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DuoBolt

Overview

DuoBolt finds two different things.

Duplicate files Byte-for-byte identical copies. Verified by a full BLAKE3 hash — there is a right answer, and DuoBolt gives it.
Similar photos Shots that look alike. Bursts, exports, re-saves. DuoBolt shows its reasoning and leaves the call to you.

Everything else — reviewing, removing, restoring — is shared between the two.

Start here

Section titled “Start here”
Installation macOS and Windows: requirements, install, uninstall
Desktop Guide The app end to end: pick folders, scan, review, clean

How duplicate detection works

Section titled “How duplicate detection works”

Size first, then a prehash

Files are partitioned by size first, then filtered by a head-and-tail prehash. A file with no possible partner is never read in full.

Every match is confirmed

Anything reported as a duplicate has been verified by a full-content BLAKE3 hash. Names, dates and folders play no part in it.

Some folders are off the table

Protected folders make files unselectable — the checkbox refuses rather than warning you after the fact.

Removing files

Section titled “Removing files”

The five operations, what each one costs you, and how to undo them.

The five operations Trash, delete, archive, copy, clone — and which are reversible
Review Selection The screen between marking files and removing them
Protected folders Folders that can never lose a file
History and restore Every scan and every operation written down, most of them reversible

Reference

Section titled “Reference”
Core Concepts The detection pipeline, stage by stage
BLAKE3 in DuoBolt Why this hash, and what it guarantees
Performance Benchmarks Measured against Czkawka, dupeGuru, and Gemini 2
DuoBolt for NAS Network volumes, caching, and what to exclude
KB vs KiB — File Size Units Why DuoBolt reports KiB, MiB, and GiB
FAQ Hashing, safety, NAS, APFS clones, performance
Changelog Release notes and version history