Horizon Camera is a camera app that makes you always record video in a horizontal aspect ratio, even if you tilt the device. It works very simply, and it's intuitive too. It has a dynamic frame on the screen that automatically adjusts to your movement.
The free version of the app has a small inconvenience, which is leaving a watermark on one of the corners of the image. Still, it's not a particularly annoying one.
In the settings, you can choose the video quality you want, and the type of stabilization too. You can also choose to see advanced information on the video you are recording.
Horizon Camera is an excellent camera app that helps you avoid filming vertical videos, which is particularly helpful if you want to share them on Facebook or YouTube later.