Nautilus is a Y Combinator S25 startup building an AI platform to grow and optimize car washes. Its all-in-one operating system provides CRM, e-commerce, membership management, and automated marketing, replacing legacy systems to help operators increase online sales, reduce churn, and improve retention. The company raised a $500K seed round from Y Combinator in August 2025. Nautilus is based in San Francisco and was founded by two engineers with car-wash industry experience.