#283A6A
Closest named color: Marine Blue (#01386A). oklch(35.9% 0.086 266.6), rgb(40, 58, 106).
Aa
White text reads best on this color (11.03:1).
About this color
#283A6A is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.086 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.034 away. White text reads best on it, at 11.03:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.086) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.90:1 |
| White text | 11.03:1 |
Values
| HEX | #283A6A |
| RGB | rgb(40, 58, 106) |
| HSL | hsl(224, 45%, 29%) |
| OKLCH | oklch(35.9% 0.086 266.6) |
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 #283A6A | 11.03:1 | AAA | Lc -99.2 | Preferred for body text |
| Black text on #283A6A | 1.90:1 | Fails | Lc 8.6 | Not readable |
| #283A6A text on white | 11.03:1 | AAA | Lc 95.3 | Preferred for body text |
| #283A6A text on black | 1.90:1 | Fails | Lc -7.3 | 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 900.
-
Step 50
50
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E4EAF7
oklch(93.6% 0.019 266)
-
Step 200
200
#CED9F2
oklch(88.5% 0.036 266.7)
-
Step 300
300
#ADC0EB
oklch(80.8% 0.065 266.3)
-
Step 400
400
#839FE2
oklch(70.8% 0.104 266.4)
-
Step 500
500
#6585D9
oklch(63.1% 0.132 266.9)
-
Step 600
600
#4C6DC7
oklch(55.5% 0.145 266.6)
-
Step 700
700
#3E5BAC
oklch(49.2% 0.134 266.7)
-
Step 800
800
#334B8B
oklch(42.8% 0.11 266.4)
-
Step 900
900 (this color)
#283A6A
oklch(35.9% 0.086 266.6)
-
Step 950
950
#1A2541
oklch(27% 0.055 266.6)
#283A6A 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) | #253F6C | 0.015 |
| Deuteranopia (no green cones) | #1C3969 | 0.015 |
| Tritanopia (no blue cones) | #00454C | 0.077 |
| Achromatopsia (no color) | #3C3C3C | 0.086 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283A6A
#283A6A
oklch(35.9% 0.086 266.6)
- #4E3A00
#4E3A00
oklch(36.1% 0.074 86.8)
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 #283A6A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.034
- Twilight Blue #0A437A ΔE 0.039
- Prussian Blue #1D3557 ΔE 0.039
- Dark Grey Blue #29465B ΔE 0.051
- Dark Blue Grey #1F3B4D ΔE 0.054
- Marine #042E60 ΔE 0.057
- Charcoal #264653 ΔE 0.062
- Midnight Green #073B4C ΔE 0.064
Use #283A6A 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.