Est. 2012 · Boulder, CO · Free, take one

Pattern library

UI Patterns

A UI pattern library built for coding agents. 40 patterns, each shipping a copy-paste prompt that rebuilds it inside your own codebase — plus a live preview and the source behind it.

A blueprint drawing of interface parts: dialled gauges, dimensioned panels, and a grid of repeated tiles
fig. 4 — the parts bin.

Every pattern, three ways

Preview

The pattern running live in an isolated frame, in whichever theme you are reading in.

Source

Its markup, styles and behaviour, plus a single runnable file carrying its own palette.

Prompt

A written spec that rebuilds the pattern from scratch — including why each decision is the way it is. Paste it into Claude Code, Cursor, or any coding agent.

The prompts are the point. Each one is written to survive being handed to an agent with no other context: it names the surfaces the pattern belongs on, spells out the constraint that makes it work, and calls out the failure it exists to prevent. Nothing here is a dependency you install.

40 patterns
Data displayAdded Aug 11, 2026

Windowed schedule grid

Rows of resources against a fixed time window, where each block is sized by its overlap with the window rather than by its own duration.

schedule · timeline · grid · flexbox

Data displayAdded Aug 11, 2026

Benchmark progress bar

Places a raw figure on a scale of external benchmarks instead of printing it plain.

progress · benchmarks · css-only · data-viz

Data displayAdded Aug 11, 2026

Cross-highlight matrix

A two-axis lookup table with both headers sticky, hover lighting the full row and column at once, and a durable click-to-pin selection for touch.

table · matrix · sticky · accessibility

Data displayAdded Aug 11, 2026

Left-truncating paths

Shortens a long path by dropping whole segments from the left, because the tail is what tells two paths apart.

truncation · paths · text-overflow · breadcrumbs

Data displayUpdatedUpdated Aug 21, 2026

Shape-mark sequence

A sequence compressed into a row of small marks whose shape carries the state.

stepper · sparkline · series · truncation

Data displayAdded Aug 21, 2026

Linked month bars

A month-by-month volume timeline built from plain divs where every aggregate row links to the filtered view that produced it.

timeline · drill-down · css-only · data-viz

Data displayAdded Aug 21, 2026

Glass vial meter

A vertical potion-vial meter whose liquid fills a wide bulb first and then rises into a narrow neck — all CSS, no images.

meter · skeuomorphic · css-only · reduced-motion

Data displayAdded Sep 12, 2026

Partitioned stage bar

Progress for work with several possible endings, drawn as a census rather than a fraction.

progress · stacked-bar · batch · legend

Data displayAdded Sep 12, 2026

Term-by-term derivation

A computed figure shown with the audit trail behind it — the number is the product and the derivation is the receipt.

explainability · calculator · disclosure · formula

Data displayUpdatedUpdated Sep 12, 2026

Plan preview tree

A dry run shown as a before-and-after tree with counts now, after, and the difference.

dry-run · diff · tree · preview

Data displayAdded Sep 12, 2026

Uniform slot shell

One card shell many independent sources render through, where the shell does the capping.

dashboard · widgets · cards · empty-state

LayoutUpdatedUpdated Aug 11, 2026

Object-shaped cards

Where a record stands for a physical thing, the card is drawn as that thing — nine variations in pure gradients.

cards · css-only · gradients · variations

LayoutAdded Aug 11, 2026

Adaptive tile mosaic

A container with no artwork draws one from up to four member tiles, grid tracks following tile count.

css-grid · css-only · no-assets · cards

LayoutUpdatedUpdated Aug 11, 2026

Ground-scrimmed artwork

Text printed over unreviewed artwork, scrimmed to an alpha that can be written down rather than guessed.

layout · css-only · gradients · contrast

LayoutUpdatedUpdated Aug 21, 2026

Hairline stat strip

Stat tiles joined by hairlines that are grid gap, not borders.

stats · css-grid · css-only · hairline

LayoutAdded Aug 21, 2026

Annotated transcript

Conversation bubbles with a speaker-colored spine and a fixed metadata gutter.

conversation · gutter · status-roles · contrast

LayoutAdded Aug 21, 2026

Cork notice board

Pinned paper notes on a cork board where every texture is layered CSS gradients.

skeuomorphic · gradients · no-assets · cards

LayoutUpdatedUpdated Sep 12, 2026

Hotspot marker layer

Markers at percentage coordinates over a fixed-aspect picture, turning into a list when too narrow.

hotspots · pointer-events · aspect-ratio · container-query

LayoutAdded Sep 12, 2026

Line-art empty states

Inline drawings for empty surfaces stroked in the inherited text colour.

empty-state · svg · currentcolor · illustration

LayoutAdded Sep 12, 2026

Column-flow wall

Cards flowing down columns instead of across rows, with the reading-order cost stated plainly.

masonry · columns · break-inside · reading-order

InteractionAdded Aug 11, 2026

Scroll edge shadows

An inset shadow shown only on the edge that has more content behind it.

scrolling · affordance · lists · overflow

InteractionAdded Aug 11, 2026

Frozen-batch deck

A one-card-at-a-time review queue whose batch is snapshotted at mount.

queue · review-flow · animation · keyboard

InteractionUpdatedUpdated Aug 11, 2026

Controls beside the anchor

Per-card controls over a fully-linked card without nesting interactive elements in the anchor.

cards · accessibility · keyboard · focus-within

InteractionUpdatedUpdated Aug 11, 2026

Pluggable canvas visualizer

One canvas, a registry of draw modes, each mode owning its entire frame.

canvas · visualization · registry · animation

InteractionUpdatedUpdated Aug 21, 2026

Roving-grid board

A dense grid of state cells that is one tab stop with arrow-key navigation.

keyboard · roving-tabindex · accessibility · states

InteractionAdded Aug 21, 2026

Section rail

Sticky vertical rail on wide screens, wrapping tab row on narrow ones, from the same markup.

navigation · toc · responsive · aria-current

InteractionAdded Aug 21, 2026

Ledge-press buttons

Buttons on a solid ledge shadow that travel down onto it when pressed.

buttons · skeuomorphic · press · tokens

InteractionUpdatedUpdated Sep 12, 2026

Guarded control

A blocked control stays focusable, carries the reason as text, and refuses in its handler.

aria-disabled · disabled · preconditions · keyboard

InteractionUpdatedUpdated Sep 12, 2026

Polled job card

One card for every state a background job passes through.

progress · polling · background-job · indeterminate

InteractionAdded Sep 12, 2026

Entry-transform motion

FLIP-style motion between two rendered states when the old DOM is already gone.

animation · transitions · reflow · reduced-motion

InteractionUpdatedUpdated Sep 12, 2026

Slot-first picker

Assignment that starts at the destination slot, then narrows the catalogue.

assignment · picker · aria-pressed · filtering

FormsAdded Aug 28, 2026

Undo toast

A destructive action with no confirm dialog, held behind a toast and committed when it expires.

undo · toast · destructive · aria-live

FormsNewAdded Sep 28, 2026

Blast-radius confirm

A confirm dialog that names everything a delete cascades and blocks dismissal while it runs.

confirm-dialog · destructive · cascade · dialog-element

FormsUpdatedUpdated Aug 28, 2026

Batch action bar

A bar that exists only while something is selected, states the count in words, caps at five actions.

selection · bulk-actions · toolbar · checkbox

FormsAdded Sep 12, 2026

Filtered to zero

The three empty states a list actually has, written as three different screens.

empty-state · filter · search · zero-results

FormsAdded Sep 12, 2026

Parsed query chips

A search box that echoes back how it read the text as removable chips.

search · query-syntax · chips · facets

FormsAdded Sep 12, 2026

Compound-value picker

One grouped select whose value carries both the kind and the id.

select · optgroup · polymorphic · forms

ColorUpdatedUpdated Aug 11, 2026

Ground-referenced color

Colors solved against the page's own ground token so they invert correctly between themes.

color · contrast · color-mix · accessibility

ColorUpdatedUpdated Aug 21, 2026

Single-property color variants

One custom property carries the hue; border, fill, spine and dot derive from it.

color · color-mix · custom-properties · theming

ColorUpdatedUpdated Sep 12, 2026

Controls on an unknown fill

Opaque controls, a gradient-darkened fill, and a two-tone focus ring on a surface whose colour arrives from outside.

contrast · brand-color · focus-ring · opacity