Head-to-Head: BackstopJS vs Pixelmatch Analysis

backstopjs

v6.3.22(1 day ago)

This package is actively maintained.Types definitions are provided via a separate npm package: @types/backstopjsNumber of direct dependencies: 18Monthly npm downloads

BackstopJS is a powerful visual regression testing tool for web applications. It allows you to compare screenshots of different versions of your application to identify any visual changes or regressions. With BackstopJS, you can define scenarios that capture screenshots of specific pages or components, and then compare them against a baseline to detect any visual discrepancies.

Alternatives:
puppeteer+
playwright+
cypress+
webdriverio+
testcafe+
nightwatch+
taiko+
selenium-webdriver+
jest-puppeteer+
protractor+

Tags: javascripttestingvisual-regressionwebscreenshot

pixelmatch

v5.3.0(almost 2 years ago)

This package was last published over a year ago. It may not be actively maintained.Types definitions are provided via a separate npm package: @types/pixelmatchNumber of direct dependencies: 1Monthly npm downloads

Pixelmatch is a lightweight and fast JavaScript library for image comparison and pixel-level image diffing. It is commonly used in automated visual regression testing to detect visual differences between images. Pixelmatch provides an easy-to-use API for comparing images pixel by pixel and generating diff images that highlight the differences.

Alternatives:
resemblejs+
looks-same+
odiff-bin+
blink-diff+
image-diff+
jest-image-snapshot+
puppeteer-screenshot-tester+
cypress-image-snapshot+
visual-regression-tracker+
reg-cli+

Tags: javascriptimagecomparisonvisual-regression-testingpixel-level-diffing

Fight!

Functionality

BackstopJS is a visual regression testing tool that captures screenshots of web pages and compares them to detect any visual changes. It provides a comprehensive set of features for visual testing, including automated testing, regression testing, and visual diffing. Pixelmatch, on the other hand, is a lightweight image comparison library specifically designed for pixel-level image diffing. It is more focused on providing a low-level API for image comparison and does not have the same level of automation and testing capabilities as BackstopJS.

Integration

BackstopJS is primarily designed to work with web applications and can be easily integrated into existing testing frameworks like Mocha or Jasmine. It provides a command-line interface and supports various testing scenarios. Pixelmatch, on the other hand, is a standalone library that can be used in any JavaScript project. It does not have built-in integration with testing frameworks and requires manual implementation for integration into testing workflows.

Performance

Pixelmatch is a lightweight library optimized for performance and speed. It uses an efficient pixel-by-pixel comparison algorithm and is suitable for comparing small images or individual pixels. BackstopJS, on the other hand, is a more comprehensive tool that captures and compares full web page screenshots, which can be slower and resource-intensive, especially for larger web pages.

Community and Support

Both BackstopJS and Pixelmatch have active communities and are well-maintained. BackstopJS has a larger user base and a more established community, which means it has more resources, documentation, and community support available. Pixelmatch, while less popular, still has a dedicated user base and provides sufficient documentation and support for its specific use case.

Ease of Use

BackstopJS provides a higher-level API and a command-line interface, making it easier to set up and use for visual regression testing. It offers configuration options and presets to streamline the testing process. Pixelmatch, being a lower-level library, requires more manual implementation and customization for image comparison tasks. It provides a simple API but may require additional code to handle image loading and other related tasks.