Roll Sorter is a photo cleaner built with Flutter: sort your camera roll one photo at a time, like flipping through slides on a lightbox. Swipe left to mark for deletion, right to keep; your library opens as boxes of months and you pick up where you left off. Nothing is deleted by swiping — review, then send to the trash (Recently Deleted keeps them 30 days). Unlimited undo. Tools find similar and duplicate photos (sharpest shot suggested), screenshots and large videos. Everything stays on the phone: no account, no ads, no uploads. Free for 3 days, then swiping stays free with 50 photos a day to the trash; a one-time lifetime pass removes the limit.