Open Source Visual Testing Software

Visual Testing tools detect unintended changes in user interfaces by comparing screenshots of web pages and components. These tools identify visual regressions that traditional functional tests miss, ensuring that layout and styling remain consistent across different browser versions. This type of software is for frontend developers and quality assurance engineers who need to verify UI stability. Self-hosting these apps allows teams to store sensitive interface snapshots on private servers and integrate automated image comparisons directly into internal continuous integration pipelines.

This page lists 3 open source tools in the Visual Testing category. The most popular are LostPixel, Hercules and Argos. Most use the MIT or AGPL-3.0 license, and 3 offer an official Docker image.