#284B60
Closest named color: Dark Grey Blue (#29465B). oklch(39.6% 0.054 236.7), rgb(40, 75, 96).
Aa
White text reads best on this color (9.26:1).
About this color
#284B60 is a dark, muted blue. In OKLCH its lightness is 40%, its chroma 0.054 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.016 away. White text reads best on it, at 9.26:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | muted (0.054) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.26:1 |
| White text | 9.26:1 |
Values
| HEX | #284B60 |
| RGB | rgb(40, 75, 96) |
| HSL | hsl(203, 41%, 27%) |
| OKLCH | oklch(39.6% 0.054 236.7) |
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 #284B60 | 9.26:1 | AAA | Lc -95.6 | Preferred for body text |
| Black text on #284B60 | 2.26:1 | Fails | Lc 12.7 | Not readable |
| #284B60 text on white | 9.26:1 | AAA | Lc 91.3 | Preferred for body text |
| #284B60 text on black | 2.26:1 | Fails | Lc -11.1 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E3EBF1
oklch(93.6% 0.012 239.9)
-
Step 200
200
#CCDCE6
oklch(88.5% 0.022 235)
-
Step 300
300
#A9C5D8
oklch(80.9% 0.041 237.7)
-
Step 400
400
#7AA7C4
oklch(70.7% 0.064 237.1)
-
Step 500
500
#5591B5
oklch(63% 0.083 236.5)
-
Step 600
600
#387BA1
oklch(55.6% 0.09 236.4)
-
Step 700
700
#2A678A
oklch(49% 0.084 237.2)
-
Step 800
800
#245470
oklch(42.6% 0.07 237.2)
-
Step 900
900 (this color)
#284B60
oklch(39.6% 0.054 236.7)
-
Step 950
950
#152935
oklch(27% 0.034 236.3)
#284B60 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) | #414A61 | 0.032 |
| Deuteranopia (no green cones) | #3A4560 | 0.028 |
| Tritanopia (no blue cones) | #015052 | 0.042 |
| Achromatopsia (no color) | #474747 | 0.054 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #284B60
#284B60
oklch(39.6% 0.054 236.7)
- #5D3F29
#5D3F29
oklch(39.6% 0.054 56.7)
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 #284B60, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.016
- Charcoal #264653 ΔE 0.025
- Dark Slate Gray #2F4F4F ΔE 0.036
- Deep Teal #00555A ΔE 0.042
- Dark Teal #014D4E ΔE 0.045
- Charcoal Grey #3C4142 ΔE 0.054
- Dark Blue Grey #1F3B4D ΔE 0.058
- Deep Sea Blue #015482 ΔE 0.058
Use #284B60 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.