Viewport Checker
Use this reference to choose viewport ranges for responsive QA, then open Sizzy to test the same page across real device sizes at once.
Small phones
Stress-test dense controls, text wrapping, dialogs, and fixed-position UI.
Modern phones
Check the default mobile experience and any card, nav, or form density changes.
Large phones and small tablets
Watch for awkward intermediate layouts before tablet styles take over.
Tablet and desktop handoff
Confirm columns, sidebars, and nav transformations happen cleanly.
Responsive QA checklist
Start with the narrowest supported mobile width and expand until the layout breaks.
Check common device-width clusters instead of testing only arbitrary breakpoints.
Validate navigation, sticky elements, forms, dialogs, and horizontal overflow at each range.
Repeat the pass with realistic content lengths, logged-in states, and browser chrome assumptions.
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