Screen Size Checker

Responsive-design toolkit — detect screen size, resolution, PPI and aspect ratio with device databases

Webfreeglobal

A web-based toolkit, Screen Size Checker helps developers and designers avoid guessing device dimensions when building responsive layouts by detecting screen size, resolution, pixel density and aspect ratio in real time. It includes PPI and aspect-ratio calculators, searchable device references for iPhone, iPad and Android, a built-in responsive tester and practical guides on viewport behavior and media queries.

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