#042238
Closest named color: Dark (#1B2431). oklch(24.3% 0.055 244.6), rgb(4, 34, 56).
Aa
White text reads best on this color (16.26:1).
About this color
#042238 is a very dark, muted blue. In OKLCH its lightness is 24%, its chroma 0.055 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Dark (#1B2431), ΔE 0.032 away. White text reads best on it, at 16.26:1.
| Hue family | Blues |
| Lightness | very dark (24%) |
| Chroma | muted (0.055) |
| Temperature | cool |
| Nearest name | Dark (#1B2431) |
| Black text | 1.29:1 |
| White text | 16.26:1 |
Values
| HEX | #042238 |
| RGB | rgb(4, 34, 56) |
| HSL | hsl(205, 87%, 12%) |
| OKLCH | oklch(24.3% 0.055 244.6) |
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 #042238 | 16.26:1 | AAA | Lc -105.6 | Preferred for body text |
| Black text on #042238 | 1.29:1 | Fails | Lc 0.0 | Not readable |
| #042238 text on white | 16.26:1 | AAA | Lc 103.0 | Preferred for body text |
| #042238 text on black | 1.29:1 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E0ECF6
oklch(93.7% 0.019 243)
-
Step 200
200
#C6DCF0
oklch(88.4% 0.036 245.7)
-
Step 300
300
#9EC6E8
oklch(80.9% 0.064 244.3)
-
Step 400
400
#66A7DD
oklch(70.7% 0.104 245.1)
-
Step 500
500
#3490D3
oklch(63% 0.132 244.5)
-
Step 600
600
#0079BE
oklch(55.6% 0.139 244.6)
-
Step 700
700
#0066A1
oklch(49.2% 0.123 244.5)
-
Step 800
800
#005385
oklch(42.7% 0.107 244.8)
-
Step 900
900
#0C456C
oklch(37.7% 0.087 244.7)
-
Step 950
950 (this color)
#042238
oklch(24.3% 0.055 244.6)
#042238 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) | #182339 | 0.024 |
| Deuteranopia (no green cones) | #101E38 | 0.017 |
| Tritanopia (no blue cones) | #00272A | 0.037 |
| Achromatopsia (no color) | #202020 | 0.055 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #042238
#042238
oklch(24.3% 0.055 244.6)
- #311900
#311900
oklch(24.2% 0.054 64.3)
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 #042238, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark #1B2431 ΔE 0.032
- Rich Black #0D1B2A ΔE 0.032
- Oxford Blue #1B263B ΔE 0.033
- Jet #212529 ΔE 0.049
- Navy Blue #001146 ΔE 0.062
- Space Cadet #2B2D42 ΔE 0.070
- Gunmetal #293241 ΔE 0.077
- Marine #042E60 ΔE 0.079
Use #042238 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.