Price: $2.12 after 7-day trial

Is your audio too low when you're using headphones or ear buds? Well, this app can boost the volume; a great feature if you're working out or are in a noisy environment.

You can manually activate the volume boost or set it to automatically start when booting your Android device. It also offers a widget that you can add to your home screens to quickly turn it on and off with a single button click.

When I tried it, I did notice a slight audio increase when using this app. It boosts the volume just enough so you can better hear Pandora, MP3s or whatever you're listening to. It includes a 7-day free trial and then you must purchase it for $2.12 to continue using it.

Since I go on regular bike rides and have a hard time hearing audio with my ear buds, it's certainly worth the two bucks and change.