What it is: Image filters and effects that easily make your travel photos and videos look like sketches.
How it works: Tap the magic wand icon to choose from one of 12 effects or to choose no effect. PowerSketch shows you what the image will look like before you snap it or start the video recorder.
Why it's great: Unique effects include Picture in Picture, which shows most of your image as a standard photo while the center of the image appears as a sketch. Unlike some other sketch apps, what you see in preview mode is what you'll get; no ads clutter the screen; it's free; it does photo and video and allows you to share images via email, YouTube, Facebook, Twitter, Flickr and Tumblr.
Why you might hesitate: Why is there no option to import photos you've already taken so you can give them the PowerSketch treatment? Many other apps, such as the free-but-less-feature-rich Sketch+ can do it.
Whom it's for: Travelers who want their photos and videos to have an extra something special.
OSnap (99 cents; iPhone, iPad, iPod Touch)
What it is: Time-lapse photography that's simple to control.
How it works: Choose from four types of stop-action photo setups: group shot, daily portrait, onion skin and rapid shot. The camera rapidly takes shots as the subject(s) move around (except in daily portrait mode, in which the subject stands still). After you press the stop button, OSnap stitches together the separate shots into a stop-action movie. In daily portrait mode, use your device's rear-facing camera to take self-portraits, aligning your eyes to two marks overlaid on the camera frame. That keeps your head in the same spot for each portrait you take, once a day over a year or several years, if you want. OSnap stitches the images together into a time-lapse video that shows your background and clothing rapidly changing, while your head remains still. In onion skin mode, snap a photo and OSnap shows you a faded version of that photo while you move into a new position.
Why it's great: You control how many photos per second the camera snaps, the types of overlays that keep your images aligned and consistent. The bounty of options never feels overwhelming or superfluous. .
Why you might hesitate: You don't care about time-lapse video.
Whom it's for: Inventive photographers who want eye-catching videos.
Netrobe (free; iPhone, iPad, iPod Touch)
What it is: A photographic way to manage your wardrobe.
How it works: Photograph your clothing separately, then easily mix and match separates to plan what you're going to wear a week or more at a time. Share your fashions with your friends.
Why it's great: Makes "What should I pack for vacation?" easy to answer. Flip through photos of your clothing to mix and match, then grab your choices out of the closet and put them in your suitcase.
Why you might hesitate: If your wardrobe isn't complicated, taking pictures of each item can be a waste of time.
Whom it's for: Stylish travelers who want a fun way to get a handle on their wardrobe.