Tuna Pitch is a chromatic tuner and pitch pipe for tuning your musical instrument. It works not only with guitars, bass guitars, cellos, and banjos, but also many other instruments and even with your voice. (Just sing into it!) The tuner works with the built-in microphone on the iPhone, and with any audio that comes in from an external source, such as the microphone on a headset, on the iPhone and iPod touch second generation. The built-in pitch pipe lets you play a reference tone for tuning by ear.

Tune-O-Rama is a fully-automatic musical tuner for the iPhone. It features two tuners in one package: chromatic and automatic. The chromatic module performs intelligent pitch/tone detection in the range ~20-1250 Hz, suitable for use with a wide variety of instruments. On the other hand, the automatic module is specially designed for the guitar and bass, and features intelligent string prediction as well as 20 alternate tunings.

PitchBot is a chromatic tuner designed with string instruments in mind. PitchBot's tuning prowess is in its custom-made algorithms to capture, measure and interpret audio data. Whether you use it as a guitar tuner, a mandolin tuner or a cello tuner, PitchBot delivers quick and accurate readings, even in the noisiest environments.

ProTempo is the quintessential digital metronome for iPhone brought to you by Planet Waves, one of the D'Addario company's family of world-renowned musical instrument accessory brands. Whether you're practicing, composing or recording, the ProTempo metronome app delivers unmatched utility and convenience for musicians at all levels.

Tempo Advance is not designed as a app to ape a physical digital metronome. It was designed with the iPhone' display size and multi-touch in mind. A large "virtual LEDs" display takes center stage, surrounded by controls for more freqently-used functions. Advanced options are accessible via five modal panels that appear when certain buttons are held.

Meters are represented as simply the number of beats per measure, and the number of divisions per beat. Coupled with the ability to customize every beat and sub-beat, this gives you maximum flexibity in defining the time signature you want.

Auto setlist advancement, accelerando, ritardando and bar tracking makes it possible for you to program count-ins or complex songs with varying tempo, time signatures and rhythms.

Subdivide is the most accurate, feature-filled metronome available on the App Store. Loud, clear, precise, and flexible. If you have ever used a Dr. Beat metronome, you'll feel right at home with Subdivide. Drag the sliders up and down to display different subdivisions. Switching tempos is a snap. Save an unlimited number of presets for quick access.