#284789
Closest named color: Cobalt (#1E488F). oklch(41.2% 0.116 263.3), rgb(40, 71, 137).
Aa
White text reads best on this color (8.92:1).
About this color
#284789 is a dark, moderately saturated blue. In OKLCH its lightness is 41%, its chroma 0.116 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.013 away. White text reads best on it, at 8.92:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.35:1 |
| White text | 8.92:1 |
Values
| HEX | #284789 |
| RGB | rgb(40, 71, 137) |
| HSL | hsl(221, 55%, 35%) |
| OKLCH | oklch(41.2% 0.116 263.3) |
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 #284789 | 8.92:1 | AAA | Lc -94.6 | Preferred for body text |
| Black text on #284789 | 2.35:1 | Fails | Lc 13.8 | Not readable |
| #284789 text on white | 8.92:1 | AAA | Lc 90.2 | Preferred for body text |
| #284789 text on black | 2.35:1 | Fails | Lc -12.1 | 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
#E3EAF7
oklch(93.6% 0.019 263)
-
Step 200
200
#CCDAF3
oklch(88.6% 0.038 262.1)
-
Step 300
300
#AAC1ED
oklch(80.9% 0.067 263.3)
-
Step 400
400
#7DA0E5
oklch(70.8% 0.109 263.3)
-
Step 500
500
#5C87DD
oklch(63.2% 0.138 263)
-
Step 600
600
#436ECB
oklch(55.5% 0.152 263.6)
-
Step 700
700
#355CAF
oklch(49.1% 0.14 263.3)
-
Step 800
800 (this color)
#284789
oklch(41.2% 0.116 263.3)
-
Step 900
900
#273F71
oklch(37.5% 0.091 263.3)
-
Step 950
950
#172542
oklch(26.8% 0.058 263.5)
#284789 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) | #254E8B | 0.020 |
| Deuteranopia (no green cones) | #104588 | 0.021 |
| Tritanopia (no blue cones) | #005661 | 0.094 |
| Achromatopsia (no color) | #4A4A4A | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #284789
#284789
oklch(41.2% 0.116 263.3)
- #614600
#614600
oklch(41.3% 0.085 83.4)
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 #284789, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.013
- Light Navy #155084 ΔE 0.030
- Dusk Blue #26538D ΔE 0.034
- Twilight Blue #0A437A ΔE 0.038
- Deep Sea Blue #015482 ΔE 0.045
- Blueberry #464196 ΔE 0.047
- Dark Slate Blue #483D8B ΔE 0.048
- Light Navy Blue #2E5A88 ΔE 0.058
Use #284789 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.