odiff
The odiff project provides an SIMD-first image comparison library with a Node.js API.
About odiff
odiff is a pixel-by-pixel image comparison library and command-line tool that finds visual differences between two similar images such as screenshots, photos and AI-generated images. It is written in Zig with SIMD optimizations for SSE2, AVX2, AVX512 and NEON, and provides a Node.js binding through odiff-bin. It offers a server mode using a readline stdio protocol with JSON messages to reduce process startup cost for repeated comparisons. Diff output files are limited to .png format.
Pricing is not clearly stated.
Key features
- Cross-format comparison, such as .jpg vs .png without problems
- Supports .png, .jpeg, .jpg, .webp and .tiff inputs
- Supports comparison of images with different layouts
- Anti-aliasing detection
- Ignoring regions
- Integrations for Playwright via playwright-odiff and Cypress via cypress-odiff
Watch out for
- Without an output path, the diff displays inline only in terminals supporting the kitty graphics protocol
odiff at a glance
- Category
- Online Tools › Image Tools
- Type
- Open-source project
- Pricing
- Not confirmed. Check the site
- Details verified
- Oct 22, 2026 · Official source
- Open source
- Yes · Source code
- Language
- English
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
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