#284A8C
Closest named color: Cobalt (#1E488F). oklch(42.1% 0.117 262.1), rgb(40, 74, 140).
Aa
White text reads best on this color (8.57:1).
About this color
#284A8C is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.117 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.013 away. White text reads best on it, at 8.57:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.117) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.44:1 |
| White text | 8.57:1 |
Values
| HEX | #284A8C |
| RGB | rgb(40, 74, 140) |
| HSL | hsl(220, 56%, 35%) |
| OKLCH | oklch(42.1% 0.117 262.1) |
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 #284A8C | 8.57:1 | AAA | Lc -93.7 | Preferred for body text |
| Black text on #284A8C | 2.44:1 | Fails | Lc 14.8 | Not readable |
| #284A8C text on white | 8.57:1 | AAA | Lc 89.2 | Fine for body text |
| #284A8C text on black | 2.44:1 | Fails | Lc -13.0 | 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 800.
-
Step 50
50
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E3EAF8
oklch(93.6% 0.02 264.5)
-
Step 200
200
#CCDAF3
oklch(88.6% 0.038 262.1)
-
Step 300
300
#A9C1ED
oklch(80.8% 0.068 262.5)
-
Step 400
400
#7BA0E5
oklch(70.6% 0.11 262.3)
-
Step 500
500
#5A87DD
oklch(63.1% 0.139 262.3)
-
Step 600
600
#406FCB
oklch(55.6% 0.152 262.3)
-
Step 700
700
#325CAF
oklch(49% 0.141 262.3)
-
Step 800
800 (this color)
#284A8C
oklch(42.1% 0.117 262.1)
-
Step 900
900
#264071
oklch(37.7% 0.09 261.9)
-
Step 950
950
#162642
oklch(27% 0.057 260.9)
#284A8C 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) | #28518E | 0.020 |
| Deuteranopia (no green cones) | #14488B | 0.018 |
| Tritanopia (no blue cones) | #005964 | 0.093 |
| Achromatopsia (no color) | #4C4C4C | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #284A8C
#284A8C
oklch(42.1% 0.117 262.1)
- #644800
#644800
oklch(42.1% 0.087 83)
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 #284A8C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.013
- Dusk Blue #26538D ΔE 0.026
- Light Navy #155084 ΔE 0.027
- Deep Sea Blue #015482 ΔE 0.040
- Twilight Blue #0A437A ΔE 0.044
- Blueberry #464196 ΔE 0.047
- Light Navy Blue #2E5A88 ΔE 0.050
- Dark Slate Blue #483D8B ΔE 0.051
Use #284A8C 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.