#031529
Closest named color: Rich Black (#0D1B2A). oklch(19.3% 0.048 251.4), rgb(3, 21, 41).
Aa
White text reads best on this color (18.37:1).
About this color
#031529 is a very dark, muted blue. In OKLCH its lightness is 19%, its chroma 0.048 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.028 away. White text reads best on it, at 18.37:1.
| Hue family | Blues |
| Lightness | very dark (19%) |
| Chroma | muted (0.048) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.14:1 |
| White text | 18.37:1 |
Values
| HEX | #031529 |
| RGB | rgb(3, 21, 41) |
| HSL | hsl(212, 86%, 9%) |
| OKLCH | oklch(19.3% 0.048 251.4) |
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 #031529 | 18.37:1 | AAA | Lc -107.0 | Preferred for body text |
| Black text on #031529 | 1.14:1 | Fails | Lc 0.0 | Not readable |
| #031529 text on white | 18.37:1 | AAA | Lc 104.9 | Preferred for body text |
| #031529 text on black | 1.14:1 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EBF5
oklch(93.6% 0.017 250.8)
-
Step 200
200
#CADBEE
oklch(88.5% 0.032 251.1)
-
Step 300
300
#A6C4E5
oklch(80.9% 0.057 251)
-
Step 400
400
#76A5D8
oklch(70.8% 0.091 251.2)
-
Step 500
500
#518DCD
oklch(63.1% 0.116 251.5)
-
Step 600
600
#3376BA
oklch(55.6% 0.126 251.4)
-
Step 700
700
#2563A1
oklch(49.2% 0.118 251.5)
-
Step 800
800
#205182
oklch(42.7% 0.097 251.2)
-
Step 900
900
#204368
oklch(37.6% 0.076 251.6)
-
Step 950
950 (this color)
#031529
oklch(19.3% 0.048 251.4)
#031529 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) | #0B162A | 0.013 |
| Deuteranopia (no green cones) | #061329 | 0.008 |
| Tritanopia (no blue cones) | #001A1C | 0.037 |
| Achromatopsia (no color) | #141414 | 0.048 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #031529
#031529
oklch(19.3% 0.048 251.4)
- #201100
#201100
oklch(19.4% 0.042 71.9)
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 #031529, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.028
- Rich Navy #001219 ΔE 0.035
- Navy Blue #001146 ΔE 0.059
- Almost Black #070D0D ΔE 0.059
- Dark Navy #000435 ΔE 0.060
- Dark Navy Blue #00022E ΔE 0.067
- Midnight #03012D ΔE 0.068
- Dark #1B2431 ΔE 0.068
Use #031529 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.