Wonder at what distance your device is retina? Just run this app! If the retina distance is less than the typical viewing distance then your display is retina. You can calculate retina distance and PPI for any device. Notes: - Retina is the distance at which the pixels are so small that they are no longer individually visible. - All displays are retina given enough distance. Therefore what really matters is actual viewing distance. - The calculation uses a value of 60 pixels per degree (PPD) fo