Term
Visibility Index
Aggregated visibility score for a domain in the Google index, computed by SEO suites (Sistrix, Searchmetrics, Semrush) from their own crawls — useful for trend comparison, but not a Google signal.
Visibility Index — explained in more detail
The visibility index (best known via Sistrix) is a proprietary score computed from a fixed keyword set, the respective ranking position, and an estimated CTR factor. A higher position for a high-volume keyword → larger contribution to the index. Methodology differs by provider (Sistrix VI, Searchmetrics SEO Visibility, Semrush Visibility Index are not directly comparable).
Important to understand: the visibility index is not a value from Google — Google itself doesn’t know this number. It’s an external estimation model. Its value lies in trend comparison: how does my domain’s visibility change over time, relative to competitors, before and after algorithm updates? Absolute values across domains are less meaningful than the trajectory.
Example / In practice
A sharp Sistrix VI drop of 30 % from one day to the next is a strong indicator of an algorithm update — even before Google has officially announced anything. The Sistrix Toolbox visualizes update timestamps along the curve, which simplifies diagnosis and recovery planning.
Distinction from similar terms
Domain Rating / Domain Authority measures backlink strength, not ranking visibility. Google Search Console shows your own authoritative click and impression data. The Sistrix Visibility Index is the dominant variant of the visibility index in the DACH region.
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