These are the only 3 apps Apple and Google both agreed were the best of 2015

Robinhood is an app built around one promise: no-fee stock trading. The app makes trading cheap, intuitive, and mobile. The beautiful interface also won an Apple Design Award.

Price: Free (iOS, Android)

Jet is a shopping platform that promises to give you big savings. Jet calls itself the "ultimate shopping hack," and with easy reorders, free shipping, and returns, its ultimate goal is to challenge the likes of Amazon.

Price: Free (iOS, Android)

HBO's stand-alone app lets you access all its original programming, shows, and movies straight from your iPhone or iPad. The app has a sleek design that, according to Apple, "sets the standard for high-quality TV streaming services."

Price: Free, subscription $14.99 month (iOS, Android)

Additional reporting by Tess Danielson.