Frequency Sound Generator is an app used to produce sounds at varying frequencies. Useful for tuning audio equipment, testing hearing or simply annoying friends, the free app offers a wide range of settings to play around with and a decent selection of presets. While the free version does have a number of ads, they are generally limited and can be removed with a purchase. Overall, Frequency Sound Generator does a solid job for a few particular occasions but lacks some advanced features that a professional may require.