#031D2B
Closest named color: Rich Black (#0D1B2A). oklch(21.9% 0.042 235.6), rgb(3, 29, 43).
Aa
White text reads best on this color (17.29:1).
About this color
#031D2B is a very dark, muted blue. In OKLCH its lightness is 22%, its chroma 0.042 and its hue 236°. 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 17.29:1.
| Hue family | Blues |
| Lightness | very dark (22%) |
| Chroma | muted (0.042) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.21:1 |
| White text | 17.29:1 |
Values
| HEX | #031D2B |
| RGB | rgb(3, 29, 43) |
| HSL | hsl(201, 87%, 9%) |
| OKLCH | oklch(21.9% 0.042 235.6) |
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 #031D2B | 17.29:1 | AAA | Lc -106.3 | Preferred for body text |
| Black text on #031D2B | 1.21:1 | Fails | Lc 0.0 | Not readable |
| #031D2B text on white | 17.29:1 | AAA | Lc 104.0 | Preferred for body text |
| #031D2B text on black | 1.21:1 | 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
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E1ECF2
oklch(93.7% 0.014 231.2)
-
Step 200
200
#C8DDE9
oklch(88.6% 0.028 232.7)
-
Step 300
300
#A2C6DD
oklch(80.8% 0.05 236.3)
-
Step 400
400
#6EA9CC
oklch(70.8% 0.08 235.6)
-
Step 500
500
#4393BF
oklch(63.2% 0.102 235.7)
-
Step 600
600
#1A7CAB
oklch(55.5% 0.111 235.9)
-
Step 700
700
#066993
oklch(49.2% 0.103 235.4)
-
Step 800
800
#0E5577
oklch(42.6% 0.086 236)
-
Step 900
900
#174760
oklch(37.8% 0.066 235.3)
-
Step 950
950 (this color)
#031D2B
oklch(21.9% 0.042 235.6)
#031D2B 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) | #161D2C | 0.025 |
| Deuteranopia (no green cones) | #11192B | 0.021 |
| Tritanopia (no blue cones) | #002122 | 0.027 |
| Achromatopsia (no color) | #1B1B1B | 0.042 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #031D2B
#031D2B
oklch(21.9% 0.042 235.6)
- #291406
#291406
oklch(21.8% 0.042 53.3)
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 #031D2B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.013
- Dark #1B2431 ΔE 0.044
- Rich Navy #001219 ΔE 0.051
- Oxford Blue #1B263B ΔE 0.054
- Jet #212529 ΔE 0.055
- Navy Blue #001146 ΔE 0.068
- Almost Black #070D0D ΔE 0.075
- Dark Navy #000435 ΔE 0.085
Use #031D2B 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.