Blog

Since 2003 our blog been the central library for SEO news, professional data analysis and expert opinion on the current trends in the platform economy.

May 2026 Core Update: Visibility Analysis and Data Updates

The May 2026 Core Update was announced on 21st May 2026, following the March Core Update. It is currently rolling out and is expected to take two weeks to complete. Data, analysis, examples and rankings for affected domains are shown below in this article.

Steve Paine

26.05.2026

Ocado vs M&S – Food fight!

Marks and Spencer, UK fashion and food chain, are beating their business partner Ocado at creating search visibility for the same food products. M&S aren’t selling those products but it feels like that could be the next step. Is this additive, or will it cannibalise? Is it an indicator that […]

Steve Paine

19.05.2026

AI Citation drift: How stable are sources in AI search results?

A source cited in an AI response today may well have disappeared by next week. Our analysis of 82,619 prompts over 17 weeks shows that Google replaces 56% of sources in AI-generated responses every week, whilst ChatGPT replaces as much as 74%. In this article, we will explain who stays, […]

Johannes Beus

01.05.2026

Prompt Research: Keyword Research for AI Search

Keyword research no longer works in AI Search. Prompt Research solves this with a new level of abstraction: topics instead of keywords, based on over 62 million real user questions.

Johannes Beus

17.04.2026

The Search Leaders for International Flights, and how they appear across Chatbots

The monthly SectorWatch series returned to travel this month. In this additional analysis I take data from that report and extend it across chatbots to find the leaders and similarities. I also look at AI Overviews exposure.

Steve Paine

16.04.2026

The Best of – SISTRIX Blog

These articles from the last year are exceptional. They helped people, nurtured discussion and spurred thoughts. Here’s our hand-picked selection of the best of SISTRIX Blog.