PowerPhotos 3.4.8 — Mac version

One library with 40,000 photos. It's a common story. The built-in Photos app handles it, but scrolling gets sticky and iCloud fills up. PowerPhotos gives you back some control without leaving the Photos ecosystem.

1. Pick your library. You can keep a separate library for client work, one for family snaps, and a smaller one for current projects. The app lists them all in one window. Double-click to switch — no holding Option at startup.
2. Search everywhere at once. Looking for a photo of a red bicycle but can't remember which library it's in? A single search runs across every library you've added.
3. Find duplicates. The duplicate browser compares photos side by side. It spots copies even when they've been edited, exported, or given different filenames. You decide which to keep.
4. Split a bloated library. Rather than scrolling through years of photos, you can peel off a chunk — say, everything before 2020 — into its own library. Handy for freeing up space and making iCloud storage manageable again.

It's all done within the rules of the Photos app. Your libraries stay where they are; PowerPhotos just gives you a better way to move between them and keep them tidy.

When a library won’t open because Photos has it locked

Most trouble comes down to permissions and library locks. Here are the ones that crop up at the repair café.

• "PowerPhotos can't open my library." The Photos app might have it locked. Close Photos completely, then try again. If a library lives on an external drive, check it's mounted and the drive isn't formatted NTFS — Macs can read NTFS but not write to it, and PowerPhotos needs write access.
• Duplicate scan takes forever. A library with tens of thousands of photos will need time. Let it run overnight if you can. Plugging in the power adapter stops the Mac from dozing off mid-scan. You can also scan smaller libraries first while you get the hang of the duplicate browser.
• Merged libraries create new duplicates. If you drag albums between libraries that both contain some of the same photos, you'll end up with fresh copies. Run the duplicate scan after merging, not before, so you catch the extras in one go.
• "I deleted the wrong copy." The Photos app's Recently Deleted album still works. Check there straight away — you've got 30 days to pull photos back.

Duplicate finding versus the cleanup-only apps

Three tools people often weigh up when they search for a powerphotos alternative are Duplicate Photos Fixer Pro, Gemini 2, and PhotoSweeper. They overlap in different ways.

Duplicate Photos Fixer Pro is a straightforward duplicate finder. It scans folders and the Photos library, but it doesn't touch library management — no splitting, no merging, no switching between libraries. If all you want is to zap duplicates and move on, it does that one job. PowerPhotos wraps duplicate detection into the bigger task of wrangling multiple libraries.

Gemini 2 hunts duplicates across your whole Mac, not just Photos. It's quick and the interface is dead simple. The trade-off: it looks at image files, not at the relationships inside a Photos library. It won't spot that two copies are linked to the same album or that one is an edited version of the other. PowerPhotos understands the library structure, so it catches duplicates Gemini misses.

PhotoSweeper is the closest comparison. It also works with Photos libraries and has powerful comparison settings — bitmap analysis, histogram matching, time interval filters. What it lacks is the library-splitting and merging side. If your main job is aggressive duplicate hunting with fine-grained control, PhotoSweeper is strong. If you need to split one library into three and then clean up duplicates, PowerPhotos covers the whole workflow.

A real-world morning with a wedding photographer

Liz shoots weddings most weekends. By Tuesday her main Photos library swells to about 15,000 new images — culled from 4,000 keepers, but still heavy. She uses powerphotos mac to keep each wedding in its own library. Monday morning she creates a fresh library named after the couple, imports the raw selects, and gets to work in Photos. The main library stays light for personal snaps.

Halfway through editing she realises she's pulled in some shots twice from a backup card. She fires up the duplicate browser on that single wedding library, compares side by side, and strips out the extras in a couple of minutes. When the album is delivered, she merges the finished library into an archive library on a big external drive — keeping her Mac's internal SSD free for the next job. One search across all her wedding libraries later finds that shot of the confetti she wants for her portfolio site. No digging through folders, no guessing which library it's in.

• macOS 14 or later
• Works on Intel and Apple Silicon Macs