TestHiFi by TestHiFi GmbH is a free Android application that measures the output quality of an audio system. It is a useful tool for audiophiles who want to test their own, their friend's, or any other system to know if it is capable of handling good quality music. TestHiFi is also beneficial for salespersons who want to give testimony to a customer on the quality of the product, online stores that provide the test result as an evaluation of the products they sell to potential customers, and marketing companies that offer users who have just conducted a test a cheaper and better product.

The app's measurement method is not influenced by brand names or other subjective factors, making it a reliable tool for measuring the output based on a given test signal. It provides a three-stage result (red, amber, green) that can address most of the users' needs. The app is easy to use, and further in-app purchases provide details on the measurement result, enable measurements to be stored and shared on social media. However, please note that even after sensitivity calibration, there may be deviations compared to laboratory-grade equipment due to the variation in microphones and their operating conditions in mobile devices.