Tone Generator Ultra is a straightforward and user-friendly test tone and frequency generator available for iPhone users. It allows users to set tones by frequency or musical note effortlessly. The program offers a variety of features including sine, square, and sawtooth wave generation, chromatic pitch detection from external sources, configurable A4 calibration, white and pink noise generation, multi-tone generation, impulse wave, and support for frequencies ranging from 20Hz to 22kHz.

Tone Generators serve various purposes such as balancing stereo or home cinema systems, testing speakers, acoustics testing, and white and pink noise generation. Additionally, it can be used alongside PocketRTA Ultra Spectrum Analyzer for iPhone. For entertainment, users can compare their friends' hearing abilities, play pranks by creating pesky sounds, but it is explicitly advised not to use it to annoy teachers.