Nightwatch started as a traditional SEO rank tracker but has expanded into AI visibility tracking, monitoring whether a brand's content gets cited in ChatGPT, Claude, Gemini, and Perplexity answers alongside traditional Google rankings. Its differentiator is linking the two data sets, showing which ranking changes correlate with gained or lost AI citations. Aimed at SEO teams and agencies that need to prove impact beyond traditional SERP position as AI search grows.