Perplexity
Perplexity is a search-native answer engine. Its overall share of assistant usage is smaller than ChatGPT or Gemini, but nearly all of that usage is cited answer queries - exactly the behaviour AI visibility cares about. It is also among the assistants most likely to send measurable referral traffic.
Silktide measures Perplexity by asking it the same prompts you configure for AI visibility tracking, then recording the answer, which brands it mentions, and which sources it cites.