pricing (returned 404 on November 4, 2026; price from independent reads of the vendor page, October 2026)
• Moz Pro pricing — moz.com/products/pro/pricing (would not load on November 4, 2026; price from independent pricing trackers that agree)
• Ahrefs on G2 — g2.com/products/ahrefs/reviews (checked November 4, 2026)
• Clearscope on G2 — g2.com/products/clearscope/reviews (checked November 4, 2026)
• MarketMuse on G2 — g2.com/products/marketmuse/reviews (checked November 4, 2026)