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Dup Detector

dupdetector.com

Free plan WindowsmacOSLinux
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Spec score 7.6 #16 of 38 in Duplicate File Finders

What it is

Dup Detector is a free, open-source desktop application for finding duplicate files and reclaiming storage space. It runs on Linux, macOS, and Windows. Smart hashing compares file sizes first, then partial content, and performs full content hashing when needed. The maker says smart hashing can scan 10,000 or more files per second. Multithreaded scanning is supported, and the app describes its memory footprint as minimal. Dup Detector identifies duplicates but does not remove them automatically, so users decide which files to keep or delete. The maker says the code is fully open source and welcomes inspection and contributions. It states that the app has no analytics, telemetry, or data collection. The Free plan costs nothing, is available forever, and includes cross-platform use. GitHub issues and Discord provide support and feedback channels.

Spec sheet

Purpose
Dup Detector is a free, open source desktop app for detecting duplicate files and reclaiming drive space.Read 11 Oct 2026 · dupdetector.com
Intended users
The maker describes Dup Detector as a simple tool for finding duplicates and reclaiming storage space.Read 11 Oct 2026 · dupdetector.com
Integrations
The maker page links to GitHub and Discord; it does not state that the app integrates with other software.Read 11 Oct 2026 · dupdetector.com
Privacy
The maker says the app has no analytics, telemetry, or data collection.Read 11 Oct 2026 · dupdetector.com
Support
The maker page offers a GitHub issue link and a Discord community for help and feedback.Read 11 Oct 2026 · dupdetector.com
Deletion control
The app identifies duplicates but does not automatically delete them; users choose what to keep or remove.Read 11 Oct 2026 · dupdetector.com
Matching
Smart hashing compares file sizes first, then partial content, and fully hashes files when necessary.Read 11 Oct 2026 · dupdetector.com
Open source
The maker says Dup Detector is 100% open source and invites users to inspect the code and contribute.Read 11 Oct 2026 · dupdetector.com
Performance
The maker says the app scans 10,000 or more files per second using smart hashing.Read 11 Oct 2026 · dupdetector.com
Scanning
The app supports multithreaded scanning and describes its memory footprint as minimal.Read 11 Oct 2026 · dupdetector.com

Plans and prices

Free Free Free forever · macOS, Windows & Linux · duplicates are not automatically deleted Read 11 Oct 2026 · dupdetector.com

Every Dup Detector plan and price →

Strong points and limits

Strong points

  • Free forever at free
  • Works on Linux, macOS, and Windows
  • Uses staged hashing to compare files
  • Supports multithreaded scanning
  • No analytics, telemetry, or data collection

Limits

  • Duplicates are not deleted automatically
  • No separate free trial is offered
  • Users must choose which files to remove

Who it suits

It suits anyone who wants a simple desktop utility for locating duplicate files on Linux, macOS, or Windows. Users who want deletion decisions to remain manual may prefer its approach.

Verdict

Dup Detector focuses on duplicate-file discovery with staged hashing and manual deletion control. Its open-source, cross-platform, data-collection-free design fits straightforward storage cleanup.

Where Specifiction places it

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