Ahrefs Brand Radar vs Semrush AI Visibility Toolkit (2026): Checks vs Prompts, Two Indexes, and What Engines Say

01The short answer

If you already pay for one suite, buy that suite’s AI product: Ahrefs customers get Custom Prompts included and the index for a click; Semrush customers get the toolkit as a $99 line or inside Semrush One. The switching cost is the whole suite, and neither toolkit is worth switching suites for on its own.

If you are choosing from scratch, Semrush is the cheaper first look at any brand’s visibility, $99 for the index and 25 prompts against $199 for Ahrefs’ index. Ahrefs is the cheaper way to track a real prompt programme daily, $50 for 2,500 checks, and the only one of the two that lists Claude. Both are measurement; the fix is yours to write.

02Pricing on the day: two products each

We read ahrefs.com/brand-radar and ahrefs.com/pricing through a paid proxy and semrush.com/pricing/ai/, semrush.com/pricing/ and Semrush’s Knowledge Base through the free fetcher, all on 4 September 2026. The full teardown of each is in the two reviews linked at the bottom; the table holds what you need to compare them.

03Checks vs prompts, priced out

The same programme costs very different amounts on the two meters, and the meters are the honest comparison. Ahrefs’ own examples are 80 prompts daily on one platform for $50 and 100 prompts daily on two platforms for $100. Semrush prints prompts and leaves the engine multiplier unstated, so the Semrush rows below assume one prompt is one prompt regardless of engines, which is the most favourable reading and should be confirmed.

Read the table and the headline flips. Semrush is cheaper for the first small programme and for market visibility; Ahrefs is cheaper for anything with more than 25 prompts or more than one brand, because checks scale linearly and Semrush’s domains and seats do not pool. The one caveat is the unstated Semrush multiplier: if a prompt on three engines consumes three of the 25, the Semrush rows roughly triple.

04Two indexes: 462 million vs 317 million prompts

Both vendors did the thing no dedicated tracker can: they built a corpus of prompts from search data and ran it through the engines, so you can type any brand and see its visibility without configuring anything. Ahrefs’ page puts its index at 462 million prompts, expanded from its keyword database with People Also Ask and semantic fan-out, run through ChatGPT, Perplexity, Gemini, Copilot, AI Overviews and AI Mode, with a second search-query index of short queries that triggered an AI answer in Google. Semrush’s Knowledge Base puts its database at over 317 million prompts and responses on ChatGPT, Gemini, AI Overviews and AI Mode across 117 regional databases, sourced from AI search clickstream data and Google’s AI Overviews keyword set, updated daily on a rolling basis, with responses captured from real requests and not via APIs.

Both then estimate demand. Ahrefs has switched Brand Radar to AI-adjusted volume per an Ahrefs LinkedIn post surfaced in our search. Semrush computes topic-level AI volume by combining third-party data on real AI interactions with its own models, and says plainly that individual prompts are too specific to measure directly. Both are estimates; both say so; both are more than any dedicated tracker offers.

The shared limit is the same one their own customers name: the index is not your brand. An Ahrefs customer in r/bigseo left for Peec because the data “seemed like rehashed keyword data”; a marketer in r/SEO said Semrush’s score is “based on its own generated prompts”. Both are describing the same design decision, and both vendors sell a prompt tracker for exactly that reason.

05Engines and surfaces

Ahrefs covers more surfaces, and the two it covers that Semrush does not, Claude and YouTube transcripts, are the ones its own customers single out. Semrush’s advantage is the pairing: the same Position Tracking campaign holds Google, Bing or Baidu next to ChatGPT, AI Mode or Gemini, which is the report SEO teams actually ask for.

06MCP, on both, with a catch each

Ahrefs’ pricing page lists an MCP Server among the features included with paid plans. Whether it exposes Brand Radar data or only Site Explorer and Keywords Explorer is not stated. Semrush’s Knowledge Base describes its MCP in detail: read-only, OAuth or API key, an official app in ChatGPT, Claude and Perplexity, 50,000 API units on Semrush One Starter and Pro+ and SEO Classic Pro and Guru, and a data list of keyword, organic and paid, competitive, traffic and backlink data. The AI Visibility Toolkit is not in that list, and the standalone $99 toolkit is not among the plans that include MCP.

So a buyer who wants AI visibility inside Claude or Cursor has the same question for both vendors, and neither page answers it. Ask. For comparison, every Linkeddit capability, including the fix draft and the re-measurement, is an MCP tool over one URL on the $99 plan; the connector page lists them and the playbooks are recorded.

07What their customers say

Neither product has its own review listing; both are rated as suites. Semrush: 4.4 out of 5 on 4,035 G2 reviews on 4 September 2026, listed as an Adobe company. Ahrefs’ suite listing was not fetched for this comparison. The product-specific voice is on Reddit, and it is unusually direct for both.

Ahrefs, from Ahrefs’ own CMO feedback thread in r/bigseo: the index is “a moat” but “not that critical for many brands”; YouTube transcript tracking is “strong, because nobody does it”; “the biggest gap for me is UX/UI. It looks too technical”; one enterprise customer “went with Peec.ai because Ahrefs Brand Radar data seemed like rehashed keyword data”; another stays because Brand Radar “sits on a load of data collected over the years”.

Semrush, from G2 reviews mentioning AI visibility: “we wish it were easier and less costly to add team members”; “they have their AEO abilities and AI searches separate from their main platform, but it goes back to pricing”; “AI features very restricted”. From Reddit: “SEMRush’s visibility tracking is based on its own generated prompts” in r/SEO; “just a simulation of queries and responses” in r/seogrowth; “not 100% convinced by the accuracy” in r/DigitalMarketing; and, in r/aeo, a B2B marketer who demoed both suites and found the prompt databases “heavily skewed toward B2C”.

08Measured: what four AI engines say about Ahrefs and Semrush

This section is ours and labelled as such. On 4 September 2026 we ran our own Answer Radar project for linkeddit.com, 21 approved buying questions about AI visibility and competitive intelligence tools, through ChatGPT, Claude, Gemini and Perplexity via their official APIs with grounded search. Ahrefs and Semrush are not our tracked competitors on that project, so what follows is what the engines volunteered about them. Per engine, admissible samples only, counts stated, per the methodology.

Two more measurements. Across our full population of 220 completed answers about this category, semrush.com was cited twice, once by Gemini and once by ChatGPT, the latter pointing at a Semrush news release about its enterprise AI optimization product rather than at the toolkit; ahrefs.com was cited once, by Perplexity. Engines name Semrush and Ahrefs as brands far more often than they cite either company’s pages. And on the AI citation tracking question, ChatGPT’s fan-out searched for scholarly citation tools, OpenAlex, Semantic Scholar, Scite, before answering, which is a reminder that the phrase “AI citation tracking” is ambiguous to an engine and neither suite owns it.

09Matrix

10Verdict

Pick Ahrefs Brand Radar if you are an Ahrefs customer, if you want the biggest search-derived index and a two-year history, if Claude, Copilot, Reddit-in-Google or YouTube transcripts matter to you, or if you want the cheapest per-check prompt tracking in the category and can accept a technical interface.

Pick Semrush’s AI Visibility Toolkit if you are a Semrush customer, if you want the cheapest first look at any brand’s visibility, if Google-versus-AI in one campaign is the report you will use, or if the AI crawler audit and the free checker are worth having before spending anything.

Pick neither, or add ours, if your buyers ask Claude today, you want a fixed $99 with no per-domain or per-seat multiplier, MCP that carries actions as well as data, and the measurement to end in a fix drafted from what the engines actually read and a re-measurement that says whether it moved. That is Answer Radar, and it has no index; if the index is the point, buy a suite.

11Frequently asked questions