The structural similarity (SSIM) index is a method for measuring the similarity between two images. The SSIM index is a full reference metric; in other words, the measuring of image quality based on an initial uncompressed or distortion-free image as reference. SSIM is designed to improve on traditional methods like peak signal-to-noise ratio (PSNR) and mean squared error (MSE), which have proven to be inconsistent with human eye perception.
Image structural similarity (SSIM). In TypeScript/JavaScript. For browser/server.
JavaScript implementation of the SSIM algorithm
Fast single-threaded SSIM (Structural Similarity Index) metric for CI visual testing
TypeScript parsers for IATA SSIM (Standard Schedules Information Manual) data formats. Currently implements Chapter 7 — Schedule Data Set (.ssim files). Zero dependencies; works in Node and browsers.
WebAssembly library for real-time image frame comparison (SSIM/PSNR/MSE)
An image diffing library using FFmpeg. Creates an image showing perceptual differences and returns SSIM data.
CLI Tool for comparing images using the SSIM algorithm.
Image multi-scale structural similarity (MS-SSIM). In TypeScript/JavaScript. For browser/server.
Checks if file is a SSIM file.
Fast SSIM for single-channel greyscale images. Zero dependencies.
SSIM to GTFS conversion tool
Content-aware, device-adaptive image optimizer for React + Vite. Auto-converts to AVIF/WebP/JPEG with SSIM auto-tune, face detection, SVGO, and device-tier delivery. Built by @ezitounioussama at gotodev.ma.
Node module to find PSNR and SSIM of videos and images
Parses Standard Schedules Information Manual (SSIM) file to JSON.
Get the structural similarity between two images.
jpeg-recompress imagemin plugin
cwebp wrapper that makes it seamlessly available as a local dependency
Structural Similarity Index Measure
Core matcher logic for visual regression testing with blazediff
Bun test matcher for visual regression testing with blazediff
This package provide image scoring functions.
High-performance image diffing for Node.js - Native bindings to Honeydiff Rust library
An intelligent visual discrepancy and layout feedback engine for AI Coding Agents.
Measures the structual similarity between images using the SSIM algorithm.
Fast image quality assessment library (SSIM, MS-SSIM, PSNR, MSE) ported from Tom Distler's C implementation
A high-performance IATA SSIM (Standard Schedules Information Manual) parser. Parses SSIM files into Polars DataFrames or exports to CSV/Parquet.
GAF optimization pipeline — iterative denoising distillation
Internal core library for rustyssim. Not intended for direct use — use the rustyssim crate or python package instead.
Tool that measures structural similarity between images using a multi-scale variant of the SSIM algorithm.
Library that measures structural similarity between images using a multi-scale variant of the SSIM algorithm.
Video quality assessment and objective metrics for OxiMedia
Library and CLI for converting DOCX files to PDF, matching Microsoft Word's output as closely as possible
Image comparison library based upon the image crate. Currently it provides SSIM and RMS for comparing grayscale and rgb images, a cool hybrid compare as well as several grayscale histogram distance metrics. All with a friendly license.
A single, ergonomic API over the patchwork of visual quality assessment metrics in the Rust ecosystem.
Rust bindings for SVT-AV1
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