What this is (and isn't)
This overlays standard ad sizes onto common page layouts, shaded by the general attention pattern most eye-tracking research finds for that layout type - readers concentrate attention on the headline and opening content, give secondary attention to sidebars and feature sections, and rarely scroll-engage with footers. It is meant to help you sanity-check ad placement against where attention typically concentrates before you build the actual page.
This is illustrative general guidance, not eye-tracking data from your specific page or audience. Your actual users' behavior can differ meaningfully based on content, design, and intent.
Why this uses general research patterns rather than claiming to predict your specific results
Real eye-tracking and scroll-depth studies consistently find the same broad pattern across many different sites with similar layouts - strong attention near the top and in main content, weaker attention toward footers - but the exact numbers for any one specific site depend on its content, design, and audience intent in ways a generic simulator simply can't capture. Being upfront about that distinction is what keeps this tool useful as a planning aid rather than misleadingly precise.
Why checking ad placement before building the actual page saves real rework
Seeing roughly where attention concentrates on a layout before any content exists lets you sanity-check ad placement decisions early, when moving an ad slot is just editing a mockup - catching an ad placed directly in your highest-value content real estate at this planning stage is far cheaper than discovering a poor placement after the page is built and traffic is already flowing through it.
Why high-attention zones aren't automatically the right place for every ad
An ad placed directly in your most-read content can generate more views, but it can also measurably hurt reading experience and engagement - which is exactly why many publishers deliberately spread some ad placements into secondary zones, trading some potential ad views for a page that readers are more willing to stay on and return to.