There are two places to spot an automated visitor: at your server, or inside the page. They see different things, and each has blind spots.
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Server logs and edge tools see every request, including crawlers that never run scripts. They know addresses, headers and timing. They cannot see what happened inside the page, such as clicks, typing or scroll.
A snippet sees only visitors that run your page, but it sees a great deal: automation markers, scripted input, form submits and the whole trail of actions. SynthTrail works this way.
Server tools answer how much automated traffic hits you. A client-side trail answers what the browser-driven part actually did. Since SynthTrail reports and does not block, it sits beside whatever server-side protection you use.
Paste one snippet and see the synthetic visitors that use your site. Card details are entered on Stripe, never on this site.