scroll-depth-analyzer

Scroll Depth Analyzer

Measure how far users scroll on your pages — where they stop, what they see, and whether your key content is actually being viewed.

When to Use

• "Are users scrolling past the fold on the landing page?"
• "Do users reach the CTA at the bottom of the pricing page?"
• "Where do users stop reading on the blog post?"
• "Is the important content on /features actually being seen?"
• "Compare scroll depth between new and returning visitors"
• "Did the new page layout improve scroll depth?"

Mental Model

Users don't read every word. They scan and scroll. The question is: do they scroll far enough to see the important stuff?

Scroll depth is measured in percentage of the page:

• 25% — User saw the hero/header
• 50% — User saw the first section of content
• 75% — User saw most of the page
• 100% — User reached the footer

The "fold" (visible area without scrolling) varies by device — it's roughly 600-800px on desktop, 500-600px on mobile. Content above the fold gets nearly 100% visibility. Content at 75% scroll depth might only be seen by 30% of users.

Workflow

Step 1: Choose the page

Which page does the user want to analyze? Typically:

• Landing pages (are users reading the pitch?)
• Pricing pages (do users see all tiers?)
• Blog posts (are users reading to the end?)
• Product pages (are users seeing the specs?)
• Checkout pages (are users seeing the full form?)

Step 2: Build scroll depth metrics

Fullstory doesn't have a native scroll depth metric, so build it from page view and time-spent data:

fullstory:build_metric(
  query="users who viewed /pricing",
  output_type="single_number"
) → total visitors

fullstory:build_metric(
  query="users who spent >30 seconds on /pricing",
  output_type="single_number"
) → engaged visitors (read beyond the fold)

fullstory:build_metric(
  query="users who spent >60 seconds on /pricing",
  output_type="single_number"
) → deep readers (read most of the page)

Time on page is a proxy for scroll depth — longer time = more scrolling.