AntJanus®

Pattern library40 patterns · 5 categories · 0 dependencies

UI Patterns40

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

Every pattern, three ways

01

Preview

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

02

Source

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

03

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.

All patterns

40 patterns
01
Data displayAdded 2026-08-11

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
02
Data displayAdded 2026-08-11

Benchmark progress bar

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

  • progress
  • benchmarks
  • css-only
  • data-viz
03
Data displayAdded 2026-08-11

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
04
Data displayAdded 2026-08-11

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
05
Data displayUpdatedAdded 2026-08-21

Shape-mark sequence

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

  • stepper
  • sparkline
  • series
  • truncation
06
Data displayAdded 2026-08-21

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
07
Data displayAdded 2026-08-21

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
08
Data displayAdded 2026-09-12

Partitioned stage bar

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

  • progress
  • stacked-bar
  • batch
  • legend
09
Data displayAdded 2026-09-12

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
10
Data displayUpdatedAdded 2026-09-12

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
11
Data displayAdded 2026-09-12

Uniform slot shell

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

  • dashboard
  • widgets
  • cards
  • empty-state
12
LayoutUpdatedAdded 2026-08-11

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
13
LayoutAdded 2026-08-11

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
14
LayoutUpdatedAdded 2026-08-11

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
15
LayoutUpdatedAdded 2026-08-21

Hairline stat strip

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

Good for summary strip at the top of a detail page, dashboard KPI row, account usage overview

  • stats
  • css-grid
  • css-only
  • hairline
16
LayoutAdded 2026-08-21

Annotated transcript

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

  • conversation
  • gutter
  • status-roles
  • contrast
17
LayoutAdded 2026-08-21

Cork notice board

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

  • skeuomorphic
  • gradients
  • no-assets
  • cards
18
LayoutUpdatedAdded 2026-09-12

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
19
LayoutAdded 2026-09-12

Line-art empty states

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

  • empty-state
  • svg
  • currentcolor
  • illustration
20
LayoutAdded 2026-09-12

Column-flow wall

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

  • masonry
  • columns
  • break-inside
  • reading-order
21
InteractionAdded 2026-08-11

Scroll edge shadows

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

  • scrolling
  • affordance
  • lists
  • overflow
22
InteractionAdded 2026-08-11

Frozen-batch deck

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

  • queue
  • review-flow
  • animation
  • keyboard
23
InteractionUpdatedAdded 2026-08-11

Controls beside the anchor

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

  • cards
  • accessibility
  • keyboard
  • focus-within
24
InteractionUpdatedAdded 2026-08-11

Pluggable canvas visualizer

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

  • canvas
  • visualization
  • registry
  • animation
25
InteractionUpdatedAdded 2026-08-21

Roving-grid board

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

  • keyboard
  • roving-tabindex
  • accessibility
  • states
26
InteractionAdded 2026-08-21

Section rail

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

  • navigation
  • toc
  • responsive
  • aria-current
27
InteractionAdded 2026-08-21

Ledge-press buttons

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

  • buttons
  • skeuomorphic
  • press
  • tokens
28
InteractionUpdatedAdded 2026-09-12

Guarded control

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

  • aria-disabled
  • disabled
  • preconditions
  • keyboard
29
InteractionUpdatedAdded 2026-09-12

Polled job card

One card for every state a background job passes through.

  • progress
  • polling
  • background-job
  • indeterminate
30
InteractionAdded 2026-09-12

Entry-transform motion

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

  • animation
  • transitions
  • reflow
  • reduced-motion
31
InteractionUpdatedAdded 2026-09-12

Slot-first picker

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

  • assignment
  • picker
  • aria-pressed
  • filtering
32
FormsAdded 2026-08-28

Undo toast

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

  • undo
  • toast
  • destructive
  • aria-live
33
FormsNewAdded 2026-09-28

Blast-radius confirm

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

  • confirm-dialog
  • destructive
  • cascade
  • dialog-element
34
FormsUpdatedAdded 2026-08-28

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
35
FormsAdded 2026-09-12

Filtered to zero

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

  • empty-state
  • filter
  • search
  • zero-results
36
FormsAdded 2026-09-12

Parsed query chips

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

  • search
  • query-syntax
  • chips
  • facets
37
FormsAdded 2026-09-12

Compound-value picker

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

  • select
  • optgroup
  • polymorphic
  • forms
38
ColorUpdatedAdded 2026-08-11

Ground-referenced color

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

  • color
  • contrast
  • color-mix
  • accessibility
39
ColorUpdatedAdded 2026-08-21

Single-property color variants

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

  • color
  • color-mix
  • custom-properties
  • theming
40
ColorUpdatedAdded 2026-09-12

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