What is the difference between Selenium and Zelenium?

Selenium is a popular framework for browser automation, supporting most programming languages and browsers. It emulates user actions such as clicks and text input.

Zelenium is an extension for Selenium, specializing in visual regression testing. It compares screenshots of web pages with reference images, detecting visual changes. Zelenium can ignore minor visual deviations (anti-aliasing) and dynamic elements (e.g., scrolling).

Characteristic	Selenium	Zelenium
Main function	Automating actions in the browser (clicks, input)	Visual regression testing
What it tests	Behavior and functionality of web applications	Appearance and layout of web applications
How it works	Interacts with DOM elements	Compares screenshots
Dependency	Self-sufficient framework	Depends on Selenium
Typical tasks	Functional testing, E2E tests	Layout verification, visual bug detection

In most cases, Selenium is used for automating functional testing, while Zelenium integrates with it or is used in parallel for visual verification.