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Anti-Twin

antitwin.org

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Spec score 8.1 #6 of 38 in Duplicate File Finders

What it is

Anti-Twin searches hard disks and other storage locations for duplicate or similar files. It can compare names, check file contents byte by byte, search for binary similarity, and compare images by their pixels. The image method can find similar pictures even when they have different compression rates or file formats. Search locations include local drives, USB flash disks, memory cards, shared network folders, and a second folder or path. Results can be selected automatically, exported as an Excel file, and sent to the Recycle Bin or deleted.

The program is free for private use and dates to 2003. The download page lists 32-bit and 64-bit Windows, and says it can run through Wine on Linux or Mac and on ReactOS. It can also be installed and started from a USB memory stick. Anti-Twin does not search the Internet or FTP servers, excludes files larger than 2 GB from comparisons, and has no restore function for deleted files. The site says it was maintained until 2012 and still runs on Windows 10 and 11.

Spec sheet

Purpose
Anti-Twin searches a hard disk for duplicate or similar files and can send found files to the recycle bin or delete them.Read 8 Oct 2026 · antitwin.org
Founded
2003Read 28 Sep 2026 · antitwin.org
Deletion recovery
Anti-Twin has no restore function for deleted files; permanently deleted files cannot be restored through the program.Read 8 Oct 2026 · antitwin.org
Export
Search results can be exported as an Excel file even if Excel is not installed, and the site says OpenOffice users can use the export.Read 8 Oct 2026 · antitwin.org
File comparison
It can compare file content byte by byte and search for identical or similar file names.Read 8 Oct 2026 · antitwin.org
File size limit
Files larger than 2 GB are not included in comparisons.Read 8 Oct 2026 · antitwin.org
Folders and networks
It searches local drives, USB flash disks, memory cards, and shared network folders; it cannot search the Internet or FTP servers.Read 8 Oct 2026 · antitwin.org
Image comparison
Its pixel-based image comparison can find similar pictures, including images saved with different compression rates or file formats.Read 8 Oct 2026 · antitwin.org
Maintenance status
The site says Anti-Twin first appeared in 2003 and was maintained until 2012; it states the program still runs on Windows 10 and 11.Read 8 Oct 2026 · antitwin.org
Manual review
The site advises checking files selected by mass-selection functions before deletion and manually inspecting similar-image results.Read 8 Oct 2026 · antitwin.org
Portable use
The program can be installed on a USB memory stick and started from there.Read 8 Oct 2026 · antitwin.org
Similarity threshold
Binary content similarity can be searched with a minimum match as low as 60%, but the site says this takes much longer and is useful for only a few file types.Read 8 Oct 2026 · antitwin.org
Supported operating systems
The download page lists Windows 32-bit and 64-bit and says it also runs via Wine on Linux or Mac, and on ReactOS.Read 8 Oct 2026 · antitwin.org

Plans and prices

Anti-Twin Classic Free Free for private use since 2003 · freeware Read 8 Oct 2026 · antitwin.org

Every Anti-Twin plan and price →

Strong points and limits

Strong points

  • Compares names, contents, binary similarity, and images.
  • Searches local and shared network folders.
  • Can run from a USB memory stick.
  • Exports results as an Excel file.
  • Free for private use.

Limits

  • Does not search the Internet or FTP servers.
  • Files over 2 GB are excluded.
  • Deleted files cannot be restored through the program.
  • Maintained until 2012.

Who it suits

Anti-Twin suits people looking for duplicates across local, removable, or shared network storage, including similar images. Users who delete results should be prepared to review selections first, since the program cannot restore deleted files.

Verdict

Anti-Twin offers several ways to locate exact and similar files across a range of storage locations. Its age, file size limit, and lack of a restore function are important considerations before deleting results.

Where Specifiction places it

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