#283A4B
Closest named color: Dark Blue Grey (#1F3B4D). oklch(34.1% 0.038 247.6), rgb(40, 58, 75).
Aa
White text reads best on this color (11.68:1).
About this color
#283A4B is a dark, muted blue. In OKLCH its lightness is 34%, its chroma 0.038 and its hue 248°. 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 11.68:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | muted (0.038) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.79:1 |
| White text | 11.68:1 |
Values
| HEX | #283A4B |
| RGB | rgb(40, 58, 75) |
| HSL | hsl(209, 30%, 23%) |
| OKLCH | oklch(34.1% 0.038 247.6) |
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 #283A4B | 11.68:1 | AAA | Lc -100.5 | Preferred for body text |
| Black text on #283A4B | 1.79:1 | Fails | Lc 0.0 | Not readable |
| #283A4B text on white | 11.68:1 | AAA | Lc 96.8 | Preferred for body text |
| #283A4B text on black | 1.79:1 | 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
#E6EAEF
oklch(93.5% 0.008 253.9)
-
Step 200
200
#D1DAE3
oklch(88.4% 0.016 248)
-
Step 300
300
#B3C3D3
oklch(81% 0.029 248.2)
-
Step 400
400
#8AA4BC
oklch(70.7% 0.046 246.3)
-
Step 500
500
#6D8DAB
oklch(63% 0.058 247.1)
-
Step 600
600
#557797
oklch(55.6% 0.063 247.5)
-
Step 700
700
#456481
oklch(49.1% 0.059 247.5)
-
Step 800
800
#395269
oklch(42.8% 0.049 247)
-
Step 900
900 (this color)
#283A4B
oklch(34.1% 0.038 247.6)
-
Step 950
950
#1D2832
oklch(27.1% 0.024 246.3)
#283A4B 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) | #333A4C | 0.016 |
| Deuteranopia (no green cones) | #2F374B | 0.013 |
| Tritanopia (no blue cones) | #1B3E40 | 0.032 |
| Achromatopsia (no color) | #383838 | 0.038 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283A4B
#283A4B
oklch(34.1% 0.038 247.6)
- #453422
#453422
oklch(33.9% 0.038 67.6)
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 #283A4B, 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
- Gunmetal #293241 ΔE 0.028
- Midnight Green #073B4C ΔE 0.030
- Prussian Blue #1D3557 ΔE 0.034
- Charcoal #264653 ΔE 0.038
- Space Cadet #2B2D42 ΔE 0.041
- Dark Grey Blue #29465B ΔE 0.042
Use #283A4B 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.