Keypad Theme Wave
The theme step of a calculator app's onboarding: a preview card of the calculator (display, a 4 × 5 keypad of round keys and the app's wordmark), a strip of striped swatches whose centred, white-framed swatch is the selection, "Customize your calculator" and a Continue button. Picking a theme sends it across the preview as a wave: the card's colour is revealed by a circle from the corner the new swatch came from, and key by key, on diagonals from that corner, each key drains to a hollow ring and then blooms full with the new colours. Ten palettes, all drawn in code; the preview's keys work as a tiny calculator.
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React Native · Expo SDK 52+, TypeScript
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