#283B60
Closest named color: Prussian Blue (#1D3557). oklch(35.5% 0.069 262.7), rgb(40, 59, 96).
Aa
White text reads best on this color (11.14:1).
About this color
#283B60 is a dark, muted blue. In OKLCH its lightness is 36%, its chroma 0.069 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.028 away. White text reads best on it, at 11.14:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | muted (0.069) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.88:1 |
| White text | 11.14:1 |
Values
| HEX | #283B60 |
| RGB | rgb(40, 59, 96) |
| HSL | hsl(220, 41%, 27%) |
| OKLCH | oklch(35.5% 0.069 262.7) |
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 #283B60 | 11.14:1 | AAA | Lc -99.4 | Preferred for body text |
| Black text on #283B60 | 1.88:1 | Fails | Lc 8.3 | Not readable |
| #283B60 text on white | 11.14:1 | AAA | Lc 95.6 | Preferred for body text |
| #283B60 text on black | 1.88:1 | 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
#F3F5FA
oklch(97% 0.007 268.5)
-
Step 100
100
#E5EAF4
oklch(93.6% 0.015 264.5)
-
Step 200
200
#CFDAED
oklch(88.6% 0.029 261.5)
-
Step 300
300
#AFC1E3
oklch(80.9% 0.052 263.1)
-
Step 400
400
#85A1D5
oklch(70.7% 0.083 262.5)
-
Step 500
500
#6789CA
oklch(63.2% 0.106 262.6)
-
Step 600
600
#4E71B7
oklch(55.5% 0.117 263)
-
Step 700
700
#3F5F9D
oklch(49.1% 0.107 262.5)
-
Step 800
800
#344E7F
oklch(42.8% 0.088 262.1)
-
Step 900
900 (this color)
#283B60
oklch(35.5% 0.069 262.7)
-
Step 950
950
#1B263C
oklch(27% 0.044 263.4)
#283B60 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) | #2C3E62 | 0.012 |
| Deuteranopia (no green cones) | #25395F | 0.008 |
| Tritanopia (no blue cones) | #084349 | 0.061 |
| Achromatopsia (no color) | #3B3B3B | 0.069 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283B60
#283B60
oklch(35.5% 0.069 262.7)
- #4D3806
#4D3806
oklch(35.5% 0.069 83.4)
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 #283B60, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.028
- Dark Blue Grey #1F3B4D ΔE 0.037
- Dark Grey Blue #29465B ΔE 0.039
- Marine Blue #01386A ΔE 0.039
- Charcoal #264653 ΔE 0.047
- Midnight Green #073B4C ΔE 0.049
- Twilight Blue #0A437A ΔE 0.049
- Gunmetal #293241 ΔE 0.056
Use #283B60 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.