Freedom251 › Duplicate File Finders
Dup Detector
What Dup Detector is
Dup Detector is a free, open source desktop app for locating duplicate files so you can decide how to reclaim drive space. It runs on Linux, macOS, and Windows. Its matching process starts by comparing file sizes, then checks partial content, and fully hashes files when needed. This staged approach lets it identify matches using more detailed comparisons as necessary.
The app supports multithreaded scanning and describes its memory footprint as minimal. Its maker says smart hashing scans 10,000 or more files per second. Dup Detector reports which files are duplicates but does not delete them automatically; you choose what to keep and what to remove. That keeps the final cleanup decision in your hands.
The maker describes the software as 100% open source, invites people to inspect its code and contribute, and says the app collects no analytics, telemetry, or other data. GitHub and Discord links are provided for help and feedback. The listed Free plan costs nothing and is described as free forever, with Linux, macOS, and Windows support. Dup Detector does not state integrations with other software; its maker page links to GitHub and Discord for community interaction.
Who it suits
Dup Detector suits people who want to find duplicate files and reclaim storage while choosing manually which copies to remove. It is a fit for Linux, macOS, and Windows users who value open source software and the maker’s stated lack of analytics, telemetry, or data collection.
What it does well
- Free forever on Linux, macOS, and Windows.
- Compares size, partial content, and full content hashes.
- Supports multithreaded scanning.
- Maker says smart hashing scans 10,000 or more files per second.
- Leaves deletion choices to the user.
- Maker says it has no analytics, telemetry, or data collection.
What to know first
- Does not automatically delete duplicate files.
- Desktop platforms are Linux, macOS, and Windows.
- No integrations with other software are stated.
Limits
The app identifies duplicates but does not delete them automatically. The listed platforms are Linux, macOS, and Windows.
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Free | Free forever · macOS, Windows & Linux · duplicates are not automatically deleted | Free |
As dupdetector.com lists them, read 11 Oct 2026. The maker's own page has the final word.
Getting started
- Visit dupdetector.com.
- Choose the download for Linux, macOS, or Windows.
- Install and open the desktop app.
- Run a scan to identify duplicate files.
- Review the matches and choose which files to keep or remove.
- Use the GitHub issue link or Discord community for help or feedback.
Verdict
Pick Dup Detector if you want a free, open source desktop tool to find duplicates and make your own deletion choices. Its staged matching and multithreaded scanning address file discovery across three desktop platforms. Look elsewhere if you need duplicates removed automatically or depend on stated integrations with other software.
Questions
How much does Dup Detector cost?
Its Free plan costs nothing and is described as free forever.
Is there a free trial?
No free trial is listed; the app is free forever.
Which platforms does Dup Detector support?
Linux, macOS, and Windows.
Is Dup Detector open source?
Yes. Its maker describes it as 100% open source and invites people to inspect the code and contribute.
Does Dup Detector delete duplicate files automatically?
No. It identifies duplicates, and you decide what to keep or remove.
How can I get help or share feedback?
The maker page links to a GitHub issue page and a Discord community.
Facts from Dup Detector's own pages
- Deletion control
- The app identifies duplicates but does not automatically delete them; users choose what to keep or remove. · dupdetector.com, 11 Oct 2026
- Integrations
- The maker page links to GitHub and Discord; it does not state that the app integrates with other software. · dupdetector.com, 11 Oct 2026
- Intended users
- The maker describes Dup Detector as a simple tool for finding duplicates and reclaiming storage space. · dupdetector.com, 11 Oct 2026
- Matching
- Smart hashing compares file sizes first, then partial content, and fully hashes files when necessary. · dupdetector.com, 11 Oct 2026
- Open source
- The maker says Dup Detector is 100% open source and invites users to inspect the code and contribute. · dupdetector.com, 11 Oct 2026
- Performance
- The maker says the app scans 10,000 or more files per second using smart hashing. · dupdetector.com, 11 Oct 2026
- Privacy
- The maker says the app has no analytics, telemetry, or data collection. · dupdetector.com, 11 Oct 2026
- Purpose
- Dup Detector is a free, open source desktop app for detecting duplicate files and reclaiming drive space. · dupdetector.com, 11 Oct 2026
- Scanning
- The app supports multithreaded scanning and describes its memory footprint as minimal. · dupdetector.com, 11 Oct 2026
- Support
- The maker page offers a GitHub issue link and a Discord community for help and feedback. · dupdetector.com, 11 Oct 2026
Where Dup Detector stands on Freedom251
- Duplicate File Finders#6 of 38