Design system · v1.3.0
Quiet surfaces, one accent, and diagrams that explain themselves.
ds is one stylesheet for fin1te.com, topo, ack and lab: 43.9 KB gzipped, 4 cascade layers, light and dark, no framework.
.pboxCommand palette
- Introduction/introduction
- Component gallery/components
- Getting started/getting-started
- Principles/principles
- Products/brands
.btn .seg .chipControls
.playbar .scrubFor ack
.heatmapFor lab: cron starts in a week
- Stylesheet
- 43.9 KBgzipped, 251.5 KB raw
- Components
- 82and 16 patterns and templates
- Tokens
- 96tuned for both themes
- JavaScript
- 0 KBrequired to use it
.timelineWork log
- 2026
Jio Platforms
Spark to Rust
Same jobs, a third of the memory.
- 2025
Jio Platforms
Structured Streaming
400+ jobs off DStreams.
- 2024
Jio Platforms
ClickHouse at scale
Trillions of rows, read in seconds.
.tableTabular figures
| Job | Engine | p50 | Memory |
|---|---|---|---|
| Sessionize | Spark | 41 s | 48 GB |
| Sessionize | Rust | 13 s | 14 GB |
| Dedupe | Rust | 6 s | 3 GB |
.plot .ch-line .ch-thrNew in 1.2: Data display
Latency, checkout-api
Hover for values
- p50
- p95
- p99
.uptime .svc-stateNew in 1.2: Operations
.status-dot .toastState
All systems normalElevated latency on searchCheckout is downInstall
One line, pinned to a version
Every component, the tokens for both themes and the diagram layer are in one file. Pin the version in production: a pinned file never changes and is cached for a year.
<link rel="stylesheet" href="https://ds.fin1te.com/v/1.3.0/ds.css" />Then set data-theme on <html> before first paint, and write markup. Getting started has the four steps.
| File | Size | Use it for |
|---|---|---|
/v/1.3.0/ds.css | 43.9 KB | Production. Immutable, cached for a year. |
/ds.css | 43.9 KB | The latest release. Cached for an hour. |
/v/1.3.0/core.css | 14.4 KB | The 1.1 system on its own. Add ui.css, charts.css or ops.css as needed. |
/tokens.css | 1.3 KB | Custom properties for both themes, nothing else. |
/tokens.json | JSON | Colours, type scale, space and motion, for charts and canvas code. |
Versions 1.x only adds. A class that shipped in 1.0 still works in every 1.x, and /v/1.0.0/ stays published. Product-specific CSS goes on top of the tokens, in the product's own files.
Used by
Four products, one look
ack and lab vendor a copy of ds.css and add only what is their own; fin1te.com and topo, where it came from, share its tokens. What they share and where they differ is on the products page.
fin1te.com
Writing, the work log and the stats page. Document flow, rows, the square grid behind every head.
.hdr.rows.timeline.stat-tilesfin1te.comfin1te/topotopo
The architecture diagram editor. Islands over a dot-grid canvas, side panels, and the whole diagram layer.
.island.panel.tp.sdtopo.fin1te.comfin1te/ackack
Animated sequence diagrams on a real time axis: an editor, a playback bar, a scrubber and a speed control.
.editor.playbar.scrub.rangeack.fin1te.comfin1te/lablab
Small private tools that run in the tab: a cron heatmap for the week and a schema converter.
.workbench.heatmap.drop.hdr-brandlab.fin1te.comFoundations
What everything is made of
Warm neutrals, one accent, amber for data at rest, two typefaces and one easing curve. Each has a page with the values and the reasons.
Color
Neutrals, the accent, amber, and contrast in both themes.
Tones and status
Seven tones for diagrams, three states for health.
Data color
Six series, the heat scale, and when to use which.
Typography
Mona Sans with its width axis, IBM Plex Mono for metadata.
Spacing and shape
Space scale, radii, borders and the two shadows.
Backdrops
Square grid, dot grid and the gradient phrase.
Motion
One easing curve, short durations, reduced motion respected.
Icons
153 diagram icons and the UI set, all on a 24 grid.
Layout
Max width, gutter, prose measure and the rem scaling.
Components
96 components, from a button to a trace waterfall
Controls and overlays, charts for every dashboard, and the parts of status pages, pipelines and consoles. Every card is the real markup at small size.