BlazeDiff v2
Fastest image diff with native binary and SIMD
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Started with a pure JS implementation (still the fastest JS image diff), but wanted to push performance further. I rewrote the core in Rust to make it the fastest open-source single-threaded image diff. On 4K images (5600×3200): ~327ms vs odiff's ~1215ms. Binaries are ~3x smaller too (~700KB vs ~2MB). The core insight: make the cold pass smarter to make the hot pass do less work. Instead of simple pixel equality, the cold pass scans dynamic-sized blocks and marks "problematic" ones - blocks that might contain differences. The hot pass then only runs YIQ perceptual diff and antialiasing check on those problematic blocks, skipping everything else entirely. PNG I/O uses spng (C library) via Rust bindings. SIMD throughout - NEON on ARM, SSE4.1 on x86. Drop-in replacement for odiff with the same API.
HN · launched Dec 19, 2025 · 7 upvotes (top 64%) · 0 views
Niche: image processing and editing tools · 260 launches, 21 in the last 7 days ▼ -28% · Explore this niche →
Category and tags
- Horizontal
- Dev tools
- Developer
- Not AI
- Hobby / open-source project
Visit website ↗ Source listing ↗
More like this: all 260 launches in image processing and editing tools →
Could you build this?
No Achieving industry-leading image diff performance requires handwritten SIMD assembly/intrinsics, low-level memory layout tuning, and deep understanding of CPU vector extensions.
What it would actually take: The core must be written in Rust or C++ leveraging AVX2/AVX-512, NEON, and WASM SIMD instructions to parallelize per-pixel perceptual color difference algorithms (like anti-aliasing detection and CIELAB/YIQ deltas). It requires custom zero-allocation memory buffers, cache-aligned data structures, and rigorous bench-driven profiling against varying image dimensions. This demands specialized low-level systems programming and systems optimization knowledge.
Discussion
No comments on this launch.
Competitors
Other products that read as similar to this one : 451 launches clear the similarity bar, closest 8 shown.
Attention rank: #262 of 452 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).
Launched 46 days after the earliest competitor.
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