Clerk

What was measured

Closest neighbours

ΔE00 14

how alike two adjacent swatches look

Darkest to lightest

13.75:1

WCAG contrast across the set

Lightness covered

70 pts

of OKLCH lightness, 0–100

Under colour blindness

ΔE00 12.8

worst under protanopia

These two are one colour to a reader with protanopia. Fine while the set is read as an order; never use them to mean two different things without a label or an icon as well.

Five colours are not an interface, so this is an offer rather than a token set. It does not clear WCAG AA on secondary text — stated here rather than left for you to discover.

/* Clerk — High-volume data entry where the interface should disappear. */
:root {
  --palette-1: #112928;
  --palette-2: #345952;
  --palette-3: #668d7d;
  --palette-4: #a8c0b0;
  --palette-5: #eaf6e9;

  /* A suggested mapping, not a token set. It falls short of WCAG AA on secondary text — fix that before shipping. */
  --bg: #eaf6e9;
  --text: #112928;        /* 13.75:1 on --bg */
  --muted: #668d7d;      /* 3.33:1 on --bg */
  --accent: #668d7d;     /* 3.33:1 on --bg */
  --accent-text: #111111;
}

// tailwind.config — Clerk
export default {
  theme: {
    extend: {
      colors: {
        clerk: {
        100: "#112928",
        200: "#345952",
        300: "#668d7d",
        400: "#a8c0b0",
        500: "#eaf6e9",
        },
      },
    },
  },
};

Use the Clerk palette: #112928, #345952, #668D7D, #A8C0B0, #EAF6E9.

It is for this: High-volume data entry where the interface should disappear.

Map it as ground #EAF6E9, body text #112928, secondary text #668D7D, and one accent #668D7D with #111111 printed on it. That mapping does not clear WCAG AA on secondary text — body 13.75:1, secondary 3.33:1, accent 3.33:1. Fix the named role against the ground before shipping; do not ship the pair as given.

Do not use it for: Brand differentiation — this is deliberately anonymous.

Do not add a sixth colour, do not tint the greys toward a second hue, and do not carry meaning on hue alone — once colour vision is taken away the closest two of these sit only 12.8 apart on the CIEDE2000 scale, which is too close to tell apart, so pair every coloured state with a label or an icon.

How this palette was built · no hex was chosen by hand

The catalog states a recipe — ramp from hue 168 — and the five colours are derived from it in OKLCH, where a step of lightness is a step your eye agrees with rather than one the hex numbers agree with. That is why the numbers above are properties of this palette rather than claims about it.

Others for the same job