#284F73
Closest named color: Light Navy (#155084). oklch(41.6% 0.075 248.3), rgb(40, 79, 115).
Aa
White text reads best on this color (8.54:1).
About this color
#284F73 is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.075 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Light Navy (#155084), ΔE 0.030 away. White text reads best on it, at 8.54:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.075) |
| Temperature | cool |
| Nearest name | Light Navy (#155084) |
| Black text | 2.45:1 |
| White text | 8.54:1 |
Values
| HEX | #284F73 |
| RGB | rgb(40, 79, 115) |
| HSL | hsl(209, 48%, 30%) |
| OKLCH | oklch(41.6% 0.075 248.3) |
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 #284F73 | 8.54:1 | AAA | Lc -93.8 | Preferred for body text |
| Black text on #284F73 | 2.45:1 | Fails | Lc 14.8 | Not readable |
| #284F73 text on white | 8.54:1 | AAA | Lc 89.2 | Fine for body text |
| #284F73 text on black | 2.45:1 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E3EBF2
oklch(93.6% 0.013 244.3)
-
Step 200
200
#CDDBE9
oklch(88.5% 0.025 248.1)
-
Step 300
300
#ABC4DC
oklch(80.9% 0.044 247.3)
-
Step 400
400
#7EA5CB
oklch(70.7% 0.07 248.2)
-
Step 500
500
#5C8EBD
oklch(63.1% 0.089 247.9)
-
Step 600
600
#4177AA
oklch(55.5% 0.098 248.8)
-
Step 700
700
#336492
oklch(49.1% 0.091 248.8)
-
Step 800
800 (this color)
#284F73
oklch(41.6% 0.075 248.3)
-
Step 900
900
#27445F
oklch(37.7% 0.058 248)
-
Step 950
950
#172838
oklch(27% 0.038 247.9)
#284F73 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) | #3F5075 | 0.028 |
| Deuteranopia (no green cones) | #354972 | 0.021 |
| Tritanopia (no blue cones) | #00575C | 0.058 |
| Achromatopsia (no color) | #4C4C4C | 0.075 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #284F73
#284F73
oklch(41.6% 0.075 248.3)
- #674419
#674419
oklch(41.8% 0.075 68.4)
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 #284F73, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Light Navy #155084 ΔE 0.030
- Deep Sea Blue #015482 ΔE 0.031
- Dusk Blue #26538D ΔE 0.043
- Dark Grey Blue #29465B ΔE 0.044
- Light Navy Blue #2E5A88 ΔE 0.045
- YInMn Blue #415A77 ΔE 0.048
- Twilight Blue #0A437A ΔE 0.049
- Cobalt #1E488F ΔE 0.056
Use #284F73 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.