Application‑based segmentation of the Single Organ-on-a-Chip Models market isolates four principal use cases that together drive demand. Drug discovery dominates with an estimated 45 % share, as pharmaceutical firms integrate organ‑specific chips to de‑risk lead optimization, generate early ADME data, and replace high‑cost animal studies. Toxicology testing follows at roughly 30 %, where regulatory agencies encourage in‑vitro safety assessments for hepatotoxicity, cardiotoxicity, and nephrotoxicity, prompting widespread adoption across chemical and cosmetic sectors. Disease modeling accounts for about 15 % of market value; researchers employ organ‑specific platforms to recapitulate pathophysiological mechanisms of diabetes, fibrosis, or neurodegeneration, enabling mechanistic insights and biomarker discovery. Personalized medicine, though the smallest segment at ~10 %, is gaining traction through patient‑derived induced pluripotent stem cell (iPSC) chips that allow individualized drug response profiling. The relative weight of each application reflects its contribution to overall market size, with higher‑value drug‑discovery and toxicology projects commanding larger R&D budgets and thus a greater share of the Single Organ-on-a-Chip Models segmentation.