Ukulele Tuner Pocket - The Ukelele Tuner App - Apps on Google Play
Ukulele Tuning for iPhone or iTouch - UkeTuTu is a free audio-visual tool to quickly tune your Ukulele, powered by Ruben De Anda's popular Ukulele Tuning video
How to Tune an Ukulele: Tuning Tricks & Tips
How to tune a ukulele with an app! - YouTube
How to tune a Ukulele - all methodes Including a Ukulele tuner