Citadex is the world’s first full-stack AEO (Answer Engine Optimization) and GEO (Generative Engine Optimization) platform, founded in 2025 by Leo (Lijun) Sun. We help brands monitor, analyze, and optimize their visibility across ChatGPT, Claude, Gemini, Perplexity, Copilot, Grok, DeepSeek, Mistral, Qwen and Google AI Overviews/Mode.
When your customers ask an AI which brand to choose — is yours the answer? Citadex exists to make sure it is.
Search used to be about links and rankings. Today hundreds of millions of people skip Google entirely and ask AI directly. ChatGPT, Claude, Gemini, Perplexity, Grok, Copilot, DeepSeek — and more than 20 AI platforms in total — are becoming the new front page. They decide which brands get recommended, which get ignored, and which get described wrong.
Traditional SEO tools were built for a world that no longer exists. They track keyword rankings, backlinks, and page speed — but none of them can tell you whether an AI will cite your brand tomorrow morning, or why it recommended a competitor instead.
Citadex was built to close that gap. We’re the world’s first full-stack AEO platform — designed from the ground up to help brands monitor, understand, and improve how AI talks about them across every major engine and language.
Every part of the AEO loop — monitoring, diagnosis, content, and proof — lives in one place, so you never stitch answers together across tools.
Track your brand's mention rate, rank, sentiment, and citations across all 11 AI engines — in real time.
See exactly why an AI recommends a rival instead of you — prompt by prompt — and win the answer back.
Trace the exact sources AI pulls from — Wikipedia, Reddit, news, your own docs — so you know what to influence.
Generate answer-ready, AEO-optimized content, built to be quoted — from a full research-to-draft pipeline.
Set it once and Citadex runs the whole loop for you: researching, drafting, optimizing, and publishing on a schedule.
A team of specialized agents — researcher, strategist, writer, editor, SEO — does the heavy lifting behind every asset.
20+ free AEO tools: citability checker, schema & llms.txt generators, Reddit / Quora / LinkedIn finders, and more.
Push approved content live in one click to 10+ channels — CMS, blog, and social — straight from Citadex.
Track and optimize across 11 engines and 9 languages, so you win the answer in every market you sell in.
“I started Citadex the moment I realized my own buying decisions were being made by an AI, not a search page. When you ask ChatGPT or Perplexity for the best option in a category, two or three brands get named — and everyone else disappears.
That single shift decides who grows and who fades over the next decade. Citadex exists so any brand — not just the ones with the biggest budgets — can see how AI describes them, understand why, and earn their place inside the answer.”
We believe every brand deserves to control its own narrative — not just in search results, but in AI answers. The brands that establish their presence in AI systems today will hold an advantage that’s hard to reverse tomorrow.
AI’s training data has inertia. Once a model learns to associate your brand with expertise and authority, it becomes genuinely difficult for competitors to displace you. Our mission is to help brands earn that position — and keep it.
Whether you have a question about the platform, want to explore a partnership, or just want to talk AEO — reach out anytime.
Start tracking your brand across 11 AI engines, in any language, today. Be the authoritative answer — not a footnote.
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