#05283D
Closest named color: Oxford Blue (#1B263B). oklch(26.4% 0.055 240.2), rgb(5, 40, 61).
Aa
White text reads best on this color (15.24:1).
About this color
#05283D is a dark, muted blue. In OKLCH its lightness is 26%, its chroma 0.055 and its hue 240°. 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 15.24:1.
| Hue family | Blues |
| Lightness | dark (26%) |
| Chroma | muted (0.055) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.37:1 |
| White text | 15.24:1 |
Values
| HEX | #05283D |
| RGB | rgb(5, 40, 61) |
| HSL | hsl(203, 85%, 13%) |
| OKLCH | oklch(26.4% 0.055 240.2) |
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 #05283D | 15.24:1 | AAA | Lc -104.7 | Preferred for body text |
| Black text on #05283D | 1.37:1 | Fails | Lc 0.0 | Not readable |
| #05283D text on white | 15.24:1 | AAA | Lc 101.9 | Preferred for body text |
| #05283D text on black | 1.37:1 | 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
#DFECF5
oklch(93.6% 0.018 237.8)
-
Step 200
200
#C5DDEF
oklch(88.5% 0.036 240.3)
-
Step 300
300
#9BC7E7
oklch(80.9% 0.065 240.2)
-
Step 400
400
#5FA9DB
oklch(70.7% 0.104 240)
-
Step 500
500
#2492D1
oklch(63% 0.133 240.2)
-
Step 600
600
#007BB6
oklch(55.6% 0.128 240.2)
-
Step 700
700
#00679A
oklch(49.1% 0.113 240.5)
-
Step 800
800
#00547F
oklch(42.6% 0.099 240.7)
-
Step 900
900
#00466B
oklch(37.7% 0.087 240.8)
-
Step 950
950 (this color)
#05283D
oklch(26.4% 0.055 240.2)
#05283D 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) | #1E283E | 0.028 |
| Deuteranopia (no green cones) | #16233D | 0.022 |
| Tritanopia (no blue cones) | #002D2F | 0.037 |
| Achromatopsia (no color) | #252525 | 0.055 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #05283D
#05283D
oklch(26.4% 0.055 240.2)
- #381E05
#381E05
oklch(26.5% 0.055 60.7)
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 #05283D, 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 0.030
- Jet #212529 ΔE 0.046
- Rich Black #0D1B2A ΔE 0.051
- Space Cadet #2B2D42 ΔE 0.054
- Gunmetal #293241 ΔE 0.059
- Marine #042E60 ΔE 0.065
- Midnight Green #073B4C ΔE 0.066
Use #05283D 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.