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A little color. A new perspective.

Published Aug 28, 2026

One Diff Clears the Queue

Test in Color Lab

Five colors, endless possibilities. Select a color to copy its HEX.

A minimal developer-tool palette of clean white, near-black ink, neutral gray, focused cyan, and dark graphite for code review and test logs.

The feeling

A precise code review with steady line numbers, one cyan diff, and a compact graphite test log

Explore this palette ↓

The mood

A small change waits in a quiet review queue, with one cyan diff line interrupting an otherwise neutral screen. Review Ink keeps filenames, code, and decisions sharp, while Line Number gives the gutter and secondary metadata an even rhythm.

Change Cyan marks the exact edit without flooding the interface with status color. Test Log Graphite holds compact command output and supporting details in a darker panel beneath the review.

How to use it

Use Clean Canvas for the review page, Review Ink for code, comments, filenames, and approval labels, and Line Number for gutters, inactive controls, and quiet separators. Change Cyan can identify the changed line, focused comment, or active queue item.

Reserve Test Log Graphite for the compact test panel and secondary technical output. Begin with 66% Clean Canvas, 25% Line Number, and 9% Change Cyan, then add ink and graphite according to the information hierarchy.

What to watch

Review Ink reaches 15.72:1 on Clean Canvas, 7.34:1 on Line Number, and 7.40:1 on Change Cyan, so those pairs pass normal-size AA. On Test Log Graphite it measures only 1.93:1 and fails both normal and large text. Use Clean Canvas on graphite instead at 8.15:1.

Line Number and Change Cyan are almost identical in luminance at 1.01:1. Their shapes and labels must distinguish unchanged metadata from the active diff; never use the gray-to-cyan shift alone to communicate review state.

A considered balance

Make room for
the right colors.

Use Clean Canvas for the review page, Review Ink for code and decisions, Line Number for gutters and metadata, Change Cyan for the focused diff, and Test Log Graphite for command output. Switch to Clean Canvas text on graphite.

Start with a generous background, introduce your primary color, then use the highlight sparingly. The ratios are a guide for large surfaces, not a fixed recipe.

66 Base
25 Main
9 Point
Clean Canvas

Background & breathing room

Line Number

Cards, graphics & sections

Change Cyan

Buttons & key signals

Background · Primary · Highlight. Use text and accent colors where their roles call for them.

Text on background
15.72:1 #171819 on #F1F1EF · AAA normal text
Text on primary
7.34:1 #171819 on #A4A7A8 · AAA normal text
Text on highlight
7.40:1 #171819 on #17B9C1 · AAA normal text
Text on accent
1.93:1 #171819 on #45484A · Not suitable for text

Recommended text on accent

The original text has low contrast (1.93:1). This example uses Clean Canvas (#F1F1EF) from the same palette instead of #171819 on #45484A, improving contrast to 8.15:1. This meets WCAG AA for normal text.

Contrast is calculated for these specific pairs. Large text means at least 24 px regular or about 18.7 px bold. Check every pairing in your final design.

IMAGINE THE POSSIBILITIES

One palette.
A world of possibilities.

See how these five colors come together in a website, a poster, a brand, and a presentation. Explore a different palette and watch the mood change.

ONDA STUDIO / WEB PREVIEW
Journal   Places   About

INDEPENDENT STUDIO · SEOUL

Design with
today’s color.

A little space for fresh ideas. A considered palette for whatever comes next.

Prepared design previews, recolored with this palette.

COLOR NOTE

Review Ink on Test Log Graphite is only 1.93:1 and fails normal and large text. Use Clean Canvas there at 8.15:1. Line Number and Change Cyan are only 1.01:1 apart, so use shapes, labels, and position to distinguish review states.

From inspiration to creation

Your next idea,
in these colors.

Add a considered color direction to the design you already have in mind. Your layout and instructions stay yours.

  1. Write your design request.
  2. Choose a color guide and copy it.
  3. Paste it after your request.
  4. Review the result and check readability.

Try it in the design or AI tool you already use. 

[Color guide — coloring.today / one-diff-clears-the-queue]
Apply this palette to the design requested above. Preserve the requested layout, content, and interactions. If an explicit requirement conflicts with this color guide, identify the conflict instead of silently overriding it.

Text: Review Ink #171819
Primary: Line Number #A4A7A8
Highlight: Change Cyan #17B9C1
Accent: Test Log Graphite #45484A
Background: Clean Canvas #F1F1EF

Mood: A precise code review with steady line numbers, one cyan diff, and a compact graphite test log
Suggested uses: Developer tools
Application note: Use Clean Canvas for the review page, Review Ink for code and decisions, Line Number for gutters and metadata, Change Cyan for the focused diff, and Test Log Graphite for command output. Switch to Clean Canvas text on graphite.
Avoid: Review Ink on Test Log Graphite is only 1.93:1 and fails normal and large text. Use Clean Canvas there at 8.15:1. Line Number and Change Cyan are only 1.01:1 apart, so use shapes, labels, and position to distinguish review states.
Use approximately 66% background, 25% primary, and 9% highlight across large surfaces. These ratios are a starting point, not a rigid rule. Use text and accent colors according to their roles.

Keep the original HEX values. Choose readable text/background pairings without silently changing the palette. Do not introduce unrelated colors.

[Color guide — coloring.today / one-diff-clears-the-queue]
Apply this palette to the design requested above. Preserve the requested layout, content, and interactions. If an explicit requirement conflicts with this color guide, identify the conflict instead of silently overriding it.

Text: Review Ink #171819
Primary: Line Number #A4A7A8
Highlight: Change Cyan #17B9C1
Accent: Test Log Graphite #45484A
Background: Clean Canvas #F1F1EF

Mood: A precise code review with steady line numbers, one cyan diff, and a compact graphite test log
Suggested uses: Developer tools
Application note: Use Clean Canvas for the review page, Review Ink for code and decisions, Line Number for gutters and metadata, Change Cyan for the focused diff, and Test Log Graphite for command output. Switch to Clean Canvas text on graphite.
Avoid: Review Ink on Test Log Graphite is only 1.93:1 and fails normal and large text. Use Clean Canvas there at 8.15:1. Line Number and Change Cyan are only 1.01:1 apart, so use shapes, labels, and position to distinguish review states.
Use approximately 66% background, 25% primary, and 9% highlight across large surfaces. These ratios are a starting point, not a rigid rule. Use text and accent colors according to their roles.

Use these semantic tokens consistently. Keep the original HEX values.
:root {
  --color-text: #171819;
  --color-primary: #A4A7A8;
  --color-highlight: #17B9C1;
  --color-accent: #45484A;
  --color-background: #F1F1EF;
}
Background is the canvas, text is readable copy, primary is a key surface, highlight draws attention, and accent adds small secondary details.

[Color guide — coloring.today / one-diff-clears-the-queue]
Apply this palette to the design requested above. Preserve the requested layout, content, and interactions. If an explicit requirement conflicts with this color guide, identify the conflict instead of silently overriding it.

Text: Review Ink #171819
Primary: Line Number #A4A7A8
Highlight: Change Cyan #17B9C1
Accent: Test Log Graphite #45484A
Background: Clean Canvas #F1F1EF

Mood: A precise code review with steady line numbers, one cyan diff, and a compact graphite test log
Suggested uses: Developer tools
Application note: Use Clean Canvas for the review page, Review Ink for code and decisions, Line Number for gutters and metadata, Change Cyan for the focused diff, and Test Log Graphite for command output. Switch to Clean Canvas text on graphite.
Avoid: Review Ink on Test Log Graphite is only 1.93:1 and fails normal and large text. Use Clean Canvas there at 8.15:1. Line Number and Change Cyan are only 1.01:1 apart, so use shapes, labels, and position to distinguish review states.
Use approximately 66% background, 25% primary, and 9% highlight across large surfaces. These ratios are a starting point, not a rigid rule. Use text and accent colors according to their roles.

Text/background contrast: 15.72:1. This is one measured pair, not a guarantee for the whole palette. Check every actual text/background pairing against WCAG AA. Prefer readable combinations from the original colors, keep visible keyboard focus, and never communicate state through color alone. If no original pairing meets the requirement, propose a separately labeled derived color with its original HEX, proposed HEX, purpose and measured contrast. Never overwrite the source palette.

This guide preserves the original HEX values. Review the output before using it.

Bring it into your project

Five colors.
Ready to use.

Copy the same colors as semantic CSS variables. Every preview and prompt on this page uses this palette. 

:root {
  --color-text: #171819;
  --color-primary: #A4A7A8;
  --color-highlight: #17B9C1;
  --color-accent: #45484A;
  --color-background: #F1F1EF;
}

A little more inspiration.

All palettes ↗

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