Relixir

Relixir (YC X25) builds autonomous GEO (Generative Engine Optimization) software to help companies rank higher in AI-powered search results. Its Rex agent monitors AI visibility across all major LLMs, generates and publishes optimized content, and builds domain authority 24/7. Founded by Sean Dorje and Dennis Zax, Relixir raised a $2M seed round led by Y Combinator and Z21 Ventures.