You want a desktop app
DuoBolt Desktop gives you a visual interface to review, preview, and safely delete duplicates via the system Trash. No accidental deletions.
DuoBolt vs Czkawka — Speed & Feature Comparison
Czkawka is a popular open-source duplicate finder. DuoBolt consistently outpaces it on large and complex datasets, while adding a polished desktop interface with safe deletion. Here’s how they compare on real-world data.
Benchmark Results
Section titled “Benchmark Results”All tests ran on Apple Silicon M1 Pro, macOS 26.1, with cleared caches and back-to-back execution. Lower times are better.
| Dataset | DuoBolt | Czkawka | DuoBolt advantage |
|---|---|---|---|
| Design Projects (13.17 GB) | 1s | 1s | Tie |
| Codebase (37.92 GB) | 3s | 4s | 1.3× faster |
| Codebase + Library (large) | 24s | 55s | 2.3× faster |
| NAS Cold — 1.01 TB | 64s | 85s | 1.3× faster |
| NAS Warm — 1.01 TB | 20s | 24s | 1.2× faster |
Key takeaway: On small, uniform datasets both tools tie. The gap widens significantly as file count, diversity, and dataset size increase — DuoBolt’s multi-core BLAKE3 engine scales better.
Feature Comparison
Section titled “Feature Comparison”| Feature | DuoBolt Desktop | DuoBolt CLI | Czkawka |
|---|---|---|---|
| Platforms | macOS, Windows | macOS, Windows, Linux | macOS, Windows, Linux |
| Interface | Desktop GUI | Terminal | GUI + Terminal |
| Price | $29.99 one-time | Free | Free (open source) |
| Hashing | BLAKE3 | BLAKE3 | Multiple (SHA-256, Blake3, etc.) |
| Safe deletion | Via system Trash | No deletion | Direct delete |
| Output formats | Visual UI | JSON, CSV, TXT | Various |
| NAS / network drives | Yes | Yes | Yes |
| Automation / scripting | — | Yes | Yes |
| Deletion history & restore | Yes | — | — |
When to Choose DuoBolt
Section titled “When to Choose DuoBolt”You work with large datasets
On datasets above 30 GB — especially NAS volumes — DuoBolt’s parallel BLAKE3 engine pulls ahead of Czkawka by up to 2.3×.
You need safe automation
DuoBolt CLI never modifies files. It scans and outputs JSON/CSV/TXT — ideal for pipelines where you want zero risk of data loss.
When to Choose Czkawka
Section titled “When to Choose Czkawka”- You need a free, open-source tool with no budget constraints
- You work primarily on Linux
- You prefer a tool with a larger community and public issue tracker
- Your datasets are small (under 15 GB) where both tools perform equally
Why DuoBolt Is Faster on Large Datasets
Section titled “Why DuoBolt Is Faster on Large Datasets”DuoBolt’s performance advantage comes from three architectural decisions that Czkawka doesn’t fully replicate:
- Per-root parallelism — DuoBolt keeps all CPU cores busy simultaneously across multiple scan roots, rather than processing sequentially
- Streaming I/O — chunked reads overlap disk access with hashing, so CPUs never wait for data on slow or network drives
- Smart prehashing — a head+tail partial hash filters candidates before full BLAKE3 hashing, drastically reducing unnecessary I/O on large datasets
Related
Section titled “Related”Full Benchmark Results
See all five datasets compared against Czkawka, dupeGuru, and Gemini 2.
Exact duplicate file finder
Why DuoBolt only flags byte-for-byte matches — no name shortcuts, no fuzzy matching, no false positives.
Download DuoBolt
Free CLI for macOS, Windows, and Linux. Desktop app for macOS and Windows.