This is THE famous Rave Light app you've seen in clubs worldwide, from San Francisco to Berlin. Ignore the imitators.
Keep your old iphones so you can rave with two hands. If you haven't seen the viral video check it out:
"and THIS will be the reason I get an iphone..." - Reaction on YouTube. This app acts like a magical glow stick, changing colors as you move.
X = Red
Y = Green
Z = Blue
Twist, turn, and flip your iPhone, iPad or iPod Touch to change the colors in Rave Light. Lay the device flat to get blue. Upright to get green. On its side to get red. Shake it fast to flash white.
Cheaper than a pair of glow sticks.