#04213C
Closest named color: Oxford Blue (#1B263B). oklch(24.3% 0.062 250.1), rgb(4, 33, 60).
Aa
White text reads best on this color (16.30:1).
About this color
#04213C is a very dark, muted blue. In OKLCH its lightness is 24%, its chroma 0.062 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.034 away. White text reads best on it, at 16.30:1.
| Hue family | Blues |
| Lightness | very dark (24%) |
| Chroma | muted (0.062) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.28:1 |
| White text | 16.30:1 |
Values
| HEX | #04213C |
| RGB | rgb(4, 33, 60) |
| HSL | hsl(209, 88%, 13%) |
| OKLCH | oklch(24.3% 0.062 250.1) |
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 #04213C | 16.30:1 | AAA | Lc -105.6 | Preferred for body text |
| Black text on #04213C | 1.28:1 | Fails | Lc 0.0 | Not readable |
| #04213C text on white | 16.30:1 | AAA | Lc 103.0 | Preferred for body text |
| #04213C text on black | 1.28:1 | 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
#E0EBF8
oklch(93.6% 0.021 252.5)
-
Step 200
200
#C6DCF4
oklch(88.6% 0.041 250.6)
-
Step 300
300
#9DC5EF
oklch(80.9% 0.073 250)
-
Step 400
400
#65A5E7
oklch(70.6% 0.118 250.5)
-
Step 500
500
#348DE0
oklch(63.1% 0.15 250.3)
-
Step 600
600
#0076CB
oklch(55.7% 0.158 250)
-
Step 700
700
#0063AC
oklch(49.2% 0.139 250)
-
Step 800
800
#00518E
oklch(42.8% 0.121 249.9)
-
Step 900
900
#0C4373
oklch(37.6% 0.098 250.3)
-
Step 950
950 (this color)
#04213C
oklch(24.3% 0.062 250.1)
#04213C 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) | #14233D | 0.020 |
| Deuteranopia (no green cones) | #0B1E3B | 0.011 |
| Tritanopia (no blue cones) | #00272B | 0.044 |
| Achromatopsia (no color) | #202020 | 0.062 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #04213C
#04213C
oklch(24.3% 0.062 250.1)
- #301B00
#301B00
oklch(24.4% 0.053 70.1)
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 #04213C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.034
- Rich Black #0D1B2A ΔE 0.037
- Dark #1B2431 ΔE 0.038
- Navy Blue #001146 ΔE 0.055
- Jet #212529 ΔE 0.056
- Space Cadet #2B2D42 ΔE 0.071
- Marine #042E60 ΔE 0.074
- Gunmetal #293241 ΔE 0.079
Use #04213C 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.