See it in action
The actual app — not mockups.
Most duplicate finders only catch byte-identical files. Duplex AI also catches reworded documents, recropped or recolored photos, and the same song across different bitrates — using real semantic embeddings, CLIP vision, and audio fingerprinting. Everything runs locally; your files never leave your computer.
Downloads for Windows · Free for exact duplicates · No credit card required · Windows & Mac (Apple silicon only)
The actual app — not mockups.
Duplex AI isn't code-signed. A signing certificate costs money every year, and this is a one-person, first-time project that hasn't earned that yet. Because of that, Windows SmartScreen flags the installer as from an "unknown publisher". That is normal for small, new apps, and it is a statement about the missing certificate, not about what the app does. Here's exactly what you'll see and what to do.
Click "More info"
Windows protected your PC
Microsoft Defender SmartScreen prevented an unrecognized app from starting. Running this app might put your PC at risk.
More info
Click "Run anyway"
Windows protected your PC
App: Duplex AI Setup
Publisher: Unknown publisher
macOS shows a similar warning for the same reason (the app isn't signed or notarised by Apple). On older macOS, right-click the app → Open → confirm. On macOS 15 and newer, try to open it once, then go to System Settings → Privacy & Security, scroll down and press Open Anyway.
Duplex AI is a brand-new, one-person project. Here is what is and isn't there yet, said plainly.
Paid code-signing certificates are out of reach for now, so Windows (and some antivirus tools) will warn about an unknown publisher. The steps above get you through it. If your antivirus flags it, that is a false alarm caused by the missing signature and the app being new. Please tell us and we will report it to the vendor.
The Mac app is built for Apple silicon (M1, M2, M3 and newer). It does not run on older Intel Macs. It needs a recent version of macOS, and isn't notarised by Apple (see the note above on how to open it).
The Mac version passes our automated tests on Apple's own build machines, but the developer doesn't own a Mac, so no person has used it on real hardware yet. It should work. If something doesn't, we'd really like to hear about it.
Duplex AI is the first thing I've ever sold, and I'd be genuinely thankful if you tried it and tracked down as many bugs as you can: anything that crashes, confuses you, looks wrong, or finds the wrong duplicates. Every report, big or small, makes the app better for everyone, and I read all of them.
Nearly every competitor stops at file hashing. This is the actual detection engine.
Sentence-embedding + FAISS search catches reworded or reformatted duplicates that plain text-diffing can't.
Finds visually duplicate photos even across crops, recolors, and resolution changes — not just identical files.
Chromaprint fingerprinting identifies the same track across bitrates and formats — MP3, FLAC, WAV, and more.
A 3-layer fusion of frame hashing, CNN embeddings, and audio-track matching catches re-encoded duplicate videos.
Every scan runs entirely on your machine. Nothing is uploaded — this isn't a cloud service scanning your files.
Duplicates move to your Recycle Bin / Trash, never a permanent delete — undo is always one click away.
| Capability | Free | Pro |
|---|---|---|
| Exact duplicate detection (byte-for-byte) | ✓ | ✓ |
| Near-duplicate text documents (TF-IDF) | ✓ | ✓ |
| Safe delete to Recycle Bin / Trash | ✓ | ✓ |
| Choose which copy to keep, or apply a rule (newest / oldest / shortest path) | ✓ | ✓ |
| Protected folders: files in them are never deleted | ✓ | ✓ |
| System folders are blocked; warning before deleting from drives with no Recycle Bin | ✓ | ✓ |
| Live progress and a Cancel button on every scan | ✓ | ✓ |
| Filters: minimum size, skip folders | ✓ | ✓ |
| Duplicate folders: spot two identical folders and remove one in a click | ✓ | ✓ |
| Scan several folders together (and find duplicates between them) | ✓ | ✓ |
| Re-checks every file before deleting, so nothing that changed since the scan is touched | ✓ | ✓ |
| OneDrive / iCloud / Dropbox aware: online-only files are never downloaded by a scan | ✓ | ✓ |
| Handles very long paths and non-English file names | ✓ | ✓ |
| Scan history and a running total of the space you have freed | ✓ | ✓ |
| Semantic document matching (AI embeddings) | — | ✓ |
| Image matching across crops/recolors (CLIP vision) | — | ✓ |
| Audio fingerprinting (same song, different bitrate) | — | ✓ |
| Video deduplication (frame + audio fusion) | — | ✓ |
| Batch auto-clean recommendations | — | ✓ |
| Report export (TXT / CSV) | — | ✓ |
| Windows & Mac | ✓ | ✓ |
Start free. Upgrade when you need the AI-powered modes.
Prices shown in your local currency where we can tell, otherwise in rupees with dollars in brackets. The amount you pay is confirmed on the checkout page.
$0
Forever
₹60/mo
or ₹500/yr — save ~31%
No. Every scan — including the AI modes — runs entirely on your own machine. Nothing is sent to a server.
Nothing, until you say so. You review every group and pick what to remove. Deleted files go to your Recycle Bin / Trash. The exception is USB sticks and network drives, which have no bin: there a delete is permanent, and the app asks you to confirm first. As with any tool that deletes files, keep a backup of anything you can't afford to lose; the Terms explain who bears the risk.
Yes. Pro is a monthly or yearly subscription you can cancel whenever; it keeps working until the end of the period you paid for. See the refund policy.
64-bit Windows (tested on Windows 11; Windows 10 should work too) and Macs with Apple silicon (M1 or newer). Intel Macs are not supported. See "Good to know" above.
This page detects your country (via a privacy-light IP lookup, no account needed) and shows pricing in ₹/$/£/€ accordingly. If it can't tell where you are, you see rupees with the dollar price in brackets. These are display prices. The exact amount, including any tax and your bank's conversion, is shown on the secure checkout page before you pay.