#031B28
Closest named color: Rich Black (#0D1B2A). oklch(21% 0.04 235.2), rgb(3, 27, 40).
Aa
White text reads best on this color (17.62:1).
About this color
#031B28 is a very dark, muted blue. In OKLCH its lightness is 21%, its chroma 0.040 and its hue 235°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.013 away. White text reads best on it, at 17.62:1.
| Hue family | Blues |
| Lightness | very dark (21%) |
| Chroma | muted (0.040) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.19:1 |
| White text | 17.62:1 |
Values
| HEX | #031B28 |
| RGB | rgb(3, 27, 40) |
| HSL | hsl(201, 86%, 8%) |
| OKLCH | oklch(21% 0.04 235.2) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #031B28 | 17.62:1 | AAA | Lc -106.6 | Preferred for body text |
| Black text on #031B28 | 1.19:1 | Fails | Lc 0.0 | Not readable |
| #031B28 text on white | 17.62:1 | AAA | Lc 104.3 | Preferred for body text |
| #031B28 text on black | 1.19:1 | Fails | Lc 0.0 | Not readable |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 950.
-
Step 50
50
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E2ECF2
oklch(93.7% 0.013 233.7)
-
Step 200
200
#C9DCE8
oklch(88.4% 0.026 235.4)
-
Step 300
300
#A4C6DB
oklch(80.9% 0.047 235.3)
-
Step 400
400
#71A9C9
oklch(70.8% 0.075 234.4)
-
Step 500
500
#4892BC
oklch(63% 0.097 236)
-
Step 600
600
#247CA8
oklch(55.6% 0.105 235.5)
-
Step 700
700
#146890
oklch(49% 0.098 235.7)
-
Step 800
800
#155575
oklch(42.6% 0.081 235.7)
-
Step 900
900
#1A475E
oklch(37.8% 0.063 234.2)
-
Step 950
950 (this color)
#031B28
oklch(21% 0.04 235.2)
#031B28 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #151B29 | 0.025 |
| Deuteranopia (no green cones) | #0F1728 | 0.020 |
| Tritanopia (no blue cones) | #001E1F | 0.025 |
| Achromatopsia (no color) | #191919 | 0.040 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #031B28
#031B28
oklch(21% 0.04 235.2)
- #261305
#261305
oklch(21% 0.04 56.5)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #031B28, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.013
- Rich Navy #001219 ΔE 0.043
- Dark #1B2431 ΔE 0.051
- Jet #212529 ΔE 0.060
- Oxford Blue #1B263B ΔE 0.062
- Almost Black #070D0D ΔE 0.067
- Navy Blue #001146 ΔE 0.069
- Dark Navy #000435 ΔE 0.081
Use #031B28 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.