Noise Canceller is a free app available for Android devices that aims to reduce environmental noise by generating a phase-inverted wave of the noise. The app requires the user to manually adjust the phase and amplitude to achieve the best effect due to the delay of sampling and playing, as there is no real-time sound API available on Android.

The app is developed by Haowen Ning and falls under the category of Utilities & Tools. The latest version, 1.0.2, fixes some force close bugs. Overall, Noise Canceller is a useful tool for anyone looking to reduce background noise in their environment.