rePhoto helps turn your iPhone or iPod Touch into a more accurate rephotography device. Use it to take a picture from the same spot days, months, or even decades later, with four overlay methods to align your before and after photos. You can even create longterm time-lapse sequences without having to leave your camera behind.
rePhoto works with both front and back cameras, and can start with any image in your photo library, including images taken by other cameras.
This app was written primarily to support citizen science via Project rePhoto. If you do not want to participate, or are not in an area of the world with active projects, you are still welcome to use the Personal rePhoto feature on images in your own photo album.