Most sites have pages nobody remembers: old campaigns, staging copies, test pages, leftover files. Agents follow links and guess paths, so they reach them. SynthTrail shows every path a flagged session opened.
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A page does not need to be in your menu or sitemap to be reachable. Anything linked somewhere, or sitting at a guessable path, can be read by an agent and quoted later.
Session trails list every path an agent opened. Compare that list with your sitemap and navigation: paths that appear in trails but not in your plan are your shadow pages. Checks also test common leftover paths directly.
SynthTrail does not see Google's index, so it cannot say which pages Google lacks. It shows what agents that run your page actually opened.
Paste one snippet and see the synthetic visitors that use your site. Card details are entered on Stripe, never on this site.