Byerrm is a lifestyle app available for iPhone that allows users to play an MLG Air Horn by holding down a button. The app offers customization options for the horn's pitch and duration through sliders, even while the horn is playing. Users can tap the button multiple times for a unique "Byer-byer-byer-byerrm" effect.

Byerrm does not feature any ads and does not collect user data, except for local statistics for user enjoyment. The app introduces an "AR Horn" mode, which places a 3D airhorn in the user's environment. Additionally, Apple Watch support enables users to access the Byerrm button directly on their wrist, with a convenient complication for easy use.