CamMe is a photo taking app with a very special function in it that allows you to take self pictures or timed photos without having to set a timer. Instead the app uses gesture recognition on the front-facing camera combined with two very specific motions to take such images. The result is not perfect, but it solves a very real problem for a lot of users -- how to take selfies without holding the camera.
CamMe is designed for taking selfies so the tools here are focused almost entirely on the front-facing camera. You can flip the camera around to the back-facing option, but it's not necessarily the tool you signed up to use, so it's not designed with that in mind. The core function here is to enable you to take photos with gestures instead of your fingers, which can be tough. To do so, you hold up your hand and then close your fingers as indicated on the screen. Don't worry: it will show you exactly how to do this for better results. Once you do this, the timer starts and a photo is taken.
While other photo taking options and features would always be welcome in an app like CamMe, the basic tool here works as intended and will solve a lot of problems for people trying to take self photographs without it looking obvious, or needing a mirror. If you take a lot of photos of yourself alone or with friends, then this is an app you should consider downloading.