#042839
Closest named color: Oxford Blue (#1B263B). oklch(26.2% 0.051 234), rgb(4, 40, 57).
Aa
White text reads best on this color (15.35:1).
About this color
#042839 is a dark, muted blue. In OKLCH its lightness is 26%, its chroma 0.051 and its hue 234°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.026 away. White text reads best on it, at 15.35:1.
| Hue family | Blues |
| Lightness | dark (26%) |
| Chroma | muted (0.051) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.36:1 |
| White text | 15.35:1 |
Values
| HEX | #042839 |
| RGB | rgb(4, 40, 57) |
| HSL | hsl(199, 87%, 12%) |
| OKLCH | oklch(26.2% 0.051 234) |
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 #042839 | 15.35:1 | AAA | Lc -104.8 | Preferred for body text |
| Black text on #042839 | 1.36:1 | Fails | Lc 0.0 | Not readable |
| #042839 text on white | 15.35:1 | AAA | Lc 102.0 | Preferred for body text |
| #042839 text on black | 1.36:1 | 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
#F0F6FA
oklch(97% 0.008 236.6)
-
Step 100
100
#DFECF4
oklch(93.6% 0.018 234.5)
-
Step 200
200
#C5DDEC
oklch(88.4% 0.033 235.2)
-
Step 300
300
#9BC8E2
oklch(81% 0.06 233.8)
-
Step 400
400
#5FABD3
oklch(70.8% 0.096 233.3)
-
Step 500
500
#2294C8
oklch(63% 0.123 234.4)
-
Step 600
600
#007DAD
oklch(55.6% 0.117 234.3)
-
Step 700
700
#006992
oklch(49.1% 0.103 234.3)
-
Step 800
800
#005678
oklch(42.7% 0.089 233.9)
-
Step 900
900
#004865
oklch(37.8% 0.079 233.7)
-
Step 950
950 (this color)
#042839
oklch(26.2% 0.051 234)
#042839 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) | #20283A | 0.032 |
| Deuteranopia (no green cones) | #182339 | 0.025 |
| Tritanopia (no blue cones) | #002C2E | 0.029 |
| Achromatopsia (no color) | #252525 | 0.051 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #042839
#042839
oklch(26.2% 0.051 234)
- #371D0A
#371D0A
oklch(26.2% 0.051 54.4)
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 #042839, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.026
- Dark #1B2431 ΔE 0.028
- Jet #212529 ΔE 0.041
- Rich Black #0D1B2A ΔE 0.048
- Space Cadet #2B2D42 ΔE 0.057
- Gunmetal #293241 ΔE 0.060
- Midnight Green #073B4C ΔE 0.069
- Marine #042E60 ΔE 0.072
Use #042839 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.