ScreenStack is for people whose photo library is mostly screenshots they are afraid to delete. New screenshots from the system album, or ones shared in from Photos or WeChat, are grouped into batches and sorted into four buckets. Fix a wrong call once and it becomes a visible, editable rule. Text is recognized on the device, so a search for "Wi-Fi" or "order number" returns a field you can copy. Before a delete, a receipt lists the fields already saved from that shot. Deleted items go to an in-app trash first, and credential screenshots keep an original copy. An offline backup is free. Optional AI uses your own API key; the core features need none. Import, sorting, search and basic cleanup are free; Pro is a one-time purchase, not a subscription.