Just Piano is a sophisticated sample-based acoustic piano app designed for iPhone, utilizing the advanced GSi WLF Engine to deliver an exceptional playing experience. The app requires users to download one of the high-quality piano sound samples, with options ranging from 1 to 4 GB in size. Users can only install one piano sound at a time, but they have the flexibility to replace it whenever desired. The app features an array of grand piano samples, including options like Grand CFX and Grand D-274, ensuring a rich sound palette for users.

This multimedia application boasts impressive features, such as 128 stereo voice polyphony and authentic string sympathetic resonances, which enhance the realism of the instrument. Additional functionalities include user-defined velocity curves, a built-in semi-parametric equalizer, and stereo reverb effects. With very low CPU and RAM usage, Just Piano serves as both a stand-alone app and an AUv3 plugin, making it a versatile choice for music enthusiasts looking for a high-quality piano experience on their iPhone.