Directory
Chromatic
Visual regression testing
Free tier + paidLibraries & build toolingchromatic.com
What it is
A cloud service from the Storybook team that screenshots every story on each commit and flags pixel differences for review. It adds cross-browser testing, hosted Storybook publishing and PR review workflows. The free tier covers 5,000 snapshots per month.
Why it earns a slot
Unit tests do not catch a CSS change that shifts every button four pixels. Chromatic turns 'did this refactor break the UI' into a diff you approve, which matters most when an agent edits shared styles.
Know before you commit
Requires Storybook first. Snapshot counts climb fast with many stories and browsers, so the jump from free to the $179/mo Starter plan arrives sooner than expected.
Getting started
npm install --save-dev chromatic
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