Some ad placements send a surprising share of automated or low-quality clicks. If those sessions land in your reports, conversion rates and cost per session look worse than they are, or better if bots fill forms.
tracko.js detects webdriver, headless browsers and automation globals, and bot sessions are excluded from session counts. It also computes a behavioural human score from pointer movement, touches, keystrokes and time to first input on each page leave, kept per session, so you can compare traffic quality across placements.