#04172C
Closest named color: Rich Black (#0D1B2A). oklch(20.2% 0.049 252), rgb(4, 23, 44).
Aa
White text reads best on this color (18.03:1).
About this color
#04172C is a very dark, muted blue. In OKLCH its lightness is 20%, its chroma 0.049 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.021 away. White text reads best on it, at 18.03:1.
| Hue family | Blues |
| Lightness | very dark (20%) |
| Chroma | muted (0.049) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.16:1 |
| White text | 18.03:1 |
Values
| HEX | #04172C |
| RGB | rgb(4, 23, 44) |
| HSL | hsl(212, 83%, 9%) |
| OKLCH | oklch(20.2% 0.049 252) |
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 #04172C | 18.03:1 | AAA | Lc -106.8 | Preferred for body text |
| Black text on #04172C | 1.16:1 | Fails | Lc 0.0 | Not readable |
| #04172C text on white | 18.03:1 | AAA | Lc 104.6 | Preferred for body text |
| #04172C 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EBF5
oklch(93.6% 0.017 250.8)
-
Step 200
200
#CADBEF
oklch(88.5% 0.033 252.5)
-
Step 300
300
#A6C4E6
oklch(81% 0.058 251.8)
-
Step 400
400
#75A4DA
oklch(70.6% 0.094 252.5)
-
Step 500
500
#4F8DD0
oklch(63.2% 0.12 251.9)
-
Step 600
600
#3176BD
oklch(55.7% 0.13 251.9)
-
Step 700
700
#2362A3
oklch(49% 0.122 252.3)
-
Step 800
800
#1F5184
oklch(42.8% 0.1 251.7)
-
Step 900
900
#1F436A
oklch(37.7% 0.079 252.3)
-
Step 950
950 (this color)
#04172C
oklch(20.2% 0.049 252)
#04172C 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) | #0D182D | 0.013 |
| Deuteranopia (no green cones) | #07152C | 0.008 |
| Tritanopia (no blue cones) | #001C1F | 0.037 |
| Achromatopsia (no color) | #161616 | 0.050 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #04172C
#04172C
oklch(20.2% 0.049 252)
- #221300
#221300
oklch(20.2% 0.043 73.8)
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 #04172C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.021
- Rich Navy #001219 ΔE 0.042
- Navy Blue #001146 ΔE 0.055
- Dark #1B2431 ΔE 0.060
- Dark Navy #000435 ΔE 0.064
- Almost Black #070D0D ΔE 0.067
- Oxford Blue #1B263B ΔE 0.068
- Jet #212529 ΔE 0.072
Use #04172C 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.