Well, it depends on whether you’re Android or Apple. I tried to find my Android apps for my daughter’s phone, but not all of them are cross-platform. For Android, I’ve used Huegasm, Huemanic, H3Party, Hue Switcher, All 4 Hue, Lumio, and Hue Goal Light. All of those have let me designate either individual lights or rooms.
On my daughter’s iPhone, I bought a collection by Mediavibe that included Hue Fireworks, Hue Thunder, Hue Disco, Hue Body and Soul, Hue Twister (kinda fun if you still play the game – it shows the color and tells you which hand/foot). Every app I’ve used allowed me to designate which lights to use.