Spotlighter for iOS
Spotlighter is a small photo-editing app for iOS that lets you highlight a custom region within an image by applying a spotlight-like effect: the background is dimmed down, and the boundary between foreground and background is blurred:
Photos edited from within the app can be shared through a standard activity view to the user’s various social media accounts, or sent by e-mail, AirDrop, etc.
Spotlighter also comes bundled with a Photo Editing Extension, so you can also apply the filter from within the default Photos app.
For bug reports and feature request, contact me on Twitter (@nicolasmiari).