The duplicate file finder Mac users actually trust
DuoBolt finds exact duplicate files on macOS by comparing every byte — not file names, sizes, or timestamps. A native Apple Silicon and Intel app powered by BLAKE3, with a clear review step before anything ever moves to the Trash.
Built for users who want precision, not guesswork
Most macOS duplicate finders flag candidates by name patterns, file size, or quick-and-dirty checksums — and quietly produce false positives on photo libraries, design exports, or backup folders. DuoBolt always runs full-content BLAKE3 hashing, so a duplicate group is mathematically guaranteed to contain identical files. You decide what to remove; the engine never deletes anything on its own.
Byte-for-byte matching
Every candidate is fully hashed with BLAKE3. Two files are flagged as duplicates only if their content matches exactly — never just because the names or sizes line up.
Native macOS app
Universal binary for Apple Silicon and Intel. Notarized, hardened-runtime, code-signed. No background daemons, no telemetry, no account required.
Safe deletion via Trash
Removed files always go to the macOS Trash. Nothing is wiped in place, so a bad call is one Cmd-Z away in Finder.
Drives, externals & shares
Scan internal SSDs, external USB and Thunderbolt drives, SD cards, and any SMB or AFP volume mounted in Finder — same engine, same accuracy.
How DuoBolt finds duplicates on macOS
Four steps from picking a folder to safely reclaiming gigabytes — fully offline, no account, no upload.
- Step
Pick scan roots
Drag any folder, mounted disk, or external drive into DuoBolt. Add as many roots as you want — they scan in parallel.
- Step
Scan with BLAKE3
DuoBolt prehashes head+tail bytes to skip non-matches, then fully hashes the rest with multi-core BLAKE3.
- Step
Review duplicate groups
Inspect each group with paths, sizes, and previews. Use bulk-select rules or pick files manually.
- Step
Send to Trash
Delete only what you confirm. Originals stay untouched and removed files remain restorable from the macOS Trash.
Mac duplicate finder FAQ
- Does DuoBolt for Mac work on Apple Silicon?
- Yes. DuoBolt ships as a universal binary that runs natively on Apple Silicon (M1, M2, M3, M4) and Intel Macs. BLAKE3 uses NEON acceleration on Apple Silicon for higher throughput.
- Which versions of macOS are supported?
- macOS 12 (Monterey) and newer. The app is notarized by Apple and runs with hardened runtime enabled.
- Will DuoBolt delete files automatically?
- No. DuoBolt never deletes anything without explicit confirmation. Every removal goes through the macOS Trash, so you can restore files from Finder if you change your mind.
- Can it scan duplicates across an external drive and my Mac at the same time?
- Yes. Add both as scan roots and DuoBolt will detect duplicates across them, so you can see whether copies on your external drive already exist on your Mac (or vice versa).
- Does DuoBolt detect similar photos or fuzzy matches?
- No. DuoBolt is an exact duplicate finder. Two files are reported as duplicates only when their full BLAKE3 hash matches — i.e., when they are byte-for-byte identical.
Keep exploring
DuoBolt Desktop guide
Full walkthrough of the macOS app: scan setup, filters, review, and deletion history.
Read morePerformance benchmarks
Real-world scan times against Czkawka, dupeGuru, and Gemini 2 on Apple Silicon.
Read moreExact duplicate file finder
Why DuoBolt only flags byte-for-byte matches — no name shortcuts, no fuzzy matching.
Read more