Sure--I recommend whatever gets you to practice every day. If that's an app, then use an app. If it's a book or an in-person class/group or a meditation buddy, use that.

I started with an in-person class and audio guided meditations, and then "graduated" to Insight Timer (just white noise with a bell at the end) once I felt like I was getting the hang of it. In the beginning it felt like the spoken guidance was helpful, then after a while it started to feel like it was distracting me or holding me back, so I stopped using it.