How Perplexity’s Citation Algorithm Differs From ChatGPT’s for UK Queries
ChatGPT and Perplexity share only about 11% of cited domains. Three levers, retrieval, recency and source-type, explain why the same UK query returns different sources.
Brand Mention Frequency vs Citation Frequency: The 2026 AI Search Divergence
Mentions and citations are different events in AI search, and in 2026 they diverged. Semrush found 62% of AI citations never name the brand. The gap tells you what to fix.
Citation Half-Life by Industry: How Fast UK Law, Healthcare and SaaS Citations Decay
Citation half-life measures how long a page holds its AI citation share before it halves. It differs by industry: regulated UK verticals hold longer, SaaS decays fastest.
ROI Accountability: 5 KPI Clauses to Write Into an AI SEO Contract, With a Refund Trigger
Most AI SEO contracts pay for activity, not outcomes. These five KPI clauses, plus a refund-trigger template, tie the fee to citation share, freshness and schema coverage.
The 3-Layer Content Brief: Writing for Google Rank and AI Citation at Once
A single content brief can optimise for Google ranking, AI retrieval and AI citation at the same time. Here is the three-layer template, with the checklist for each layer.
GEO Services Pricing in 2026: 3 Models Compared, from Retainer to Outcome-Based
Retainer, project and outcome-based pricing each suit a different GEO engagement. Here is how the three models work, what they cost to run, and when each one fits.
AEO vs GEO: The 2026 Distinction, the Convergence, and Why Agencies Still Mis-Sell It
Answer engine optimisation and generative engine optimisation began as different disciplines and have converged. Here is the real distinction in 2026 and how to spot a mis-sell.
Perplexity vs ChatGPT: Why They Cite Different Sources, and 2 Publishing Playbooks
Perplexity leans on primary and news sources; ChatGPT leans on Wikipedia and reference sites. Here is what the published data shows and two publishing playbooks that follow from it.
The AI Visibility Audit Methodology: A 10-Step Framework Any Agency Can Copy
A repeatable 10-step method for auditing how visible a site is across ChatGPT, Perplexity and Gemini, with a query template, a scoring rubric and a worked scorecard.
The AI SEO Consultant Case-File Template: 6 Proof Points Every Credible Report Must Show
Most AI SEO case studies prove nothing. This template sets out the six proof points a credible case file must contain, from baseline data to an attribution method.