Apple Photos: a solid place to start
Apple Photos includes albums, media-type collections and a Duplicates utility on supported iOS versions. It works well for people who prefer built-in organization and do not need a dedicated review workflow.
Swipe-based review apps: hands-on decisions
Apps such as LumoKeep make it easier to work through pictures individually, compare similar shots and build a deliberate deletion selection. They suit users who want direct control over the choices.
Automatic cleaner apps: convenient but verify first
Some cleanup apps offer automatic duplicate detection or bulk recommendations. Review how an app defines a duplicate, whether it shows selected files and whether a final confirmation is required.
Quick comparison of approaches
Apple Photos: built-in, no additional app, and useful native collections. Manual swipe workflow: sequential review, more deliberate choices, and an extra app. Automatic suggestions: potentially fewer taps, but each app's detection and review behavior differs.
How to decide
If your priority is reducing clutter without rushing deletion, start with native Photos categories and then try a swipe-review tool. If speed is the main goal, verify the selection and privacy behavior of any automated tool before deleting.