Apple Photos didn’t find your similar photos
You opened the Duplicates album expecting it to deal with the four almost-identical shots of the same moment, and it either showed you nothing or showed you a handful of exact copies and stopped. That is not a bug, and there is nothing wrong with your library. The shots you are looking for are not duplicates.
The short answer
Four exposures of one moment are four different photographs. The pixels differ, the timestamps differ, and somebody moved between them — which is the entire reason you took four. Anything looking for copies of a file will pass straight over them.
And a burst is not even several items. It is one item with many frames inside it, which is why it has that stacked thumbnail. Nothing that compares one library item to another can look inside it at all.
What the Duplicates album actually does
Apple's own description is short. Duplicates “appear automatically in the Duplicates collection in Utilities”, and “depending on the size of your library, duplicates may take some time to appear as Photos analyzes your photos”. When you merge, “one original photo or video appears where the selected duplicates were located in your library”, and the rest go to Recently Deleted, recoverable for 30 days.
Notice what Apple does not say: what counts as a duplicate. The guides that confidently tell you it is “exact copies only” are guessing, and they disagree with each other. What is documented, and what settles the case that probably brought you here, is the burst — Apple's own instruction is to open it and use Make a Selection to save a frame “as an individual photo”. Until you do, those frames are not library items, so they cannot be compared with anything.
All of which makes the Duplicates album a good tool that is answering a different question from the one you asked.
Everything that clears near-identical shots on a Mac
| What | Made by | Price | What it is |
|---|---|---|---|
| Photos → Duplicates | Apple | Free | Built in, under Utilities, and the safest thing on this list — merging keeps one original and the rest go to Recently Deleted for 30 days. It does not surface separate exposures of one moment, and it cannot look inside a burst. |
| Photos → Make a Selection | Apple | Free | The right tool for one burst: open it, pick the frames worth keeping as individual photos, and choose whether the rest go. Manual, and one burst at a time. |
| PhotoSweeper | OverMacs | $14.99 once | macOS 10.15 or later, Intel included. Reads the Photos library, plain folders, external drives, Lightroom Classic and Capture One, and sweeps a very large collection fast. Marks keepers by rules you adjust — file size, resolution, date. |
| Photiva | Photiva | $29.99 once, after a free scan | macOS 14 or later, Apple Silicon and Intel. Its page describes one pass covering duplicates, near-identical shots, blurry frames and organising by date, with quality-aware selection and blur scoring. |
| PowerPhotos | Fat Cat Software | Trial, then paid — its page does not state a figure | macOS 14 or later. Built around managing and merging whole Photos libraries; it shows you duplicates side by side and you pick. Its page does not say how it treats near-identical shots. |
| Gemini 2 | MacPaw | Subscription, from $1.95/month | macOS 10.10 or later — by far the widest reach here. Finds similar files as well as exact copies, across the whole Mac rather than just photographs. |
| Photosteward | Tidymill | CHF 15 once | macOS 26 and Apple Silicon only, which is the narrowest requirement on this list. One library, no folders, no drives. It runs continuously, judges the picture rather than the file, and gives a reason for every photo it sets aside. |
Checked against each maker's own pages on 31 August 2026. Prices and requirements move; if something here is out of date, tell me and I will fix it.
The thing the list has in common
Every paid option above will find the shots. They differ in what happens next — in which one of the four they hand back to you. Most decide on the file: the largest, the sharpest, the highest resolution, by rules you can adjust. That is a defensible answer, and for a folder of scans or landscapes it is probably the right one.
It is a poor answer for a family library, because the difference between four shots of the same moment is almost never sharpness. It is who blinked. The sharpest frame of a burst is frequently the one you would never print.
What Photosteward does instead
It gathers each moment into a group and keeps one photo. When there are faces in the group it weighs those first — eyes open, everyone smiling, more faces clearly visible — and only then framing and sharpness. A group with nobody in it is judged on the picture alone, which is the case the older tools already handle well.
Every choice carries its reason in plain language, and one keystroke keeps a different photo instead. Nothing is moved or changed while it decides: the rest are set aside in an album until you press the button, and then macOS asks once more with its own dialog.
On a library kept in iCloud with “Optimise Mac Storage” it works from the previews already on your Mac, fetching originals only for the groups that need a closer look.
It has been measured against one library and the numbers are worth stating plainly: over a reference set of 31 folders and 88 of the maker's own family photographs, it grouped 24 of the 31 exactly with no false merges, and chose the same photograph as the person in 25 of the 30 folders where a winner had been named. That is a floor taken from one family's photos, not a promise about yours — and the five it got wrong are published beside the reasons the person gave.
Questions
Why doesn't my burst appear in the Duplicates album?
Because a burst is not several photos in your library — it is one item with many frames inside it, which is why it has its own stacked thumbnail. Nothing that compares library items to each other can see inside it. Apple's own answer is Make a Selection, which saves the frames you choose as individual photos.
Are near-identical shots actually costing me storage?
Yes, and more than duplicates usually do, because there tend to be far more of them. Every frame is a full photograph — its own file, at full resolution, on the Mac and in iCloud. Four shots of one moment cost four times what one costs.
Is it safe to let another app into my Photos library?
It depends entirely on what the app is allowed to do, so it is worth checking before you install anything. The two questions that matter: does it delete on its own, and can you see exactly what it would remove before it happens. Anything that answers badly to either is not worth the risk to a family library.
If I delete them on my Mac, does iCloud get the space back too?
Yes, once the deletion syncs — a photo removed from an iCloud Photos library is removed everywhere it was synced, and it waits in Recently Deleted for 30 days before the space is actually released.
What Photosteward does, in full · Compared with PhotoSweeper · Compared with Photiva · Download Photosteward 0.1.2 — free to try
PhotoSweeper, Photiva, PowerPhotos and Gemini are not affiliated with Tidymill and have not endorsed this page. Their names and trademarks belong to their owners.