PowerPhotos 3.4.8 for macOS

Apple's Photos app was built for one library at a time. That works until you split a big collection across separate libraries, or you're holding onto an old iPhoto archive you never merged. The mess gets old fast. PowerPhotos steps in and gives you a single window to juggle all of it without losing your mind.

Browse and deduplicate across multiple libraries

• Working with multiple Photos libraries on one Mac, side by side.
• Browsing photos inside any library without closing and reopening the Photos app.
• Finding duplicate images and comparing them before deciding what to delete.
• Searching across every library you have at once—no more guessing where a photo lives.
• Trimming iCloud storage costs by moving older projects into separate, smaller libraries.

English-only interface, separate from iPhoto manager

• The interface is available in English only.
• It's a separate tool from Fat Cat Software's older iPhoto Library Manager.

Merging three neglected libraries in one afternoon

Last weekend I sat down to sort through three libraries I'd been ignoring since the holidays. Here's how it went.

First, I opened PowerPhotos and saw all three libraries listed in the left panel—home photos, a library full of product shots for the restaurant website, and an old iPhoto collection I dragged over from the old MacBook. No switching, no guessing. I clicked the home library icon, and the photos appeared right there in the main area, same familiar grid I'm used to from Photos. I didn't even open the Photos app.

Next, I used the search bar at the top to look for "menu board" across all three libraries at once. Turns out I had versions of the same shot scattered everywhere—some in the product library, some in home photos from the night I tested the layout at the counter. That cross-library search alone saved me twenty minutes of digging.

Then I picked both libraries and clicked Find Duplicates. PowerPhotos chewed on it for a few seconds and showed me side-by-side pairs—same chalkboard, slightly different crop, same date. I clicked through each pair, kept the best exposures, and let the app delete the extras. The duplicates analysis even caught a handful of burst-mode sequences I forgot I ever took.

After that, I dragged a few albums from the home library into a fresh empty library I called "archive-2023," then closed it. The Photos app never opened once. That's what sticks with me: you can do the heavy lifting without Photos ever loading a library you're not ready to touch.

A filing cabinet for your Photos libraries

PowerPhotos doesn't replace the Photos app. It sits alongside it like a filing cabinet next to a desk. When you're ready to edit or share, you still open the library in Photos and do your thing. PowerPhotos handles the library management Photos never learned.

It plays nice with Finder too. Libraries live wherever you put them—internal drive, external SSD, network folder—and PowerPhotos just points to them. I keep my active libraries on the Mac's internal storage and move older archives to a Samsung T7. The app doesn't care; it just shows the library grayed out if the drive isn't plugged in.

For iCloud users, the workflow makes sense. You can keep one library synced with iCloud for the daily phone-to-Mac stream, then split off completed projects into standalone libraries that don't touch cloud storage. That's how I stopped paying for the 2TB iCloud tier last year.

If you use backup tools like Time Machine or Carbon Copy Cloner, the libraries are just regular files on disk. PowerPhotos doesn't wrap them in a weird database format or lock them away. A library is a library—Photos opens it, PowerPhotos browses it, your backup software copies it like any other folder.

Duplicate scan across 16,000 photos in 15 seconds

On an Apple Silicon Mac, the duplicate scan is quick. Running it across two libraries with about 8,000 photos each took maybe fifteen seconds. The side-by-side comparison view loaded instantly when I clicked through pairs. No beachballing, no jittery scrolling.

Memory use stays reasonable. With three libraries indexed and a duplicate scan running, I saw about 400MB of RAM in Activity Monitor. Idle, it drops closer to 120MB. It's not a lightweight menu-bar utility, but for the amount of photo metadata it's juggling, it's well-behaved.

I've had one crash in two years, and that was when I unplugged an external drive while a library was still open in the app. Reopening the library after reconnecting the drive brought everything back without any corruption. Not something I'd recommend testing on purpose, but the recovery was drama-free.

One thing to know: when PowerPhotos is actively deleting duplicates or moving photos between libraries, it locks up the affected libraries in Photos. That's just how the Photos database works—only one process can touch it at a time. The app warns you before starting any operation that requires exclusive access, so you're never surprised by a locked library.

For anyone grabbing a powerphotos download and running it alongside a big Photos collection, the experience stays snappy even when libraries live on spinning external drives. Searches across network volumes take a beat longer, as you'd expect, but browsing and comparing photos on local storage feels like using Photos itself.

Bottom line: it's stable enough that I forget it's running until I need to do something Photos can't handle on its own.

• macOS 14 or later
• Apple Silicon and Intel Macs
• Works alongside Apple's Photos app