The answer engines that matter most are ChatGPT, Google AI Overviews and AI Mode, Gemini, Perplexity and Microsoft Copilot. Which ones deserve your attention depends on where your buyers search. Google's AI features reach the largest audience because they sit on top of regular search, while ChatGPT is the most used standalone assistant.
"AEO platforms" can also mean the software used to track visibility in those engines. That category includes Profound, Peec AI, the Semrush AI Visibility Toolkit and Ahrefs Brand Radar, among others. These tools run prompts on a schedule and report mentions, citations and competitor share. Engine coverage and pricing vary, so match them to the engines your market uses.
EliteAEO keeps a directory of 30 AI visibility tools with the engines each one tracks and its public starting price where disclosed.