Data and research

Studies

• AI Visibility Leaderboard

  Semrush AI Visibility Toolkit (129) and Profound (128) were named most by Perplexity and ChatGPT in 266 answers about AI-visibility tools in October 2026.

  Latest: October 2026 · checked 12 October 2026

  Read the studyTools (CSV)Domains (CSV)Method

• What AI answers cite

  In October 2026, Perplexity and ChatGPT answers about AI visibility cited hubspot.com more than any other site: 21% of the 140 answers that listed sources.

  Latest: October 2026 · checked 23 October 2026

  Read the studySites (CSV)Kinds of site (CSV)Method

• Who Published a Price? The 13 August 2026 CitedIndex Study

  Historical pricing records: 59 of 68 readable software records include a currency price; 6 of 11 readable service records use quote pricing. Dated 13 August 2026.

  Statistics · 13 August 2026 · 8 min read

• Which AI-Visibility Tools Show Their Work? A Methodology Census

  A dated 74-tool transparency review: six had inspectable supporting material, not independently validated accuracy. Corrected evidence scope and sampling units.

  Statistics · 7 August 2026 · 22 min read

• Free-Access Census: Corrections to the August 2026 Findings

  The August 2026 free-access census is corrected, not remeasured: recurring allowances, signup grants and plan-specific trials must be distinguished.

  Data report · 5 August 2026 · 10 min read

• Which AI-Visibility Tools Can Your Own AI Agent Actually Query?

  A corrected MCP access report: historical totals withdrawn, vendor research preserved, and API, server, tier and read-only distinctions explained.

  Statistics · 24 July 2026 · 15 min read

• AI Search Statistics 2026: The Data Behind the Shift

  Dated AI-search studies and enterprise survey findings, with corrected source attribution, study windows, denominators and limits on causal claims.

  Statistics · 21 July 2026 · 8 min read

• Who's Backing Your GEO Stack? The 2025-2026 Money Wave

  Ten dated GEO financing and acquisition events through July 2026, separating disclosed terms and company plans from unsupported pricing and survival predictions.

  Market analysis · 21 July 2026 · 12 min read

• How AI answer engines cite sources: what the studies show

  What Profound, Otterly and Ahrefs citation studies actually measure, where their samples and denominators differ, and what they do not prove about AI source selection.

  Report · 16 July 2026 · 8 min read

• The 20 August 2026 GEO Tool Landscape: Historical Tags, Pricing and Limits

  A preserved 79-tool directory edition with recovered historical engine tags, corrected trial range, and explicit pricing, API and evidence limits.

  Market analysis · 12 July 2026 · 16 min read