#284E8F
Closest named color: Dusk Blue (#26538D). oklch(43.2% 0.116 260.4), rgb(40, 78, 143).
Aa
White text reads best on this color (8.15:1).
About this color
#284E8F is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.116 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.015 away. White text reads best on it, at 8.15:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.57:1 |
| White text | 8.15:1 |
Values
| HEX | #284E8F |
| RGB | rgb(40, 78, 143) |
| HSL | hsl(218, 56%, 36%) |
| OKLCH | oklch(43.2% 0.116 260.4) |
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 #284E8F | 8.15:1 | AAA | Lc -92.6 | Preferred for body text |
| Black text on #284E8F | 2.57:1 | Fails | Lc 16.1 | Dividers and decoration only |
| #284E8F text on white | 8.15:1 | AAA | Lc 87.9 | Fine for body text |
| #284E8F text on black | 2.57:1 | Fails | Lc -14.3 | 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
#E2EAF7
oklch(93.5% 0.02 260.2)
-
Step 200
200
#CBDAF3
oklch(88.5% 0.038 260.7)
-
Step 300
300
#A8C2ED
oklch(80.9% 0.067 260.4)
-
Step 400
400
#79A1E4
oklch(70.7% 0.108 260.4)
-
Step 500
500
#5688DC
oklch(63% 0.138 260.2)
-
Step 600
600
#3B70CA
oklch(55.6% 0.151 260.3)
-
Step 700
700
#2E5DAF
oklch(49.1% 0.141 260.7)
-
Step 800
800 (this color)
#284E8F
oklch(43.2% 0.116 260.4)
-
Step 900
900
#244071
oklch(37.6% 0.091 260.8)
-
Step 950
950
#152642
oklch(27% 0.057 259.9)
#284E8F 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) | #2E5491 | 0.019 |
| Deuteranopia (no green cones) | #1B4B8E | 0.015 |
| Tritanopia (no blue cones) | #005D67 | 0.093 |
| Achromatopsia (no color) | #4F4F4F | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #284E8F
#284E8F
oklch(43.2% 0.116 260.4)
- #694A00
#694A00
oklch(43.2% 0.089 81)
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 #284E8F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.015
- Cobalt #1E488F ΔE 0.021
- Light Navy #155084 ΔE 0.025
- Deep Sea Blue #015482 ΔE 0.037
- Light Navy Blue #2E5A88 ΔE 0.041
- Denim Blue #3B5B92 ΔE 0.046
- Blueberry #464196 ΔE 0.050
- Twilight #4E518B ΔE 0.050
Use #284E8F 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.