axe-cuprite runs the axe-core accessibility engine against pages rendered in Capybara system/feature tests and exposes the results as RSpec matchers (be_axe_clean / be_accessible). Unlike Deque's official axe-core-capybara gem, it never touches Selenium-specific driver internals: axe is driven entirely through Capybara's driver-neutral JavaScript API, so it works with Cuprite (the Ferrum/CDP headless-Chrome driver) and any other real-browser driver. The headline use case is catching WCAG color-contrast failures in CI.