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No.192 · Pricing

Stack Pricing

Build your plan and watch it stack up. The base plan is the foundation; every add-on you switch on drops onto the pile as a block whose height is its share of the price, landing with a little give. Switch one off and it slides out while the blocks above settle into the gap.

The prompt

The design brief behind this component — reuse it to regenerate, remix, or explain it.

Build an add-on pricing configurator with a physical stack that shows what you're paying for. Props: base ({ name, note, price }), addons ({ id, name, note, price }), initial ids, yearlyOff (e.g. 0.2), currency. Left: "Build your plan", a Monthly / Yearly radiogroup (yearly shows the discount), the base plan as a fixed row, and each add-on as a row — a colour key, name and note, its price, and a native checkbox styled as a switch (role=switch, labelled with the name and price). Add-on colours are categorical slots 1–5 in fixed order (blue, orange, aqua, yellow, magenta), stepped for Night; the key dims when an add-on is off. Right: the total in large tabular figures, easing to its new value over 420ms (ease-out cubic), with "/ month" and either "Billed yearly · you save OMR …" or the yearly figure. Below it, the stack: the base block at the bottom (solid ink) and one block per active add-on in the order they were switched on. Each block's height is its price × 7.2px (× the discount when yearly) with 3px between blocks, and it is a tint of its colour (24% into the surface, 30% on Night) with a 5px solid stripe on its left. Labels stay in ink and muted text, never the series colour. Switching an add-on on drops its block from 9rem above, through clear space the pile keeps above the stack and clips: an ease-in fall, a 0.82 vertical squash on landing, then an overshoot settle (620ms). Switching one off slides its block out to the right with a slight tilt and fade (260ms) before removing it, and the blocks above slide down into the gap (bottom 520ms with overshoot). Yearly resizes every block (height 420ms). A CTA counts the pieces. Under 720px the two halves stack. Paper and Night; reduced motion removes every animation.

Notes

Interaction
Switch add-ons on and off to drop and remove blocks; toggle Monthly and Yearly to resize the stack.
Motion
Drop 620ms (fall, squash, settle); remove 260ms slide-out; settle 520ms overshoot; yearly resize 420ms; total eases over 420ms.
Accessibility
Add-ons are native checkboxes with role=switch and a label that includes the price; billing is a radiogroup; the total is a polite live region; the stack is decorative and aria-hidden. Reduced motion shows changes at once.
Responsive
Two columns from 720px; one column below, with the stack under the list.
On touch
Whole rows are labels, so the switch can be toggled from anywhere on the row.

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