#04172B
Closest named color: Rich Black (#0D1B2A). oklch(20.1% 0.048 251), rgb(4, 23, 43).
Aa
White text reads best on this color (18.06:1).
About this color
#04172B is a very dark, muted blue. In OKLCH its lightness is 20%, 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 0.021 away. White text reads best on it, at 18.06:1.
| Hue family | Blues |
| Lightness | very dark (20%) |
| Chroma | muted (0.048) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.16:1 |
| White text | 18.06:1 |
Values
| HEX | #04172B |
| RGB | rgb(4, 23, 43) |
| HSL | hsl(211, 83%, 9%) |
| OKLCH | oklch(20.1% 0.048 251) |
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 #04172B | 18.06:1 | AAA | Lc -106.8 | Preferred for body text |
| Black text on #04172B | 1.16:1 | Fails | Lc 0.0 | Not readable |
| #04172B text on white | 18.06:1 | AAA | Lc 104.6 | Preferred for body text |
| #04172B 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
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
#75A5D8
oklch(70.8% 0.091 250.7)
-
Step 500
500
#508DCD
oklch(63% 0.116 251.2)
-
Step 600
600
#3276BA
oklch(55.6% 0.126 251.2)
-
Step 700
700
#2463A0
oklch(49.1% 0.117 250.9)
-
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)
#04172B
oklch(20.1% 0.048 251)
#04172B 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) | #0E182C | 0.015 |
| Deuteranopia (no green cones) | #08152B | 0.008 |
| Tritanopia (no blue cones) | #001C1E | 0.037 |
| Achromatopsia (no color) | #161616 | 0.048 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #04172B
#04172B
oklch(20.1% 0.048 251)
- #221200
#221200
oklch(20% 0.043 70.9)
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 #04172B, 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 0.041
- Navy Blue #001146 ΔE 0.057
- Dark #1B2431 ΔE 0.060
- Almost Black #070D0D ΔE 0.065
- Dark Navy #000435 ΔE 0.065
- Oxford Blue #1B263B ΔE 0.069
- Jet #212529 ΔE 0.072
Use #04172B 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.