#284F90
Closest named color: Dusk Blue (#26538D). oklch(43.5% 0.116 260), rgb(40, 79, 144).
Aa
White text reads best on this color (8.04:1).
About this color
#284F90 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 0.013 away. White text reads best on it, at 8.04:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.61:1 |
| White text | 8.04:1 |
Values
| HEX | #284F90 |
| RGB | rgb(40, 79, 144) |
| HSL | hsl(218, 57%, 36%) |
| OKLCH | oklch(43.5% 0.116 260) |
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 #284F90 | 8.04:1 | AAA | Lc -92.3 | Preferred for body text |
| Black text on #284F90 | 2.61:1 | Fails | Lc 16.4 | Dividers and decoration only |
| #284F90 text on white | 8.04:1 | AAA | Lc 87.6 | Fine for body text |
| #284F90 text on black | 2.61:1 | Fails | Lc -14.6 | 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
#A7C2ED
oklch(80.9% 0.068 259.6)
-
Step 400
400
#78A1E4
oklch(70.6% 0.109 259.9)
-
Step 500
500
#5588DD
oklch(63.1% 0.14 260.1)
-
Step 600
600
#3A70CA
oklch(55.5% 0.151 260)
-
Step 700
700
#2D5EAF
oklch(49.2% 0.14 259.9)
-
Step 800
800 (this color)
#284F90
oklch(43.5% 0.116 260)
-
Step 900
900
#234071
oklch(37.6% 0.091 260.3)
-
Step 950
950
#152642
oklch(27% 0.057 259.9)
#284F90 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) | #2F5592 | 0.020 |
| Deuteranopia (no green cones) | #1C4C8F | 0.015 |
| Tritanopia (no blue cones) | #005E68 | 0.093 |
| Achromatopsia (no color) | #505050 | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #284F90
#284F90
oklch(43.5% 0.116 260)
- #6B4A00
#6B4A00
oklch(43.4% 0.09 79.3)
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 #284F90, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.013
- Cobalt #1E488F ΔE 0.023
- Light Navy #155084 ΔE 0.026
- Deep Sea Blue #015482 ΔE 0.037
- Light Navy Blue #2E5A88 ΔE 0.039
- Denim Blue #3B5B92 ΔE 0.043
- Twilight #4E518B ΔE 0.049
- Blueberry #464196 ΔE 0.051
Use #284F90 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.