Retro Biosciences vs Karius
Side-by-side comparison of AI visibility scores, market position, and capabilities
Largest-funded pure-play longevity startup raising $1B Series A at $5B valuation; Sam Altman-backed; pursuing cellular reprogramming, autophagy, and plasma factor therapeutics in parallel; first human trial targeting Australia launch.
About
Retro Biosciences is the largest-funded pure-play longevity company in history, raising $1 billion in Series A financing at a $5 billion valuation with Sam Altman (OpenAI CEO) as a primary backer. The company is pursuing cellular reprogramming, autophagy enhancement, and plasma factor therapeutics in parallel — a multi-pronged approach to extending healthy human lifespan by targeting the cellular hallmarks of aging simultaneously.
Karius raised $409M total including a $100M Series C in May 2024; its genomic blood test detects 1,000+ pathogens at 400+ U.S. hospitals; launched Karius Focus BAL for pneumonia in April 2025.
About
Karius is a Redwood City, CA-based life sciences company founded in 2014 that developed the Karius Test — a single blood draw that uses next-generation sequencing and AI to detect over 1,000 pathogens (bacteria, fungi, viruses, parasites) in seriously ill patients. The test is used when conventional cultures and targeted diagnostics fail, providing clinicians at transplant centers, children''s hospitals, and ICUs with a comprehensive pathogen report within 24 hours.
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