#283659
Closest named color: Prussian Blue (#1D3557). oklch(33.8% 0.065 266.5), rgb(40, 54, 89).
Aa
White text reads best on this color (11.91:1).
About this color
#283659 is a dark, muted blue. In OKLCH its lightness is 34%, its chroma 0.065 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.015 away. White text reads best on it, at 11.91:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | muted (0.065) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.76:1 |
| White text | 11.91:1 |
Values
| HEX | #283659 |
| RGB | rgb(40, 54, 89) |
| HSL | hsl(223, 38%, 25%) |
| OKLCH | oklch(33.8% 0.065 266.5) |
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 #283659 | 11.91:1 | AAA | Lc -100.8 | Preferred for body text |
| Black text on #283659 | 1.76:1 | Fails | Lc 0.0 | Not readable |
| #283659 text on white | 11.91:1 | AAA | Lc 97.2 | Preferred for body text |
| #283659 text on black | 1.76:1 | 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
#D1D9EC
oklch(88.5% 0.028 267.5)
-
Step 300
300
#B2C0E1
oklch(80.8% 0.049 267.1)
-
Step 400
400
#8AA0D2
oklch(70.7% 0.078 266)
-
Step 500
500
#6E87C6
oklch(63% 0.1 267)
-
Step 600
600
#5670B2
oklch(55.5% 0.108 266.6)
-
Step 700
700
#465E9A
oklch(49.1% 0.101 266.3)
-
Step 800
800
#3A4D7C
oklch(42.7% 0.082 266.3)
-
Step 900
900 (this color)
#283659
oklch(33.8% 0.065 266.5)
-
Step 950
950
#1D263B
oklch(27.1% 0.041 266)
#283659 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) | #28395A | 0.009 |
| Deuteranopia (no green cones) | #233558 | 0.008 |
| Tritanopia (no blue cones) | #123E43 | 0.059 |
| Achromatopsia (no color) | #373737 | 0.065 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283659
#283659
oklch(33.8% 0.065 266.5)
- #463506
#463506
oklch(33.9% 0.065 87.1)
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 #283659, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.015
- Dark Blue Grey #1F3B4D ΔE 0.032
- Marine Blue #01386A ΔE 0.042
- Gunmetal #293241 ΔE 0.042
- Midnight Green #073B4C ΔE 0.044
- Space Cadet #2B2D42 ΔE 0.044
- Marine #042E60 ΔE 0.049
- Dark Grey Blue #29465B ΔE 0.051
Use #283659 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.