In this thesis a mobile phone application called “WristMate” is developed as part of environment that consists of a smart bracelet device which reads sensor data, a mobile phone that uses Android OS which connects to the bracelet and mobile phone application. The main goal of the application is the collection of data from the bracelets temperature sensor and forwarding the obtained data to a cloud-based database. The application is the main point of the system and serves as the middle point in the communication. The market for smart bracelet applications already has applications with similar functionalities but they are expensive and have additional functionalities. The aim of development of “WristMate” application is to find a way to introduce to a wider population of users the usage of temperature monitoring. Therefore, it connects to a low-cost smart bracelet with simple and precise functionalities with the focus being taken off unnecessary features to broaden the spectrum of targeted users. The bracelet uses BLE technology as a power efficient, durable, and smart way of communication. BLE devices are being used more and more in today’s market because of their simplicity and wide range of applications, mostly in Internet of Things solutions. The thesis presents the results of research of wrist temperature correlation to body temperature, the testing of the application, analysis of the collected data and possible usage and implementation of the data across scientific fields and day-to-day applications.