#284F8A
Closest named color: Dusk Blue (#26538D). oklch(43.1% 0.108 258.5), rgb(40, 79, 138).
Aa
White text reads best on this color (8.15:1).
About this color
#284F8A is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.108 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.012 away. White text reads best on it, at 8.15:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.57:1 |
| White text | 8.15:1 |
Values
| HEX | #284F8A |
| RGB | rgb(40, 79, 138) |
| HSL | hsl(216, 55%, 35%) |
| OKLCH | oklch(43.1% 0.108 258.5) |
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 #284F8A | 8.15:1 | AAA | Lc -92.6 | Preferred for body text |
| Black text on #284F8A | 2.57:1 | Fails | Lc 16.1 | Dividers and decoration only |
| #284F8A text on white | 8.15:1 | AAA | Lc 87.9 | Fine for body text |
| #284F8A text on black | 2.57:1 | Fails | Lc -14.2 | 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 800.
-
Step 50
50
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E3EAF6
oklch(93.5% 0.018 261.3)
-
Step 200
200
#CBDAF1
oklch(88.4% 0.036 258.9)
-
Step 300
300
#A8C2EA
oklch(80.8% 0.064 258.9)
-
Step 400
400
#7AA2DF
oklch(70.7% 0.1 258.6)
-
Step 500
500
#578AD6
oklch(63.2% 0.128 258.2)
-
Step 600
600
#3C72C4
oklch(55.6% 0.14 258.6)
-
Step 700
700
#2E5FA9
oklch(49.1% 0.13 258.6)
-
Step 800
800 (this color)
#284F8A
oklch(43.1% 0.108 258.5)
-
Step 900
900
#24416D
oklch(37.6% 0.084 258.5)
-
Step 950
950
#162640
oklch(26.9% 0.053 259.7)
#284F8A 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) | #33548C | 0.020 |
| Deuteranopia (no green cones) | #234B89 | 0.013 |
| Tritanopia (no blue cones) | #005D65 | 0.087 |
| Achromatopsia (no color) | #4F4F4F | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #284F8A
#284F8A
oklch(43.1% 0.108 258.5)
- #6A4900
#6A4900
oklch(43.1% 0.089 79)
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 #284F8A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.012
- Light Navy #155084 ΔE 0.018
- Cobalt #1E488F ΔE 0.026
- Deep Sea Blue #015482 ΔE 0.030
- Light Navy Blue #2E5A88 ΔE 0.035
- Denim Blue #3B5B92 ΔE 0.044
- Twilight #4E518B ΔE 0.049
- Twilight Blue #0A437A ΔE 0.051
Use #284F8A 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.