Indolin-4-ol is primarily utilized in the synthesis of various pharmaceuticals, particularly in the development of compounds with potential therapeutic effects. It serves as a key intermediate in the production of drugs targeting neurological disorders, such as Parkinson's disease, due to its structural similarity to certain neurotransmitters. Additionally, it is employed in the creation of anti-cancer agents, where its derivatives are studied for their ability to inhibit tumor growth. The compound is also explored in the field of organic chemistry for the development of novel materials and catalysts, owing to its versatile reactivity and functional group compatibility.