isfizz is a SFZ file player designed for iPhone users. It allows users to load SFZ files and play sampled sound instruments. Key features include the ability to edit SFZ strings directly within the app, loading SFZ files without the need to copy them, and utilizing a double tap to enter values and a triple tap to reset. Additionally, isfizz supports Scala tuning files (.scl), MIDI, and up to 16 outputs using the "output=N" opcode in SFZ.

This app supports a variety of sample file formats including .wav, .aiff, .mp3, .flac, .ogg, and .wv. With the inclusion of an Audio Unit Extension (AUv3), users can enhance their music creation experience on their iOS devices. isfizz is an iPhone/iPad port of the sfizz-ui project, incorporating codes and images from the original project while also contributing a portion of its income to the SFZ Tools team.