Been using Kicker U for a couple months now. It’s basically an app that helps you design and build custom car audio setups. Pretty solid if you’re into that kinda thing.
There’s all sorts of calculators and tools to figure out stuff like port dimensions and subwoofer tuning. And you can even upload the specs for any driver you own and it’ll help you build the perfect box. It’s got a Facebook community and a dealer locator too, which is pretty handy.
Look, if you’re into car audio and want to level up your system, you’ll probably like this app. It’s not perfect – the UI can be a little confusing at first – but overall it does the job. Worth checking out if you’re into that sort of thing.