Video stabilization is a big deal in smartphone tech right now. The leader, Hyperlapse, is an Instagram founded app that allows you to take video and stabilize and then speed it up. Only problem? Those horizontal timelapses end up looking a bit, well, sideways. Here's an app that will fix them:
The Crop Video Square app is totally free for iOS (not yet available for Android) and it's ridiculously easy to use. Just import a video and pinch and rotate with your fingers or use the built in degree plus/minus menu.
Without it, Instagram process horizontal hyperlapses like this:
On all my future lapses, I was able to rotate them and even keep them in their original wide format: