Dupligo: Duplicate Photos

Rehan Ahmed Allahwala

About this app

Find the duplicate photos filling up your storage, see exactly how much space you would get back, and delete only what you choose.

Dupligo scans the photos you give it access to and groups genuine duplicates together. Nothing is deleted automatically. Ever.

HOW IT FINDS DUPLICATES - AND WHY THAT MATTERS

The free version finds exact duplicates by calculating a SHA-256 checksum of each file's full contents. Two photos are only grouped as duplicates when their contents are byte-for-byte identical. That is a mathematical certainty, not a guess, so you are never asked to delete a photo that merely looks similar to another one.

To stay fast on a large library, the app first groups files by size - files of different sizes cannot be identical - and only then checksums the candidates.

Premium adds visual similarity detection using perceptual hashing, which finds near-duplicates like burst shots, slightly edited copies and re-saved images. These are always labelled "similar", never "identical", and shown separately from exact duplicates, because deciding which of two similar photos to keep is your call, not an algorithm's.

SAFETY COMES FIRST

Deleting photos is permanent, so the app is built to make mistakes hard:

- Nothing is ever deleted without you approving it
- In every group of duplicates, one copy is always kept - the app will not pre-select every copy in a group
- By default it keeps the best copy (highest resolution, then oldest) and selects the rest
- A review screen shows exactly what will be deleted, with thumbnails, names, sizes and which copy is being kept, plus the total space you will recover
- Android itself then shows its own confirmation dialog before anything is removed
- If a deletion fails or you decline it, the app tells you precisely what happened to each file

TRY IT FREE, THEN UNLOCK ONCE

Your first scan is free, so you can see what the app finds in your own library before paying. After that, a single one-time purchase unlocks unlimited scanning. No subscription.

Deleting is never restricted. Once a scan has shown you your duplicates, you can review and remove them whether or not you have purchased - we are not going to find your duplicates and then charge you to deal with them.

WHAT YOU GET

- Scan the photos you authorise
- Exact duplicate detection by full-file SHA-256 checksum
- Duplicates grouped together with previews
- File details: name, size, dimensions, date and folder
- Choose exactly which copies to remove
- Running count of selected files and space to be recovered
- Full review screen before any deletion
- Cancel a scan at any time
- Works entirely offline

PREMIUM - ONE-TIME PURCHASE, NO SUBSCRIPTION

- Unlimited scans
- Visual similarity detection with an adjustable strictness setting
- Batch review tools: select all but the best copy across every group at once, still subject to the keep-one rule and the review screen
- Filter by file size, date range and folder
- Detailed storage reports

One payment unlocks premium permanently. No subscription.

PRIVACY AND PERMISSIONS

This app needs permission to read your photos, because finding duplicates means examining your photo library. That is the only reason, and it is the only media permission requested.

- It does NOT request "All files access"
- It does NOT request write-storage permission
- Your photos are never uploaded. They are read only to compute checksums on your device.
- The app does have internet permission, required by Google Play's billing library to confirm the optional upgrade. We do not use it for your photos, and scanning works in airplane mode.
- No account, no ads, and no analytics added by us

On Android 14 and later you can grant access to selected photos only. The app will scan just those and tell you it is working with a partial selection, rather than nagging you for more.