Similar to Vhoto, StillShot from Macadamia Apps allows you to grab a still photo from a video. While Vhoto automates the process for you, StillShot allows you scroll through the video frame-by-frame and choose the best shot.
StillShot is extremely easy to use. Just open the app, select your video from your video library (StillShot filters out your photos, showing only your video clips) and scroll through the frames. When you find an image you like, hit the "Share" button, and it will be saved in full resolution to your camera roll. You also have the option to post the image to Facebook, share it on Twitter or print it.
The UI of StillShot is straightforward and understandable. The main part of the screen shows each still photo in the video and labels it according to its place in the video clip. The position label includes both a timestamp and frame number. The app also shows a video timeline at the bottom with a marker that allows you to see where you in the overall video clip. This is very useful if you know you want a still from the middle of a very long clip.
StillShot opened both long (3:00 minute clips) and short clips without any issues or slowdowns in performance. It was easy to export frames and fun to be able to choose them, as long as you have some patience. I'll admit that scrolling through hundreds of frames showing very similar content can be cumbersome. Several times I just wanted to give up and run the video through Vhoto and have it pick out my best shots. Then I remembered the trade-off -- Vhoto is fast, but it is not always accurate, choosing a photo of someone at the start of a jump instead of mid-air. StillShot may be slower to process because you are doing it manually, but this hand-picking ensures you get that best mid-air shot.
There was one quirk with StillShot I encountered that is worth a mention. Sometimes the frame numbering of the video was askew. For example, the label for frame number 1 in the 00:06s of the video appeared after frame number 29 in the same 00:06s. It was a labeling error as the frames appeared in the correct sequence of the video. I found the mislabeling odd, but not a major inconvenience. This glitch could be problematic, though, for someone keeping track of several individual frames in a long video clip.
StillShot is available for US$0.99 from the iOS App Store. It hasn't been updated in a while, so it has a sometimes jarring iOS 6 look and feel. Despite the semi-old code, the app still performed well on my iPhone 5s running the latest version of iOS 7.