#031B29
Closest named color: Rich Black (#0D1B2A). oklch(21.1% 0.041 237.2), rgb(3, 27, 41).
Aa
White text reads best on this color (17.60:1).
About this color
#031B29 is a very dark, muted blue. In OKLCH its lightness is 21%, its chroma 0.041 and its hue 237°. 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 17.60:1.
| Hue family | Blues |
| Lightness | very dark (21%) |
| Chroma | muted (0.041) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.19:1 |
| White text | 17.60:1 |
Values
| HEX | #031B29 |
| RGB | rgb(3, 27, 41) |
| HSL | hsl(202, 86%, 9%) |
| OKLCH | oklch(21.1% 0.041 237.2) |
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 #031B29 | 17.60:1 | AAA | Lc -106.5 | Preferred for body text |
| Black text on #031B29 | 1.19:1 | Fails | Lc 0.0 | Not readable |
| #031B29 text on white | 17.60:1 | AAA | Lc 104.3 | Preferred for body text |
| #031B29 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
#E2EBF2
oklch(93.5% 0.014 241)
-
Step 200
200
#C9DCE9
oklch(88.4% 0.027 237.6)
-
Step 300
300
#A4C6DD
oklch(80.9% 0.049 237.8)
-
Step 400
400
#71A8CB
oklch(70.7% 0.077 237.3)
-
Step 500
500
#4792BE
oklch(63.1% 0.1 237)
-
Step 600
600
#237CAB
oklch(55.7% 0.109 237.1)
-
Step 700
700
#136892
oklch(49.1% 0.1 236.9)
-
Step 800
800
#155577
oklch(42.7% 0.084 237.3)
-
Step 900
900
#1A4660
oklch(37.6% 0.065 238)
-
Step 950
950 (this color)
#031B29
oklch(21.1% 0.041 237.2)
#031B29 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) | #141B2A | 0.023 |
| Deuteranopia (no green cones) | #0F1729 | 0.020 |
| Tritanopia (no blue cones) | #001F20 | 0.027 |
| Achromatopsia (no color) | #191919 | 0.041 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #031B29
#031B29
oklch(21.1% 0.041 237.2)
- #271304
#271304
oklch(21.2% 0.042 57)
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 #031B29, 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 0.044
- Dark #1B2431 ΔE 0.050
- Jet #212529 ΔE 0.060
- Oxford Blue #1B263B ΔE 0.061
- Navy Blue #001146 ΔE 0.067
- Almost Black #070D0D ΔE 0.068
- Dark Navy #000435 ΔE 0.080
Use #031B29 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.