CS Customizer is an iPhone app developed by Conversion Sound Inc. It is designed for users of Sound World Solutions' CS50/CS50+ Bluetooth Series personal sound amplifier, Companion, or Sidekick products. The app enables users to personalize their settings and control the device via Bluetooth link from their smartphone.

The app features a "Personalize" tab that guides users through tailoring the performance of the listening device to their individual preferences. Users can adjust baseline settings to preset listening profiles or create their own. The "Settings" tab offers environmental settings such as Restaurant Setting for noisy environments and Entertainment Setting for musical events. Additionally, an "Equalizer" tab allows users to customize treble, mid, and bass frequencies for a personalized audio experience.