Speaker Boost claims to make your smartphone's speaker louder, but while it may function properly on some devices, it doesn't work on Android 4.2, Jelly Bean. Despite being a seemingly well-made app with a remarkably friendly interface, it doesn't seem to generate any volume boost -- not a noticeable one at least.
Speaker Boost doesn't require any special permissions to run, which is quite nice. When you load the app on your phone you can use a slider to choose how much of a boost you want. By default the maximum is set at 60, but you can change this in the Settings. You can start with 40 percent but can go up to 100 percent if you feel courageous. For testing purposes we tried boosting even to 100 percent, but there was no significant change on our device running JB 4.2. The app didn't make the speaker or the headphones plugged into our phone any louder. It had no impact on the audio volume or quality.
Still, Speaker Boost is a tiny app, and you have nothing to lose if you try it out. Maybe it works better on some smartphones than on others. In our case, though, Speaker Boost just didn't work.