Lucis (YC P25)

Lucis is a Paris-based preventive healthcare startup founded in 2025, backed by Y Combinator.

The company focuses on enhancing human longevity by providing AI-driven health insights across Europe. Lucis operates as an educational and preventive health companion, bridging clinical-grade laboratory data with actionable lifestyle advice. Its mission is to make preventive health the standard for individuals in Europe. The core offering is a subscription-based preventive health companion app that integrates clinical testing with AI analysis and personalized health planning. Users can access a wide range of blood biomarker analyses, receive tailored health action plans, and benefit from ongoing health tracking. Lucis has already served over 10,000 customers and conducted more than 1 million biomarker tests, demonstrating significant early traction in markets including France, the United Kingdom, Ireland, and Portugal. The company aims to empower individuals to take proactive steps toward their health and well-being.