An old app I've had for years, is still around. Fireworks Arcade, by Big Duck Games. Now, I believe it did have games in it, but just watch the show. Quite realistic, with real recorded explosions to go along with it, including the resounding echoes. There are over 250 fireworks apps, and there are probably many just as good, but this has tricks. Besides watching the show, tap the screen. Run your finger down the screen. Top notch effects, mesmerizing on our screens, and it's FREE.