BlazeDiff is a high-performance diff ecosystem. Originally built in JavaScript as a pixel-perfect image comparison library that's now about 7x faster than pixelmatch. Now, BlazeDiff has evolved into a comprehensive suite of blazing-fast diff tools including image comparison, image diff analysis deterministically + agent-in-the-loop verdict, object diffing, perceptual quality metrics, framework-agnostic UI renderers, and React components for visualizing differences.
Available Packages
Core Libraries
- @blazediff/core-native - The fastest single-threaded image diff in the world (Rust + SIMD, 5.1-5.9x faster than odiff on 4K images)
- @blazediff/core-wasm - WebAssembly build of the same Rust algorithm (wasm32 + v128 SIMD, about 6.8x faster than pixelmatch). For browsers, edge runtimes, and any wasm host.
- @blazediff/core - Pixel-perfect image comparison (about 7x faster than pixelmatch)
- @blazediff/interpret-native - Native Rust structured interpretation of a diff: what changed in each region, where, and how much - not just which pixels differ
- @blazediff/object - High-performance object diffing with detailed change tracking
- @blazediff/ssim - SSIM, MS-SSIM, and Hitchhiker's SSIM for perceptual quality assessment
- @blazediff/ssim-native - Native Rust build of the same metrics plus perceptual SSIM (~15x faster than the JS port; ~4x for Hitchhiker's)
- @blazediff/gmsd - Gradient Magnitude Similarity Deviation metric
- @blazediff/milo-native - Native Rust MILO (Çoğalan et al. 2025), a learned perceptual metric that models visual masking. The authors' weights embedded, PyTorch parity, no PyTorch
- @blazediff/milo-wasm - WebAssembly build of the same metric for browsers, edge runtimes, and any wasm host
- @blazediff/codec-png-native - The
blazediff-png Rust PNG codec for Node.js through N-API: spng-parity decode, libdeflate encode
- @blazediff/codec-png-wasm - WebAssembly build of the same codec for browsers, edge runtimes, and any wasm host
Rust Crates
- blazediff - The Rust crate powering
@blazediff/core-native: block-based image diffing with SIMD (source)
- blazediff-png - From-scratch PNG codec in Rust, single-threaded and SIMD-first, with byte-exact decode parity to libspng and faster on every fixture. Powers
@blazediff/codec-png-native and @blazediff/codec-png-wasm (source)
- blazediff-ssim - SSIM, MS-SSIM and Hitchhiker's SSIM in Rust, dependency-free and SIMD-vectorised, held to the reference MATLAB scripts through Octave (source)
- blazediff-interpret - Structured region analysis for image diffs: classify what changed, not just where. Powers
@blazediff/interpret-native (source)
- blazediff-milo - MILO perceptual quality metric as a std-only SIMD CNN, multi-threaded, held to the authors' PyTorch outputs by test. Powers
@blazediff/milo-native and @blazediff/milo-wasm (source)
Python Packages
Command Line Tools
- @blazediff/cli - JS CLI with multiple algorithms (diff, GMSD, SSIM, MS-SSIM, Hitchhiker's SSIM)
- @blazediff/agent - Agentic visual regression. Auto-discovers routes, captures deterministic screenshots, and hands ambiguous diffs back to your coding agent (Claude Code, Cursor, Codex) to judge.
UI Components
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