#05283F
Closest named color: Oxford Blue (#1B263B). oklch(26.6% 0.058 242.6), rgb(5, 40, 63).
Aa
White text reads best on this color (15.19:1).
About this color
#05283F is a dark, muted blue. In OKLCH its lightness is 27%, its chroma 0.058 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.023 away. White text reads best on it, at 15.19:1.
| Hue family | Blues |
| Lightness | dark (27%) |
| Chroma | muted (0.058) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.38:1 |
| White text | 15.19:1 |
Values
| HEX | #05283F |
| RGB | rgb(5, 40, 63) |
| HSL | hsl(204, 85%, 13%) |
| OKLCH | oklch(26.6% 0.058 242.6) |
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 #05283F | 15.19:1 | AAA | Lc -104.6 | Preferred for body text |
| Black text on #05283F | 1.38:1 | Fails | Lc 0.0 | Not readable |
| #05283F text on white | 15.19:1 | AAA | Lc 101.9 | Preferred for body text |
| #05283F text on black | 1.38:1 | 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
#F0F6FB
oklch(97% 0.009 242.8)
-
Step 100
100
#DFECF6
oklch(93.6% 0.019 240.7)
-
Step 200
200
#C4DDF1
oklch(88.5% 0.038 242.2)
-
Step 300
300
#9AC7EA
oklch(81% 0.069 242.1)
-
Step 400
400
#5EA8DF
oklch(70.6% 0.11 242.6)
-
Step 500
500
#2291D6
oklch(63% 0.14 242.5)
-
Step 600
600
#007ABA
oklch(55.6% 0.133 242.5)
-
Step 700
700
#00669D
oklch(49% 0.118 242.7)
-
Step 800
800
#005482
oklch(42.8% 0.102 242.4)
-
Step 900
900
#00466D
oklch(37.8% 0.09 242.2)
-
Step 950
950 (this color)
#05283F
oklch(26.6% 0.058 242.6)
#05283F 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) | #1D2940 | 0.027 |
| Deuteranopia (no green cones) | #15233F | 0.021 |
| Tritanopia (no blue cones) | #002E30 | 0.041 |
| Achromatopsia (no color) | #262626 | 0.058 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #05283F
#05283F
oklch(26.6% 0.058 242.6)
- #391E02
#391E02
oklch(26.6% 0.058 62.5)
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 #05283F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.023
- Dark #1B2431 ΔE 0.033
- Jet #212529 ΔE 0.049
- Space Cadet #2B2D42 ΔE 0.053
- Rich Black #0D1B2A ΔE 0.053
- Gunmetal #293241 ΔE 0.058
- Marine #042E60 ΔE 0.061
- Prussian Blue #1D3557 ΔE 0.065
Use #05283F 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.