Additionally, paper-based sensors have become popular in applications such as clinical, food, and environmental sectors, where practical and simple analytical devices are needed for portable and on-site real-time detection. There is a growing demand for point-of-care (POC) diagnostics that can provide quick test results, a challenge that paper-based sensors could potentially meet. This review will introduce commonly used paper-based for electrical sensing, existing fabrication and analysis techniques, and various application areas for these heavy meal ion sensors. It will also highlight the challenges that need to be addressed for paper-based sensors to reach their full potential, along with future outlooks.