This app is a fun simulation of 24 different fireworks, with 52 different backgrounds. It'd make a good display for the Fourth of July, or any other occasion.
You can turn each of the fireworks on/off for a gazillion different combinations (actually it's 6.204484017332394e+23, but who's counting). Turn on/off each of the different fireworks by clicking the numbers at the bottom of the screen.
The backgrounds change every 30 seconds, or you can pause on your favorite. You can also go forward or back to find your favorite. You can also turn the explosion sound on/off.
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*** Please note this app is not designed to be super fast, or highly interactive. It's just meant to be a display of simulated fireworks, displayed over some of the most well known cities (and some not so well known ones). The more fireworks that you choose, the slower the display. A good idea is to keep the number of firework selections to about 5-6. Personally our favorite combination is 1,3,4,7,8.