Twice a year, SISTRIX pulls back from its monthly cadence and looks at the full shape of Germany's search landscape. The exercise pays off when a shift this size shows up: in the company's latest Top 100 Domains review, published today as part of its June 2026 monthly newsletter, YouTube has overtaken Amazon to claim second place among Germany's most visible websites, a position Amazon has held for an extended stretch.

The figures attached to that shift are specific. According to SISTRIX, Amazon lost 607 Visibility Index points in the period covered by the report, a 20 percent decline. The company frames this not as a single bad month but as a trend that has built across several consecutive Google updates - the kind of pattern that only becomes visible when data is reviewed across a half-year window rather than a monthly one.

Bonn-based SISTRIX, founded and led by Johannes Beus, has tracked its Visibility Index for eighteen years, making it one of the longer-running measurement instruments in German search analytics. The newsletter carrying today's domain rankings also includes two further pieces of SISTRIX's own data: a pattern analysis from the recently completed May 2026 Google core update, and the launch of AI Deep Dives, a new analysis feature built on the company's own search and AI-citation data.

Idealo, streaming, and Reddit climb; retail and language tools fall

Beyond the headline shift at the top of the rankings, several other movements stood out in the data SISTRIX presented. Idealo posted the largest gain in the middle of the table, adding 366 Visibility Index points - a 75 percent increase - and rising from ninth position to sixth. That kind of jump, in a ranking system built from aggregated keyword performance across the entire German web, represents a substantial and rapid shift in how often the comparison-shopping site appears in search results.

Streaming services gained as a group. According to SISTRIX, Spotify rose 48 percent and Apple climbed 83 percent, while Netflix entered the top 100 German domains for the first time. Reddit also reached a new milestone, climbing into the top ten domains in Germany for the first time, taking ninth position with a 35 percent gain - the latest step in a longer rise the platform has made through SISTRIX's German visibility rankings over the preceding year.

Retail domains moved in the opposite direction. SISTRIX recorded a 34 percent decline for Zalando, a 24 percent decline for Mediamarkt, and a 13 percent decline for Ikea. According to the company, these three losses clustered around similar points in time, which SISTRIX suggests may indicate that Google is evaluating retailers collectively as a category rather than responding to circumstances specific to any one domain. Two language-tool domains, DeepL and dict.cc, dropped out of the top 100 entirely - a movement SISTRIX connects to losses the broader language-tools category had already begun absorbing during March's core update.

SISTRIX's full analysis of the Top 100 Domains data, authored by SEO expert Nina Roser, examines what the streaming sector's gains and the retail sector's losses might have in common, and how the movements fit the pattern of recent core updates. The newsletter directs readers to the complete report for that underlying reasoning rather than summarizing it in full.

May's core update: comparison content loses, product directories win

SISTRIX's newsletter also carries the company's own analysis of the May 2026 Google core update, which the newsletter confirms had completed its rollout by June 2. According to SISTRIX, the completed cycle produced two consistent patterns in the company's German visibility data: generic comparison and financial-service content lost ground broadly, while brands maintaining genuine product directories gained it.

The newsletter frames the deciding factor in SISTRIX's data not as a matter of content format, but of whether a given page sits in close thematic alignment with a clearly defined core offering - a brand selling a specific, identifiable category of product, as distinct from a site aggregating listings across many unrelated categories. That distinction echoes the broader story the Top 100 Domains data tells about Idealo's gain set against the retail sector's losses: a comparison and aggregation site climbing while several direct retailers fall, within the same data window.

AI Deep Dives brings interpretation inside SISTRIX's own data

The newsletter's third major piece of SISTRIX-original material is a product launch. According to SISTRIX, the company has introduced AI Deep Dives, a set of analyses that combine AI-driven interpretation with SISTRIX's own deterministically calculated data, delivered inside the SISTRIX interface itself.

The company's stated reasoning for that architecture is specific. According to SISTRIX, AI systems are competent at reading and interpreting large datasets, but they cannot reliably perform arithmetic, they tend to invent facts when working from a thin evidentiary base, and they struggle to separate well-sourced expertise from confidently stated but unreliable claims, because both can sound equally plausible in generated text. AI Deep Dives is built to route around that weakness: the AI component interprets and writes, while the underlying numbers, calculated metrics, and SEO and GEO knowledge originate entirely from SISTRIX's own verified systems.

Eleven Deep Dives are available at launch, distributed across two existing SISTRIX tools. Within AI Check - where a user enters a domain or brand and sees how it is mentioned or cited across AI-generated answers - the new Deep Dives cover brand perception, factual consistency across different AI platforms, the topics and roles in which a brand gets mentioned outside branded searches, and the share of citations drawn from a brand's own properties. Within Prompt Research, four further Deep Dives address content opportunities derived from genuine search demand, unspoken audience concerns not yet addressed in existing content, a platform-by-platform breakdown of how user questions differ across ChatGPT, Perplexity, and AI Overviews, and the distinct buyer types behind a given set of queries.

The Deep Dives are available free to all users within the SISTRIX for AI/Chatbots beta and export directly as Markdown or PDF files, distinguished in the product's filter bar by a violet color set apart from SISTRIX's standard filter buttons. The company indicated that a detailed tutorial covering specific use cases will follow; further technical detail is available in SISTRIX's own changelog for now.

The launch builds on infrastructure SISTRIX had already put in place. The company opened its existing MCP server to every subscription tier in May 2026, introducing OAuth-based authentication that let any SISTRIX customer connect the platform to external AI assistants such as Claude and ChatGPT without an API key. That server allowed external AI systems to query SISTRIX data directly, but the interpretation step still happened outside SISTRIX, inside whatever chatbot interface a user was running at the time. AI Deep Dives represents a different architectural choice: rather than exporting SISTRIX data out to a third-party AI system, the company has brought a constrained interpretation layer inside its own product, where it retains direct control over what data a model is permitted to see and reason over.

Why this matters for the marketing community

Read together, SISTRIX's three pieces of data this month describe a company tightening its own grip on data quality at the same moment its measurements are documenting a search landscape in flux. The Top 100 Domains shift puts a precise number on a structural change at the very top of the German rankings - Amazon's 20 percent decline is not a marginal fluctuation, and YouTube's move into second place changes the reference points search professionals use when benchmarking visibility. The May core update analysis gives marketers a concrete signal to act on: product-directory depth appears to outperform comparison-style aggregation in the current ranking environment, a pattern visible in the same domain data showing Idealo's rise alongside Zalando, Mediamarkt, and Ikea's declines.

The AI Deep Dives launch addresses a different but related concern. As SEO and content strategy increasingly depend on understanding how AI systems cite, describe, and rank brands, the reliability of the tools used to measure that behavior becomes its own variable. SISTRIX's architecture for AI Deep Dives - AI for interpretation, SISTRIX's own systems for the underlying numbers - is the company's answer to a problem that affects any organization relying on AI-generated analysis: a model that invents a figure rather than retrieving one is not always immediately distinguishable from one reporting an accurate measurement, particularly when both are phrased with equal confidence.

Timeline

  • May 21, 2026 - Google's May 2026 core update begins its rollout
  • June 2, 2026 - The May 2026 core update completes
  • Today (June 30, 2026) - SISTRIX publishes its June 2026 monthly newsletter, presenting its semi-annual Top 100 Domains report, its analysis of the completed May 2026 core update, and the launch of AI Deep Dives

Summary

Who: SISTRIX, the Bonn-based SEO analytics company founded and led by Johannes Beus, published the data in its June 2026 monthly newsletter.

What: SISTRIX's semi-annual Top 100 Domains report found YouTube overtaking Amazon for second place among Germany's most visible domains, with Amazon down 20 percent. The same newsletter presented SISTRIX's analysis of the completed May 2026 Google core update, identifying gains for product-directory content and losses for generic comparison and financial-service content, and announced the launch of AI Deep Dives, a new feature combining AI interpretation with SISTRIX's own verified data.

When: SISTRIX published the newsletter today, June 30, 2026. The May 2026 core update referenced in the analysis ran from May 21 to June 2, 2026.

Where: The Top 100 Domains data and core update analysis cover the German search market specifically. AI Deep Dives is available globally to SISTRIX subscribers through the company's AI/Chatbots beta.

Why: The data matters because it quantifies, with specific figures, a structural shift at the top of German search visibility and gives marketers a concrete pattern - product-directory depth over aggregation - to weigh against the most recent core update. The AI Deep Dives launch addresses a parallel concern: as AI-assisted analysis becomes more central to SEO workflows, the reliability of the underlying data those tools draw from becomes a competitive differentiator in its own right.