Download on the App Store.

WTF Tuner aims to turn the mundane task of tuning your guitar into something a little more fun. Built for iPhone, WTF Tuner uses a simple swarm of particles to visualize the tuning process. Blue particles represent flat, while yellow particles represent sharp. Red particles represent the target pitch and the swarm will converge on the target pitch as you tune your guitar.

The app has 3 modes:

• Free Tuning: Fine tune to any pitch.
• Custom Tunings: Sequentially tune to a series of custom pitches, useful for standard or a set of common alternate tunings.
• Synth Tuning: A mode that allows you to use the app as a simple synthesizer, playing notes by tapping on the screen to generate a reference pitch.