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Dup Detector

Dup Detector is a free, open-source desktop app for finding duplicate files and reclaiming drive space.

Place
#20 of 38
Score
5.9
Dup Detector's website

What Dup Detector is

Dup Detector is a free, open-source desktop app for finding duplicate files and reclaiming drive space. It compares file sizes, then partial content, and uses full content hashing when needed to identify matches. The app supports multithreaded scanning and describes its memory footprint as minimal; its maker says smart hashing can scan 10,000 or more files per second. Dup Detector flags duplicates but does not remove them automatically, leaving you to choose which files to keep or delete. The maker says the code is open for inspection and contributions, and that the app has no analytics, telemetry, or data collection. It runs on Linux, macOS, and Windows. GitHub and Discord links are offered for help and feedback. The listed Free plan costs nothing, with no separate free trial.

Good

  • Compares file size, partial content, and full hashes.
  • Supports multithreaded scanning.
  • Available for Linux, macOS, and Windows.
  • Maker says it collects no data.

Watch out

  • Does not automatically delete duplicates.
  • No separate free trial is listed.

Who it suits

Dup Detector suits people who want to locate duplicate files and decide themselves what to remove. Its Linux, macOS, and Windows support makes it relevant across those desktop platforms.

Verdict

Dup Detector offers file matching and user-controlled deletion at no charge. It is a fit if you want to review duplicates yourself rather than have the app remove them.

Plans and prices

From Dup Detector's own pricing page, checked 11 Oct 2026.

All about pricing
PlanPriceWhat it gives you
FreeFreeFree forever · macOS, Windows & Linux · duplicates are not automatically deleted

The facts

Each one read from Dup Detector's own pages, with the date it was checked.

What it does

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

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