Argos vs BackstopJS

Argos is a visual testing platform that stores screenshots uploaded by a team's test suite, compares them across builds, and supports review of visual changes. Argos does not connect to applications to capture screenshots. It can also diff Markdown, JSON, HTML, CSS, JavaScript, XML, YAML, and plain text. Integrations include Playwright, Cypress, Storybook, WebdriverIO, its CLI, or any framework, alongside GitHub Actions and deployment providers such as Vercel, Netlify, and Cloudflare. Teams can connect GitHub, GitLab, Slack, Discord, and Microsoft Teams. For agent workflows, Argos offers a remote MCP server, CLI workflows, and a REST API for inspecting diffs, reviewing builds, collaborating, and deploying previews. The Hobby Plan is free, billed forever, and includes up to 5,000 screenshots with 30-day retention. Pro costs $100 a month, billed monthly based on usage, and includes 35,000 screenshots and one-year retention. Argos says its SDKs and platform are open source and MIT-licensed, and that it is SOC 2 Type II and GDPR compliant.

BackstopJS is a free, MIT-licensed tool for visual regression testing of web applications. It captures screenshots and compares them with reference images over time. An in-browser report shows reference, test and visual-difference views, with additional CLI and JUnit reports. BackstopJS supports Puppeteer and Playwright; Playwright can use Chromium, Firefox or WebKit. Scenarios can script clicks, scrolling, hovering, key presses and cookie state. Captures can cover a full document, viewport or selected DOM elements at configured viewport sizes. The documented workflow uses `backstop init`, `backstop test` and `backstop approve` to configure tests, compare captures and update references. Installation works globally or locally through npm, as a standalone CLI or from a Node.js app. CI reporting and integrations include Jenkins, Travis and gulp. Docker can reduce rendering differences, though Chrome Headless in Docker needs substantial memory.