#283B4C
Closest named color: Dark Blue Grey (#1F3B4D). oklch(34.4% 0.039 246.2), rgb(40, 59, 76).
Aa
White text reads best on this color (11.53:1).
About this color
#283B4C is a dark, muted blue. In OKLCH its lightness is 34%, its chroma 0.039 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.011 away. White text reads best on it, at 11.53:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | muted (0.039) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.82:1 |
| White text | 11.53:1 |
Values
| HEX | #283B4C |
| RGB | rgb(40, 59, 76) |
| HSL | hsl(208, 31%, 23%) |
| OKLCH | oklch(34.4% 0.039 246.2) |
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 #283B4C | 11.53:1 | AAA | Lc -100.2 | Preferred for body text |
| Black text on #283B4C | 1.82:1 | Fails | Lc 7.4 | Not readable |
| #283B4C text on white | 11.53:1 | AAA | Lc 96.5 | Preferred for body text |
| #283B4C text on black | 1.82:1 | 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
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E5EAEF
oklch(93.5% 0.009 247.9)
-
Step 200
200
#D1DAE3
oklch(88.4% 0.016 248)
-
Step 300
300
#B2C3D3
oklch(80.9% 0.029 246.5)
-
Step 400
400
#89A4BC
oklch(70.6% 0.046 245.3)
-
Step 500
500
#6C8DAC
oklch(63% 0.06 247.2)
-
Step 600
600
#537797
oklch(55.5% 0.065 246.1)
-
Step 700
700
#446481
oklch(49.1% 0.06 246.7)
-
Step 800
800
#385269
oklch(42.8% 0.05 246)
-
Step 900
900 (this color)
#283B4C
oklch(34.4% 0.039 246.2)
-
Step 950
950
#1D2832
oklch(27.1% 0.024 246.3)
#283B4C 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) | #343B4D | 0.018 |
| Deuteranopia (no green cones) | #2F374C | 0.016 |
| Tritanopia (no blue cones) | #1A3F41 | 0.032 |
| Achromatopsia (no color) | #393939 | 0.039 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283B4C
#283B4C
oklch(34.4% 0.039 246.2)
- #473523
#473523
oklch(34.4% 0.039 65.9)
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 #283B4C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.011
- Onyx #343A40 ΔE 0.025
- Midnight Green #073B4C ΔE 0.030
- Gunmetal #293241 ΔE 0.031
- Prussian Blue #1D3557 ΔE 0.035
- Charcoal #264653 ΔE 0.035
- Dark Grey Blue #29465B ΔE 0.039
- Charcoal Grey #3C4142 ΔE 0.043
Use #283B4C 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.