#031633
Closest named color: Rich Black (#0D1B2A). oklch(20.4% 0.063 257.5), rgb(3, 22, 51).
Aa
White text reads best on this color (18.00:1).
About this color
#031633 is a very dark, muted blue. In OKLCH its lightness is 20%, its chroma 0.063 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.031 away. White text reads best on it, at 18.00:1.
| Hue family | Blues |
| Lightness | very dark (20%) |
| Chroma | muted (0.063) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.16:1 |
| White text | 18.00:1 |
Values
| HEX | #031633 |
| RGB | rgb(3, 22, 51) |
| HSL | hsl(216, 89%, 11%) |
| OKLCH | oklch(20.4% 0.063 257.5) |
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 #031633 | 18.00:1 | AAA | Lc -106.7 | Preferred for body text |
| Black text on #031633 | 1.16:1 | Fails | Lc 0.0 | Not readable |
| #031633 text on white | 18.00:1 | AAA | Lc 104.5 | Preferred for body text |
| #031633 text on black | 1.16:1 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF9
oklch(93.7% 0.022 256.7)
-
Step 200
200
#C8DBF5
oklch(88.5% 0.041 256.2)
-
Step 300
300
#A2C3F1
oklch(80.9% 0.075 256.7)
-
Step 400
400
#70A2EB
oklch(70.7% 0.12 257.8)
-
Step 500
500
#4989E4
oklch(63.2% 0.153 257.5)
-
Step 600
600
#2970D2
oklch(55.5% 0.167 257.6)
-
Step 700
700
#1B5EB6
oklch(49.2% 0.154 257.3)
-
Step 800
800
#194D93
oklch(42.7% 0.128 257.3)
-
Step 900
900
#1B4175
oklch(37.7% 0.099 257.1)
-
Step 950
950 (this color)
#031633
oklch(20.4% 0.063 257.5)
#031633 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) | #061934 | 0.012 |
| Deuteranopia (no green cones) | #001432 | 0.009 |
| Tritanopia (no blue cones) | #001D22 | 0.047 |
| Achromatopsia (no color) | #171717 | 0.063 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #031633
#031633
oklch(20.4% 0.063 257.5)
- #221400
#221400
oklch(20.5% 0.043 76.7)
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 #031633, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.031
- Navy Blue #001146 ΔE 0.040
- Rich Navy #001219 ΔE 0.054
- Dark Navy #000435 ΔE 0.056
- Night Blue #040348 ΔE 0.060
- Dark #1B2431 ΔE 0.064
- Very Dark Blue #000133 ΔE 0.067
- Dark Navy Blue #00022E ΔE 0.067
Use #031633 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.