The article provides a comprehensive review of the sensing utilities of cesium lead halide perovskites (CsPbX3; X = Cl, Br, and I) and their composites in various applications. These materials have gained significant interest due to their exceptional optoelectronic properties, including structural stability, luminescence, and electrical properties, which make them suitable for developing optical and photonic devices. CsPbX3 and composites exhibit stable sensing utilities when exposed to light, heat, and water, and have been widely used for detecting a wide range of analytes, such as metal ions, anions, chemicals, explosives, bioanalytes, pesticides, fungicides, cellular imaging, volatile organic compounds (VOCs), toxic gases, humidity, temperature, radiation, and photodetection. The review covers the synthetic pathways, design requirements, advantages, limitations, and future directions of CsPbX3 and composites. It highlights the importance of structural stability and optoelectronic properties in sensor applications, emphasizing the role of these properties in the detection mechanisms. The article also discusses the detection of metal ions, anions, chemicals, explosives, and other analytes using CsPbX3 and composites, providing detailed examples and experimental results. Key findings include the high selectivity and sensitivity of CsPbX3 and composites in detecting specific analytes, the effectiveness of surface stabilization techniques in enhancing their stability, and the potential for real-time applications in various environments. However, the review also points out challenges such as the need for further investigations into the underlying mechanisms, the reliability of sensors in aquatic environments, and the optimization of composition concentrations to improve performance. Overall, the article serves as a valuable resource for researchers and practitioners interested in the sensing applications of CsPbX3 and composites, providing a detailed overview of their capabilities and limitations.The article provides a comprehensive review of the sensing utilities of cesium lead halide perovskites (CsPbX3; X = Cl, Br, and I) and their composites in various applications. These materials have gained significant interest due to their exceptional optoelectronic properties, including structural stability, luminescence, and electrical properties, which make them suitable for developing optical and photonic devices. CsPbX3 and composites exhibit stable sensing utilities when exposed to light, heat, and water, and have been widely used for detecting a wide range of analytes, such as metal ions, anions, chemicals, explosives, bioanalytes, pesticides, fungicides, cellular imaging, volatile organic compounds (VOCs), toxic gases, humidity, temperature, radiation, and photodetection. The review covers the synthetic pathways, design requirements, advantages, limitations, and future directions of CsPbX3 and composites. It highlights the importance of structural stability and optoelectronic properties in sensor applications, emphasizing the role of these properties in the detection mechanisms. The article also discusses the detection of metal ions, anions, chemicals, explosives, and other analytes using CsPbX3 and composites, providing detailed examples and experimental results. Key findings include the high selectivity and sensitivity of CsPbX3 and composites in detecting specific analytes, the effectiveness of surface stabilization techniques in enhancing their stability, and the potential for real-time applications in various environments. However, the review also points out challenges such as the need for further investigations into the underlying mechanisms, the reliability of sensors in aquatic environments, and the optimization of composition concentrations to improve performance. Overall, the article serves as a valuable resource for researchers and practitioners interested in the sensing applications of CsPbX3 and composites, providing a detailed overview of their capabilities and limitations.