Semrush vs Ahrefs (September 2026): What the Data Says

Most Semrush vs Ahrefs comparisons hand you a feature checklist and a winner. This one starts with a problem you have probably seen yourself: point both tools at the same website on the same day and the numbers don't match. Not by a little. On one of our sites, Ahrefs reports 42 organic keywords and Semrush reports about 1,500.

So we ran the test on real sites. Both tools, on three sites we manage, first in July 2026 and again on August 1, cross-checked against the one source that isn't an estimate: Google Search Console. Running it twice tells you how stable each tool's numbers are; the Search Console check tells you which of them ran closer to reality.

Semrush vs Ahrefs: The Short Answer

Semrush is the all-in-one marketing platform of the two — SEO, AI visibility, paid search, content, local, and social in one account — and the better default for most buyers. Ahrefs is the focused specialist's tool, built around backlinks and organic research. If your work spans channels, or you run an agency, a marketing team, or a young site you want to watch grow, pick Semrush; it also reported far more ranking keywords on every site we tested, though broader coverage is not better accuracy. Pick Ahrefs if you are the SEO specialist in the room, the person whose whole job is links, rankings, and site audits, and you value a cleaner interface and more conservative numbers over breadth. If Semrush is where you land, the 7-day free trial is enough time to run every test in this article on your own site.

A couple of things hold no matter which you choose. First, the tools will disagree, often dramatically, because they track different keyword databases, SERPs, and traffic models. Second, neither number is the truth. For your own Google traffic, Google Search Console is the closest thing to ground truth, and both tools are best treated as competitive-intelligence estimates, not measurement. The rest of this article shows how far apart they run on our own sites.

We Ran Both Tools on the Same Three Sites

We pulled fresh numbers from our own paid Ahrefs and Semrush accounts for three sites we manage: geotoolbox.ai (our own small, new AI-visibility tool) plus two client sites we have kept anonymous — an established, mid-size manufacturer and a large marketplace. Same domains, same day, first in mid-July 2026 and again on August 1. Here is what each tool said about organic keywords on the August pull.

How we pulled this, so you can weigh it. Three sites is an illustration, not a study. Ahrefs figures are all-locations (our account is on the Lite tier, but plan tier limits row exports, not the headline counts, which come from the dashboard overview). Semrush's keyword figures use its worldwide database for geotoolbox and its US database for the two US-focused sites (the page counts below are Ahrefs all-locations against Semrush's US database). That scope is not perfectly matched, so treat the exact multipliers below as rough direction. The direction is what holds up.

One thing holds across all three: Semrush reports more keywords on every site, even on the two where it was restricted to a single US database. The size of the gap is where we are more cautious. In our sample it was widest on the smallest site (about 36 times) and narrower on the large one (about three times), which fits the idea that Semrush's database catalogs more of the long-tail and low-volume terms a young site picks up first. But that gradient rests on three points, and Semrush ran worldwide on the smallest site while restricted to the US on the two larger ones — a scope difference that happens to track site size — so test it on your own accounts before you rely on it.

The same pattern shows up in pages, with a caveat worth stating plainly because geotoolbox.ai publishes in both English and French. Ahrefs's all-locations report surfaces 22 ranking pages; Semrush's US database shows 106 (its US index does not see the site's French pages at all); and Google Search Console had around 225 URLs indexed in July — a count spanning every English and French blog post, glossary entry, and feature page the site publishes, not 225 articles. These are not the same measurement — ranking pages in one geographic scope versus Google's full multilingual index — so read them as three differently-framed slices of one site, not a clean ratio. What they agree on is the part that matters: no third-party tool sees the whole footprint, and Search Console comes closest to the full picture.

The reason is structural: each tool tracks a different universe of keywords, countries, and SERPs, on different refresh schedules and with different thresholds for what counts as a ranking keyword. A keyword count is database coverage, not verified visibility, accurate live positions, or traffic. Which raises the obvious question.

The Same Test, Twelve Days Later: How Each Tool's Numbers Move

Over twelve days, Semrush added roughly 400 keywords (+36%) and 14 ranking pages for our test site while Ahrefs added seven keywords (+20%) and two pages — and Ahrefs sharply revised its traffic estimate downward. A single same-day snapshot hides that kind of movement, so we kept both accounts pointed at geotoolbox.ai and re-pulled everything on August 1. (The client sites moved too, but a young site is where the difference between the two tools is most visible, so that is the one under the microscope.)

Both tools grew their picture of the site over the window; what differs is resolution. Semrush's catalog registered the site's recent publishing as hundreds of new keyword entries and a visible Authority Score move from 7 to 11, while Ahrefs's stricter thresholds recorded the same period as a handful of keywords. (DR and AS are separate proprietary scales that don't convert, so read each tool's movement only against itself.) If you publish weekly and want the dashboard to reflect that work while it is happening, Semrush is the one that shows it.

Ahrefs has two answers of its own, though. Its backlink crawler was the faster mover, going from 64 to 121 referring domains for the site against Semrush's 27 to 44, exactly what you would expect from the stronger link index. And its traffic estimate dropped from about 1,500 to 375, which looks erratic in isolation; hold that thought, because the next section, where both tools meet Search Console, is where it resolves.

On this site, over this window, the trade reads: Semrush shows you the progress first; Ahrefs waits for proof, then corrects hard. One site is not a pattern, but it is the behavior to watch for. For a new site owner deciding whether the content plan is working, the tool that registers movement is the more useful weekly companion, as long as you keep treating the traffic number as a model, not a meter.

Coverage Isn't Accuracy: What Google Search Console Showed

The extra keywords Semrush reports could be real reach or pure noise. To find out which, we pulled the actual clicks Google Search Console recorded for each site over the same 30-day window. GSC counts the real Google organic clicks your site received, not visits from every channel, which makes it the best first-party benchmark for exactly the thing the tools are trying to estimate.

The gaps are large. Note that these tool estimates are modeled monthly organic traffic while GSC is actual clicks over 30 days, so the two are not a perfect like-for-like; the point is the size of the gap, not a precise error rate. On the large site both tools ran 3.8 and 4.8 times over Google's 83,499 clicks: Ahrefs estimated 316,000 and Semrush 397,300. The mid-size manufacturer split them, with Ahrefs undershooting (2,700 vs 3,703 real) while Semrush ran high at 5,100. And the smallest site is where the August re-pull got interesting: Ahrefs, which had estimated around 1,500 in July, revised down to 375 — within a handful of clicks of the real 382 — while Semrush's 1,700 estimate sat about 4.5 times above reality. Semrush read higher than Ahrefs on all three sites, and Ahrefs ran closer to Search Console on all three — dramatically so on the smallest — at the cost of that big mid-July swing.

None of that makes either tool bad. It makes their "organic traffic" a modeled estimate, not a click counter. It also matches the most-cited public test on the question: a 2022 study in which Ahrefs checked its own US organic traffic estimates against Google Search Console on 1,635 websites and found a median deviation of 49.52% for Ahrefs and 68.36% for Semrush. One caveat, since we are the Semrush affiliate: Ahrefs ran and published that study, so read it as an interested party's finding, not a neutral referee. Its direction still lines up with what we saw — Semrush read higher on all three of our sites, and in that 2022 sample its estimates deviated more — and with what practitioners repeat constantly: the estimates are useful for spotting trends and comparing competitors, never for reporting your own traffic. For that, open Search Console.

The gap has a narrow practical use. Your own site's ratio of real Search Console clicks to a tool's estimate can roughly sanity-check that tool's number for a competitor, but only a competitor of similar size and market. Emphasis on rough: our three test sites show the error swinging from a near-exact match to nearly a five-times overshoot, so a ratio borrowed from one site will not transfer cleanly to a site of a different size or age. It is a gut check at best.

Keyword Research: Database Breadth vs Click Realism

The personality split shows up hardest here. Semrush's Keyword Magic Tool is built for breadth. It returns huge lists grouped into topic clusters with search intent attached, plus a Personal Keyword Difficulty score tuned to your domain. If your job is to find every angle on a topic and map coverage, Semrush surfaces more to work with, the breadth behind the larger keyword counts we saw.

Ahrefs Keywords Explorer is built for realism. Its signature metric is Traffic Potential: Ahrefs's estimate of the monthly organic traffic the current top-ranking page for a term gets from every keyword it ranks for, not just the head keyword's volume. It also reports a Clicks metric, its estimate of the average monthly search-result clicks a keyword generates, which accounts for zero-click searches as well as searches that produce several clicks. On a query where an AI Overview or featured snippet eats most of the clicks, that distinction is the difference between chasing a keyword and skipping it.

The database-size debate is mostly noise. Comparison articles quote keyword-database figures for the same tool that differ severalfold depending on who is writing, which tells you these numbers are unreliable marketing counts, not audited facts. Both tools index tens of billions of keywords; that is plenty. What differs is philosophy: Semrush is usually described as the more expansive, higher-volume counter and Ahrefs as the lower, more conservative one, which is the shape our own three-site test showed. Both approaches are defensible, and the AI answers you see today increasingly repeat both sets of figures as if they were settled, which they are not.

Verdict: Semrush for breadth and content planning, Ahrefs for judging whether a keyword will actually send clicks.

Backlinks: Where Ahrefs Still Earns Its Reputation

Ahrefs built its name on backlinks, and it is still the default for link work, but the "bigger index" story has flipped on paper. By each vendor's own self-reported (and take-with-salt) count, Semrush now advertises the larger raw number — around 43 trillion links, against the external-backlinks history Ahrefs publishes on its own big-data page — though the two are counted under different definitions, so treat both as marketing figures. In a third-party ten-domain test, Style Factory found Semrush reported more referring domains on nine of them, including Amazon (4.4 million vs Ahrefs's 2.2 million).

Then look at our own smallest site and it flips the other way. For geotoolbox.ai, Ahrefs finds 121 referring domains and Semrush finds 44, and over our two-pull window Ahrefs picked up the site's new links faster (the movement table above has the exact deltas). Same site, and the tool with the "smaller" index found nearly three times as many referring domains. The counts disagree in both directions, and raw index size tells you very little.

Practitioners often reach for a neutral yardstick here: Cloudflare Radar's bot directory, which ranks crawlers by the traffic Cloudflare actually observes across its network. When we checked on August 7, 2026, AhrefsBot was the highest-placed SEO crawler on the list at number 13 overall by traffic volume, one place ahead of Semrush's backlink crawler, SemrushBotBacklinks, at 14. It is a snapshot, and the order moves.

What separates them is quality and history. Ahrefs refreshes its link index constantly and keeps years of historical data, and its crawler has long been the practitioner favorite for link audits, disavow work, and finding a competitor's best links. A huge index full of dead or spammy links is worse than a smaller, cleaner one. If backlinks are the core of your work, Ahrefs remains the safer default, and our best link building platforms guide covers the outreach tools that sit on top of whichever index you use. If you want backlinks as one part of a wider suite, Semrush's data is now genuinely competitive on volume.

Everything Else: Audits, Rank Tracking, PPC, Local, Content

Outside keywords and links, the split is simpler: Semrush does more things, Ahrefs does fewer things with a cleaner interface. This is the all-in-one platform versus focused specialist trade-off, and it decides most purchases.

The table reads as a Semrush sweep, and on feature count it is one. But breadth has a cost: Semrush's local, agency, and AI features are often paid add-ons on top of the base plan, and the interface carries the weight of doing everything. Ahrefs does less on purpose, and people who live in it every day tend to prefer that focus. If your work is genuinely just organic search and links, you are paying for modules you will never open.

One ownership change is worth knowing before you commit. Semrush is now an Adobe company: Adobe completed its acquisition on April 28, 2026, and says it will fold Semrush's data into its enterprise marketing stack. If your team already runs on Adobe, that direction is a genuine plus for the all-in-one case. Some practitioners in SEO forums went the other way after the announcement, renewing with Ahrefs — now the only independent of the two — on pricing-and-roadmap wariness under new ownership. Neither reaction changes what the tools measure today, but it is part of the 2026 buying picture.

AI Search Visibility: Where Semrush Pulled Ahead in 2026

This is a big reason Semrush now wins the "which one platform" question on integration and entry price for anyone whose audience is moving into AI answers. With a growing share of searches ending inside an AI answer instead of a blue link, whether you show up when ChatGPT, Gemini, or Google's AI Mode answers a question in your market is no longer a bonus metric. Both tools track it. They do not do it the same way.

Semrush's answer is the AI Visibility Toolkit, and it is the better-packaged, better-integrated of the two. It scores your brand with an AI Visibility Score (a 0–100 benchmark of how often AI answers mention you versus the median of your top competitors) and a Share of Voice percentage, across ChatGPT, Google AI Mode, Google AI Overviews, Gemini, and Perplexity, per Semrush's plan documentation. Prompt Research surfaces the prompts worth owning and who competes on them; a cited-sources breakdown shows which pages the engines actually pull from; daily Prompt Tracking follows 25 custom prompts so you can benchmark competitors and watch shifts over time; and since Semrush's 2026 repositioning the toolkit has grown into a full AI Visibility section of the app, with brand-performance, perception, and brand-sentiment reports alongside the tracking. If you already run a Semrush SEO plan, that AI layer is a separate purchase (pricing below); the Semrush One bundles from $199/mo fold it in. Either way it sits in the same account as your keyword, backlink, and content data, which is the unified AI-plus-SEO pitch.

Ahrefs answers with Brand Radar, and on raw engine coverage it is actually the wider of the two: it adds Microsoft Copilot, Grok, and Claude on top of the same ChatGPT / AI Overviews / AI Mode / Gemini / Perplexity set (plus non-AI discovery surfaces like TikTok), backed by a 472M-plus prompt database, with its own competitor benchmarking and custom prompt tracking. That width comes with two asterisks: the Grok index is currently paused (Ahrefs says it cannot gather new Grok data right now), and Claude queries burn extra checks. Where Brand Radar loses is packaging and price.

Two caveats before you read that table as a clean Semrush sweep. First, the AI Visibility Toolkit is sold separately — it is not folded into Pro, Guru, or Business, so it is a real line on the bill; where it wins is packaging and the entry price for the full visibility suite, not broader engine coverage. Note the units differ, too: Semrush's $99 is per domain and multiplies across a client roster, while Ahrefs's $199/$699 is per platform index, so a multi-brand agency should run its own math. Second, both tools model AI visibility with simulated prompts rather than watching real user sessions, so treat their scores the way you treat their traffic estimates: excellent for your own trend line and for comparing competitors, not a literal count of every time a human saw your name. (One small asterisk from our own account: the toolkit's Distribution by LLM panel showed data for four of the five documented engines — Perplexity had nothing for our domain yet.)

We also ran this layer on a site we own. Point both tools at the same brand and they surface AI citations a Google-clicks report never registers. geotoolbox.ai earns around 380 Google clicks a month after roughly two and a half months of publishing — still a tiny number — yet both tools flag it turning up in AI answers.

The counts, as of August 1: Ahrefs logged 95 ChatGPT responses across 15 of its pages, up from 29 across 9 in July. Semrush's AI Visibility Toolkit logged 39 citations across 25 cited pages, up from 31 across 19. Ahrefs's Site Explorer overview also now carries a free per-platform AI index, a genuinely useful addition that showed 108 Copilot and 64 Perplexity responses for the same site. Those are different units and don't compare head-to-head, but together they make the point concrete: for an AI-first brand, keyword count is a progress signal, while whether engines actually cite you is a separate question that AI-visibility tools are built to measure.

Then we pulled the same site's first-party data from Bing Webmaster Tools, whose AI Performance report logs citations made inside Microsoft's Copilot ecosystem. It counted 15,300 citations across an average of 24 cited pages in three months — orders of magnitude above the 95 responses and 39 citations the two suites logged. Bing calls its own figure a sample, and it covers a different engine, period, and unit than the suites' simulated prompts, so this is not a scoreboard. What it shows is scope: the suites sample a fixed prompt set across their engine panels (Ahrefs's includes Copilot, but samples it), while Bing logs live citations inside its own ecosystem. No single source sees everything.

So the workflow is the one this article keeps arriving at: lean on the suites (Semrush's toolkit or Ahrefs's) to track your trend and watch competitors, and cross-check against the first-party data the platforms report — Bing Webmaster Tools now, Google's as it lands — plus an independent cross-engine read, remembering each is its own partial slice. To go deeper on the AI side specifically, we cover how to read AI share of voice, why engines fan one prompt into dozens of sub-questions (exactly why wide keyword coverage still helps here), and how the dedicated AI visibility tools stack up.

Pricing: What You'll Actually Pay in 2026

Sticker prices are close at every tier. The real difference is what sits on top: Ahrefs's cheaper plans meter usage with credits, while Semrush charges add-ons for extra users, local, and AI visibility. Here are the core plans, verified against each vendor's pricing page in August 2026. Confirm current numbers before you buy, since both change often.

A few things the table hides. Semrush's public pricing page — now titled "SEO & AI Search Plans and Pricing" — shows only an entry "SEO" plan (the classic Pro renamed, and repriced from $139.95 to $139) next to its One bundles; Guru and Business no longer appear on public pricing and persist in the docs and for existing subscribers. Our full Semrush review breaks down what that changes. Ahrefs's entry Lite plan is affordable but credit-metered (1,000 credits per user), and those credits burn fast in a deep research session, while its higher tiers move to unlimited credits but keep other export and project limits. Semrush's headline price is the base; extra seats are a paid add-on, and its AI Visibility Toolkit is a separate line item at $99/mo per domain, the same price on either billing term, or bundled with SEO in the Semrush One tiers ($199, $299, or $549/mo), so an agency's real bill climbs above the sticker. Both suites discount annual billing (Semrush by up to about 17%). And Ahrefs offers no classic time-boxed free trial (its free access is Ahrefs Free, the renamed Webmaster Tools, for sites you own), which matters if you want to test before committing.

If Semrush's breadth is the fit and you want to run this same three-site test on your own accounts, its SEO Toolkit starts at $139 a month (less billed annually) and there is a 7-day free trial to try it first. On a tight budget, start with our best free SEO tools guide before paying for either.

So Which One Should You Buy?

Match the tool to how you work rather than to a scoreboard. If Semrush is the direction you are leaning, our full Semrush review goes deeper on its 2026 pricing, the AI Visibility Toolkit, and the billing complaints worth knowing before you subscribe.

The plain verdict: for most people buying one tool in 2026, Semrush is the default, because most of them are not pure SEOs. It is the all-in-one marketing platform of the pair, it shows a small site more of its own footprint sooner — remembering that broader coverage is not better accuracy — and its AI-visibility layer comes from the same vendor as everything else. Ahrefs is the better buy for the SEO specialist: if you spend your days in backlink profiles and organic research and want conservative numbers in an uncluttered tool, its focus is exactly the point. Neither will report your real traffic, so keep Search Console open next to whichever you choose.

One last thing, because it is the reason we ran this test at all. If your visibility is moving into AI answers, the tool question is only half of it. Of the two, Semrush has pushed AI visibility furthest into its platform: its AI Visibility Toolkit pulls citation tracking, Share of Voice, and daily prompt monitoring into the same account as the SEO data. For a site like ours, whose Google clicks are tiny but whose name turns up in AI answers, that layer is the one worth watching most. Run the 7-day Semrush trial to pull your own numbers, then check them against Search Console and an independent AI-citation read — the disagreement between the three tells you more than any single tool will.

Frequently Asked Questions

Which is better, Semrush or Ahrefs?

For most people buying one tool, Semrush is the better pick because it is an all-in-one marketing platform: SEO, paid search, content, local, and AI visibility in one account, and it surfaces more keywords on every site we tested. Ahrefs is better for SEO specialists whose work is led by backlinks and organic research and who prefer a cleaner interface with more conservative numbers. Neither reports your real traffic, so pair whichever you choose with Google Search Console.

Why do Semrush and Ahrefs show different keyword counts for the same site?

Because they track different keyword databases, update schedules, and definitions of a ranking keyword. Semrush cataloged more terms on every site we tested; we did not test which query types drove the difference. In our data the gap ranged from about 3 times more on a large site to 36 times more on a small new site. On our smallest site the gap widened between pulls (31x to 36x, with Semrush adding roughly 400 keywords to Ahrefs's seven); on the two larger sites it narrowed slightly.

Does Semrush track AI search visibility?

Yes. Semrush's AI Visibility Toolkit tracks how your brand appears across ChatGPT, Google AI Mode and AI Overviews, Gemini, and Perplexity, with an AI Visibility Score, Share of Voice, Prompt Research, cited-source breakdowns, and daily tracking of 25 custom prompts for competitor benchmarking. It is priced separately ($99/mo per domain, the same price monthly or annually, or bundled with SEO in Semrush One from $199/mo), not part of the standard SEO plans. Ahrefs offers similar tracking through Brand Radar across an even wider engine set (it adds Copilot, Grok, and Claude, plus non-AI discovery surfaces like TikTok), but its full per-platform indexes are pricier ($199/mo each, or $699/mo for all platforms), with prompt-only add-ons from $50/mo.

Do you need both Semrush and Ahrefs?

Most people do not. The overlap is large, and one tool plus Google Search Console covers the core job. Teams that do serious link building sometimes keep Ahrefs for its backlink index alongside Semrush for everything else, but paying for two full subscriptions is a cost most solos should skip.

Is there a free alternative to Semrush and Ahrefs?

Google Search Console and Google Keyword Planner are free and cover your own rankings and basic keyword volumes. Both tools also offer limited free tiers, and free graders exist for specific jobs. Our best free SEO tools guide covers the ones worth starting with before you pay, and our Semrush alternatives and Ahrefs alternatives guides compare the cheaper paid options by job.

Which is better for a new or small website?

Semrush, in most cases. In our own test it cataloged many more of the keywords our young site was picking up, so you see progress Ahrefs may not register yet. On our own new site, Semrush's keyword count grew by hundreds between our two pulls while Ahrefs's grew by seven, and its Authority Score moved from 7 to 11 (the two authority scores are separate proprietary scales, so read each against itself). If budget is the deciding factor, Ahrefs has a limited $29 Starter tier while both full plans cost about the same at entry, so lean on the free options (Search Console, Keyword Planner, and each tool's free access) first. Either way, treat the traffic estimates as directional until Search Console has enough data.

More Questions

Can you trust Semrush's traffic numbers?

Trust them for relative comparison and trend direction, not as literal visits. In our August 2026 test across three sites, Semrush's organic-traffic estimate ran higher than Ahrefs's on all three and overshot actual Google Search Console clicks on each; Ahrefs overshot the largest site badly too, but landed within a few clicks of reality on our smallest site after a sharp downward revision. Both tools model traffic from rankings and click curves; only Search Console counts your real clicks.

Sources

• How Accurate Are the Search Traffic Estimations in Ahrefs? (New Research) - Ahrefs (Tim Soulo), May 2022 - ahrefs.com/blog/traffic-estimations-accuracy
• Semrush One vs SEO Toolkit plans comparison (pricing and AI engine coverage) - Semrush, August 2026 - semrush.com/kb/1624-semrush-one-vs-seo-toolkit
• SEO & AI Search plans and pricing (replaced the SEO Classic plans page) - Semrush, checked August 3, 2026 - semrush.com/pricing/seo-ai-search/
• AI Visibility Toolkit (features and pricing) - Semrush, August 2026 - semrush.com/kb/1493-ai-visibility-toolkit
• Brand Radar (AI-visibility features, coverage, and pricing) - Ahrefs, August 2026 - ahrefs.com/brand-radar and help.ahrefs.com/en/articles/11064852-what-is-brand-radar-and-how-to-use-it
• Adobe Completes Semrush Acquisition - Adobe press release, April 28, 2026 - news.adobe.com/news/2026/04/adobe-completes-semrush-acquisition
• Bot traffic directory, ranked by traffic volume - Cloudflare Radar, August 2026 - radar.cloudflare.com/bots/directory
• AI Performance report (first-party AI-citation data for geotoolbox.ai; Bing labels the figures a sample of overall activity, sourced from Microsoft Copilots and partners) - Bing Webmaster Tools, August 2026 - bing.com/webmasters
• Ahrefs Pricing - Ahrefs, August 2026 - ahrefs.com/pricing
• Ahrefs vs Semrush (2026) - Which Should You Use? (10-domain referring-domain test) - Style Factory, updated July 2026 - stylefactoryproductions.com/blog/ahrefs-vs-semrush
• Google Search Console (ground-truth click data) - Google - search.google.com/search-console/about
• First-party account data for geotoolbox.ai and two anonymized client sites, pulled from our own Ahrefs, Semrush, Bing Webmaster Tools, and Google Search Console accounts, July 20 and August 1, 2026.