Dup Detector review
A privacy-focused, cross-platform duplicate finder for straightforward manual cleanup.
Reviewed by iTechGuides Editors · Editorial team · Updated Sep 2026
Dup Detector is a free, open-source desktop application for finding duplicate files and reclaiming storage space. It runs natively on macOS, Windows, and Linux, making it suitable for users who want the same basic scanning approach across major desktop operating systems. Its focus is identification rather than automated cleanup: Dup Detector locates duplicate files, while the user decides which copies to keep or remove. That approach fits privacy-conscious users who prefer a simple, review-first workflow.
The product uses Rust-based, multithreaded scanning and a staged hashing process. It compares file sizes and partial content before performing full hashing when necessary to confirm duplicates. This design gives the scanner more than a basic filename comparison and is intended to reduce unnecessary full-file processing. The open-source codebase also supports a more transparent product model, while the website states that Dup Detector collects no analytics, telemetry, or data. There are no paid tiers described, so the product remains focused on its free desktop offering rather than separating capabilities across subscription plans.
Dup Detector is a good choice for people who need cross-platform duplicate identification without automatic deletion or data collection. Its narrow scope can be an advantage when users want to review results themselves, but it is less suitable for anyone seeking an automated duplicate-management workflow. Cleanup remains a manual decision after scanning, and full hashing can still be needed for confirmation in some cases. Choose Dup Detector for straightforward, privacy-oriented scanning; consider another tool if automatic removal or broader file-management controls are central to the workflow.
Dup Detector pros and cons
- Where it wins
- Open-source applications for macOS, Windows, and Linux
- Multithreaded scanning with size and partial-content hashing
- No analytics, telemetry, or data collection according to the website
- Where it doesn't
- Does not automatically delete or manage duplicate files
- Users must decide which duplicate files to keep or remove
- Full hashing may be required to confirm some duplicate matches
Dup Detector fact sheet, pricing and score →
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