#284582
Closest named color: Cobalt (#1E488F). oklch(40.2% 0.108 263.2), rgb(40, 69, 130).
Aa
White text reads best on this color (9.27:1).
About this color
#284582 is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.108 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.023 away. White text reads best on it, at 9.27:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.26:1 |
| White text | 9.27:1 |
Values
| HEX | #284582 |
| RGB | rgb(40, 69, 130) |
| HSL | hsl(221, 53%, 33%) |
| OKLCH | oklch(40.2% 0.108 263.2) |
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 #284582 | 9.27:1 | AAA | Lc -95.5 | Preferred for body text |
| Black text on #284582 | 2.26:1 | Fails | Lc 12.8 | Not readable |
| #284582 text on white | 9.27:1 | AAA | Lc 91.1 | Preferred for body text |
| #284582 text on black | 2.26:1 | Fails | Lc -11.2 | 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
#F2F6FD
oklch(97.2% 0.01 261.8)
-
Step 100
100
#E2EAFA
oklch(93.6% 0.023 264.5)
-
Step 200
200
#CADAF8
oklch(88.6% 0.045 263.1)
-
Step 300
300
#A5C1F6
oklch(80.9% 0.081 263)
-
Step 400
400
#759FF2
oklch(70.7% 0.131 263.1)
-
Step 500
500
#5284ED
oklch(63% 0.167 263.3)
-
Step 600
600
#386BDB
oklch(55.6% 0.18 263.3)
-
Step 700
700
#2B59BE
oklch(49.2% 0.167 263.2)
-
Step 800
800
#24499A
oklch(42.7% 0.139 263.3)
-
Step 900
900 (this color)
#284582
oklch(40.2% 0.108 263.2)
-
Step 950
950
#142548
oklch(27.1% 0.069 263.1)
#284582 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) | #274C84 | 0.020 |
| Deuteranopia (no green cones) | #164381 | 0.018 |
| Tritanopia (no blue cones) | #00535D | 0.089 |
| Achromatopsia (no color) | #474747 | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #284582
#284582
oklch(40.2% 0.108 263.2)
- #5D4300
#5D4300
oklch(40.1% 0.082 83.4)
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 #284582, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.023
- Twilight Blue #0A437A ΔE 0.029
- Light Navy #155084 ΔE 0.033
- Dusk Blue #26538D ΔE 0.042
- Deep Sea Blue #015482 ΔE 0.046
- Dark Slate Blue #483D8B ΔE 0.050
- Blueberry #464196 ΔE 0.054
- Light Navy Blue #2E5A88 ΔE 0.063
Use #284582 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.