#04152C
Closest named color: Rich Black (#0D1B2A). oklch(19.6% 0.052 255.6), rgb(4, 21, 44).
Aa
White text reads best on this color (18.27:1).
About this color
#04152C is a very dark, muted blue. In OKLCH its lightness is 20%, its chroma 0.052 and its hue 256°. 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 18.27:1.
| Hue family | Blues |
| Lightness | very dark (20%) |
| Chroma | muted (0.052) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.14:1 |
| White text | 18.27:1 |
Values
| HEX | #04152C |
| RGB | rgb(4, 21, 44) |
| HSL | hsl(215, 83%, 9%) |
| OKLCH | oklch(19.6% 0.052 255.6) |
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 #04152C | 18.27:1 | AAA | Lc -106.9 | Preferred for body text |
| Black text on #04152C | 1.14:1 | Fails | Lc 0.0 | Not readable |
| #04152C text on white | 18.27:1 | AAA | Lc 104.8 | Preferred for body text |
| #04152C 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
#E2EBF6
oklch(93.7% 0.018 253.3)
-
Step 200
200
#CBDBF0
oklch(88.6% 0.034 255.2)
-
Step 300
300
#A7C3E9
oklch(80.9% 0.062 256.1)
-
Step 400
400
#77A3DE
oklch(70.7% 0.099 256)
-
Step 500
500
#528BD4
oklch(63.1% 0.126 255.4)
-
Step 600
600
#3574C2
oklch(55.7% 0.138 255.3)
-
Step 700
700
#2861A7
oklch(49.2% 0.127 255.3)
-
Step 800
800
#224F87
oklch(42.6% 0.106 255.4)
-
Step 900
900
#21426C
oklch(37.6% 0.082 255.4)
-
Step 950
950 (this color)
#04152C
oklch(19.6% 0.052 255.6)
#04152C 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) | #0A172D | 0.012 |
| Deuteranopia (no green cones) | #04132C | 0.007 |
| Tritanopia (no blue cones) | #001A1E | 0.039 |
| Achromatopsia (no color) | #151515 | 0.052 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #04152C
#04152C
oklch(19.6% 0.052 255.6)
- #201200
#201200
oklch(19.7% 0.041 74.9)
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 #04152C, 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 0.041
- Navy Blue #001146 ΔE 0.053
- Dark Navy #000435 ΔE 0.057
- Almost Black #070D0D ΔE 0.065
- Dark Navy Blue #00022E ΔE 0.066
- Dark #1B2431 ΔE 0.067
- Midnight #03012D ΔE 0.067
Use #04152C 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.