READ description first! Does NOT convert to normal speed. – Slomo+ Your Slow Motion Video Converter Review

It says it right there in first paragraph: it preserves the slow motion. Here's what it does: Just like film movies, digital videos are a series of single pictures that appear one at a time very quickly. How quickly they appear is measured in frames-per-second (fps). The fps of a video is mostly determined by the camera or software used to create the video. Devices and software used to watch videos can only show videos made at certain fps rates. 30fps is one of the most common rates and can be played back on most devices and edited in most software. The iPhone shoots slow-motion at either 120 or 240 fps. Some devices/software can't play/edit videos with such a high fps. You may have seen that if you share a slow-motion video with someone who doesn't have an iPhone, it either won't play at all or plays at normal speed. Even some video apps available for the iPhone won't play them in slow motion. So this app takes the videos shot at 120 or 240 fps and converts them to the more universal 30 fps so pretty much any app or software or device will play them back in slow motion as you originally shot it. The downside is the quality will be lowered and the ability to edit it the way you want might be hindered.
Review by DJ Rizzo on Slomo+ Your Slow Motion Video Converter.