#284B8C
Closest named color: Cobalt (#1E488F). oklch(42.3% 0.115 261.5), rgb(40, 75, 140).
Aa
White text reads best on this color (8.48:1).
About this color
#284B8C is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.115 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.015 away. White text reads best on it, at 8.48:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.115) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.47:1 |
| White text | 8.48:1 |
Values
| HEX | #284B8C |
| RGB | rgb(40, 75, 140) |
| HSL | hsl(219, 56%, 35%) |
| OKLCH | oklch(42.3% 0.115 261.5) |
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 #284B8C | 8.48:1 | AAA | Lc -93.5 | Preferred for body text |
| Black text on #284B8C | 2.47:1 | Fails | Lc 15.1 | Dividers and decoration only |
| #284B8C text on white | 8.48:1 | AAA | Lc 88.9 | Fine for body text |
| #284B8C text on black | 2.47:1 | Fails | Lc -13.3 | 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 800.
-
Step 50
50
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E3EAF7
oklch(93.6% 0.019 263)
-
Step 200
200
#CCDAF3
oklch(88.6% 0.038 262.1)
-
Step 300
300
#A9C2ED
oklch(81% 0.067 261.2)
-
Step 400
400
#7BA1E4
oklch(70.8% 0.107 261.3)
-
Step 500
500
#5987DC
oklch(63% 0.138 261.7)
-
Step 600
600
#3F70CA
oklch(55.7% 0.149 261.4)
-
Step 700
700
#315DAF
oklch(49.2% 0.14 261.5)
-
Step 800
800 (this color)
#284B8C
oklch(42.3% 0.115 261.5)
-
Step 900
900
#254071
oklch(37.7% 0.09 261.4)
-
Step 950
950
#162642
oklch(27% 0.057 260.9)
#284B8C 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) | #2A528E | 0.021 |
| Deuteranopia (no green cones) | #17488B | 0.018 |
| Tritanopia (no blue cones) | #005A64 | 0.093 |
| Achromatopsia (no color) | #4D4D4D | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #284B8C
#284B8C
oklch(42.3% 0.115 261.5)
- #664800
#664800
oklch(42.3% 0.087 81.3)
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 #284B8C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.015
- Dusk Blue #26538D ΔE 0.023
- Light Navy #155084 ΔE 0.025
- Deep Sea Blue #015482 ΔE 0.038
- Twilight Blue #0A437A ΔE 0.046
- Light Navy Blue #2E5A88 ΔE 0.047
- Blueberry #464196 ΔE 0.048
- Dark Slate Blue #483D8B ΔE 0.052
Use #284B8C 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.