#283B5D
Closest named color: Prussian Blue (#1D3557). oklch(35.3% 0.064 261.4), rgb(40, 59, 93).
Aa
White text reads best on this color (11.20:1).
About this color
#283B5D is a dark, muted blue. In OKLCH its lightness is 35%, its chroma 0.064 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.026 away. White text reads best on it, at 11.20:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | muted (0.064) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.87:1 |
| White text | 11.20:1 |
Values
| HEX | #283B5D |
| RGB | rgb(40, 59, 93) |
| HSL | hsl(218, 40%, 26%) |
| OKLCH | oklch(35.3% 0.064 261.4) |
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 #283B5D | 11.20:1 | AAA | Lc -99.6 | Preferred for body text |
| Black text on #283B5D | 1.87:1 | Fails | Lc 8.1 | Not readable |
| #283B5D text on white | 11.20:1 | AAA | Lc 95.8 | Preferred for body text |
| #283B5D text on black | 1.87:1 | 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 900.
-
Step 50
50
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E5EAF4
oklch(93.6% 0.015 264.5)
-
Step 200
200
#CFDAEB
oklch(88.5% 0.026 259)
-
Step 300
300
#AFC1E1
oklch(80.8% 0.05 262)
-
Step 400
400
#86A1D1
oklch(70.6% 0.077 261.7)
-
Step 500
500
#6889C5
oklch(63% 0.098 261.9)
-
Step 600
600
#4F72B2
oklch(55.5% 0.108 261.7)
-
Step 700
700
#406099
oklch(49.2% 0.099 261.2)
-
Step 800
800
#354E7C
oklch(42.6% 0.083 261.8)
-
Step 900
900 (this color)
#283B5D
oklch(35.3% 0.064 261.4)
-
Step 950
950
#1B263A
oklch(26.9% 0.041 261.9)
#283B5D 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) | #2E3E5E | 0.013 |
| Deuteranopia (no green cones) | #27395C | 0.007 |
| Tritanopia (no blue cones) | #0C4247 | 0.058 |
| Achromatopsia (no color) | #3B3B3B | 0.064 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283B5D
#283B5D
oklch(35.3% 0.064 261.4)
- #4C370C
#4C370C
oklch(35.2% 0.064 81.1)
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 #283B5D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.026
- Dark Blue Grey #1F3B4D ΔE 0.032
- Dark Grey Blue #29465B ΔE 0.037
- Marine Blue #01386A ΔE 0.042
- Charcoal #264653 ΔE 0.044
- Midnight Green #073B4C ΔE 0.045
- Gunmetal #293241 ΔE 0.051
- Onyx #343A40 ΔE 0.052
Use #283B5D 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.