Please note: On Android Oreo and higher (especially Samsung) you may experience crashes due to background execution limits. The bug fix in 2-1 was not enough.

Skewy will mask your conversation making the picked up by the microphone unusable (like a jammer). Giving someone who wants to use this data a very difficult task. Optional alarming and fine tuning with live graphs maximize effectiveness.

Ultrasonic signals signals are used by advertisement/tracking companies such as SilverPush to access your phone without you noticing*. Skewy can detect ultrasonic signals notify you and even jam ultrasonic signals.

It works most elegant with a a small speaker to focus the sound on the phone's microphone making it silent its surroundings. Ideas how to make
a tiny speaker are found in the help section.

With live graphs and live sensitivity adjustments Skewy can be used to locate ultrasonic frequency sources. This can range from an ultrasonic beacon to electronic equipment.

*Reference: Arp et al. 2017: Privacy Threats through Ultrasonic side Channels on Mobile Devices TU Braunschweig.

Intro images: Francisconimo