#031F30
Closest named color: Rich Black (#0D1B2A). oklch(22.8% 0.047 239.3), rgb(3, 31, 48).
Aa
White text reads best on this color (16.90:1).
About this color
#031F30 is a very dark, muted blue. In OKLCH its lightness is 23%, its chroma 0.047 and its hue 239°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.018 away. White text reads best on it, at 16.90:1.
| Hue family | Blues |
| Lightness | very dark (23%) |
| Chroma | muted (0.047) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.24:1 |
| White text | 16.90:1 |
Values
| HEX | #031F30 |
| RGB | rgb(3, 31, 48) |
| HSL | hsl(203, 88%, 10%) |
| OKLCH | oklch(22.8% 0.047 239.3) |
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 #031F30 | 16.90:1 | AAA | Lc -106.0 | Preferred for body text |
| Black text on #031F30 | 1.24:1 | Fails | Lc 0.0 | Not readable |
| #031F30 text on white | 16.90:1 | AAA | Lc 103.6 | Preferred for body text |
| #031F30 text on black | 1.24:1 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E1ECF4
oklch(93.7% 0.016 239.1)
-
Step 200
200
#C7DCEC
oklch(88.4% 0.032 240.7)
-
Step 300
300
#A0C6E1
oklch(80.8% 0.056 239.3)
-
Step 400
400
#6AA8D2
oklch(70.6% 0.089 239.4)
-
Step 500
500
#3C92C7
oklch(63.1% 0.114 239.4)
-
Step 600
600
#077BB3
oklch(55.5% 0.124 239.2)
-
Step 700
700
#006898
oklch(49.2% 0.11 238.7)
-
Step 800
800
#03557D
oklch(42.8% 0.095 238.9)
-
Step 900
900
#124665
oklch(37.7% 0.075 239.9)
-
Step 950
950 (this color)
#031F30
oklch(22.8% 0.047 239.3)
#031F30 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) | #171F31 | 0.025 |
| Deuteranopia (no green cones) | #101B30 | 0.019 |
| Tritanopia (no blue cones) | #002325 | 0.030 |
| Achromatopsia (no color) | #1D1D1D | 0.047 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #031F30
#031F30
oklch(22.8% 0.047 239.3)
- #2C1604
#2C1604
oklch(22.7% 0.046 58.3)
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 #031F30, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.018
- Dark #1B2431 ΔE 0.037
- Oxford Blue #1B263B ΔE 0.045
- Jet #212529 ΔE 0.051
- Rich Navy #001219 ΔE 0.062
- Navy Blue #001146 ΔE 0.064
- Space Cadet #2B2D42 ΔE 0.083
- Almost Black #070D0D ΔE 0.086
Use #031F30 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.