VideoBite is a free iOS app from Adobe that lets you edit video or create slideshows with titles, transitions and music. The app is hardly alone in the video-editing space, but an Adobe app is always worthy of some attention. To a degree, the app is a Trojan horse to sell Adobe's Revel service, which is US$5.99 a month, although it is not required to use this app. Revel is cloud-based, and lets you share photos and videos to any computer or iOS device. Bypassing that, videos can be saved to your camera roll, and shared via email, text or uploaded to Facebook or YouTube.
The app asks for access to your camera roll. You can add clips, edit them and assign transitions; you can also create a title and end card, and select music, either tunes that are on your iPhone or music supplied by the app.
Putting together a movie is easy enough. You can trim the clips, and assemble them into a movie. There is a quick help feature, but I think most people won't need it. The app also provides a feature called "Looks," which is basically a set of filters that change the color, saturation and contrast over your video.
One nice feature is the ability to use still photos to create a movie. It's also easy to do, and while there are other apps that accomplish the same thing, Adobe gets points for mixing stills with video editing. Unless I missed it, I don't see any way to insert a still photo into a video, or to go the other way -- inserting video into a movie of stills.
One caveat. I couldn't run the app on my iPhone 5s at all. The app crashed instantly. I'm pretty sure that's due to my running iOS 7.1 beta. I asked three people to try the app on the release version of iOS and they could run it fine on iPhone 5 models. VideoBite also ran OK on my iPad in 2x mode, as the app is not universal. My iPad is running the release version of iOS 7. You may encounter issues, but the app is free, so the risk is low.
Apple's own iMovie is a bit more powerful, but it's $4.99 (or free if you have a newer iOS device). There's also a free app called simply Video Editor that gets generally good reviews from users. It's ad-supported, and there are in-app purchases to make it full-featured.
Adobe Videobite is worth a try, and the more competitive the editing field gets, the better it is for users.
As mentioned, VideoBite is not a universal app, but it seems well-behaved on iPads. The app requires iOS 6.0 or later, and it is optimized for the iPhone 5.