In heart rate variability (HRV) measurement, a Holter monitor is typically used to observe ECG data. However, since this device lacks mobility, any alternative wearable devices with a similar capability of recording cardiac data are preferred. On the other hand, the application provided alongside wearable devices are mostly installed in smartphone environments, which cause significant concern in user's privacy. It is better to develop our application to calculate sensitive data. This study proposed an application that utilizes a commercialized wearable wireless device to collect electrocardiography data and performs an HRV measurement using time domain, frequency domain, and nonlinear domain. Furthermore, it also examines RR interval and ECG data produced by Polar H10. This study is done by prototyping and experimenting involving participants in a laboratory environment. As a result, the proposed application successfully extracts several pieces of information based on HRV measurement. Using T-test shows data RR interval data and ECG data produced by Polar H10 are equal. Thus, RR interval data is suggested for HRV measurement instead of ECG data from the device. Because in ECG data produced by Polar H10 consist of noise especially in early recording. The benefit of using this application is the ability to conducting real-time and continuous measurement cardiac data based on HVR methods.