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React Native has no CSS box-shadow - iOS reads a separate shadowColor, shadowOffset, shadowOpacity, and shadowRadius, while Android ignores all of those and uses a single elevation number instead, so the same visual shadow needs two different sets of values to look right on both platforms.
Sliders for offset X/Y, opacity, radius, and elevation drive a live preview against a card mockup, then copy out as a ready StyleSheet.create() block with both platforms' properties already filled in.
Why elevation has its own slider
Elevation isn't derived from the offset, opacity, or radius sliders - Android approximates shadow depth from that single number alone, independent of the other values. That's why it's a separate control rather than something calculated automatically: getting Android to visually match iOS means tuning elevation by eye, not by formula.
What the preview does and doesn't tell you
The preview card renders a CSS box-shadow built from the same offset/opacity/radius/color values, as a quick approximation you can judge in the browser. It's a stand-in, not a validated render of either platform's actual shadow engine - treat it as a starting point and confirm the final look in a simulator or on-device.
Frequently asked questions
Will the same shadow look identical on iOS and Android?
Not exactly - iOS renders the shadow properties directly, while Android only has the elevation number to approximate the same depth. The two rendering paths don't guarantee a pixel match, so elevation is worth adjusting by eye against the iOS result rather than assuming a formula connects them.
Can I use negative offset values?
Yes - offset X and Y both range down to -25px, which shifts the shadow up or to the left of the element instead of down and to the right.
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