#284575
Closest named color: Twilight Blue (#0A437A). oklch(39.3% 0.089 260), rgb(40, 69, 117).
Aa
White text reads best on this color (9.55:1).
About this color
#284575 is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.089 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.026 away. White text reads best on it, at 9.55:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.089) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.19:1 |
| White text | 9.55:1 |
Values
| HEX | #284575 |
| RGB | rgb(40, 69, 117) |
| HSL | hsl(217, 49%, 31%) |
| OKLCH | oklch(39.3% 0.089 260) |
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 #284575 | 9.55:1 | AAA | Lc -96.2 | Preferred for body text |
| Black text on #284575 | 2.19:1 | Fails | Lc 12.0 | Not readable |
| #284575 text on white | 9.55:1 | AAA | Lc 91.9 | Preferred for body text |
| #284575 text on black | 2.19:1 | Fails | Lc -10.5 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E2EAF7
oklch(93.5% 0.02 260.2)
-
Step 200
200
#CBDAF2
oklch(88.5% 0.037 259.8)
-
Step 300
300
#A8C2EC
oklch(80.9% 0.066 259.9)
-
Step 400
400
#79A1E3
oklch(70.6% 0.107 260.1)
-
Step 500
500
#5688DB
oklch(63% 0.137 260)
-
Step 600
600
#3B71C9
oklch(55.7% 0.148 259.7)
-
Step 700
700
#2E5EAE
oklch(49.2% 0.138 260)
-
Step 800
800
#274D8C
oklch(42.7% 0.113 259.9)
-
Step 900
900 (this color)
#284575
oklch(39.3% 0.089 260)
-
Step 950
950
#152642
oklch(27% 0.057 259.9)
#284575 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) | #304977 | 0.016 |
| Deuteranopia (no green cones) | #254274 | 0.010 |
| Tritanopia (no blue cones) | #005057 | 0.075 |
| Achromatopsia (no color) | #454545 | 0.089 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #284575
#284575
oklch(39.3% 0.089 260)
- #5C4000
#5C4000
oklch(39.3% 0.081 80.5)
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 #284575, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.026
- Light Navy #155084 ΔE 0.038
- Cobalt #1E488F ΔE 0.043
- Dark Grey Blue #29465B ΔE 0.046
- Deep Sea Blue #015482 ΔE 0.047
- Dusk Blue #26538D ΔE 0.052
- Marine Blue #01386A ΔE 0.056
- Charcoal #264653 ΔE 0.061
Use #284575 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.