#284D9E
Closest named color: Cobalt (#1E488F). oklch(44.1% 0.139 263.3), rgb(40, 77, 158).
Aa
White text reads best on this color (7.93:1).
About this color
#284D9E is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.139 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.030 away. White text reads best on it, at 7.93:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.139) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.64:1 |
| White text | 7.93:1 |
Values
| HEX | #284D9E |
| RGB | rgb(40, 77, 158) |
| HSL | hsl(221, 60%, 39%) |
| OKLCH | oklch(44.1% 0.139 263.3) |
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 #284D9E | 7.93:1 | AAA | Lc -91.9 | Preferred for body text |
| Black text on #284D9E | 2.64:1 | Fails | Lc 16.9 | Dividers and decoration only |
| #284D9E text on white | 7.93:1 | AAA | Lc 87.1 | Fine for body text |
| #284D9E text on black | 2.64:1 | Fails | Lc -15.0 | 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
#F2F6FD
oklch(97.2% 0.01 261.8)
-
Step 100
100
#E2EAFA
oklch(93.6% 0.023 264.5)
-
Step 200
200
#CADAF8
oklch(88.6% 0.045 263.1)
-
Step 300
300
#A6C1F6
oklch(81% 0.081 263.6)
-
Step 400
400
#769FF1
oklch(70.7% 0.129 263.3)
-
Step 500
500
#5384ED
oklch(63.1% 0.167 263.5)
-
Step 600
600
#386BDB
oklch(55.6% 0.18 263.3)
-
Step 700
700
#2B59BE
oklch(49.2% 0.167 263.2)
-
Step 800
800 (this color)
#284D9E
oklch(44.1% 0.139 263.3)
-
Step 900
900
#223E7A
oklch(37.7% 0.108 263.3)
-
Step 950
950
#142548
oklch(27.1% 0.069 263.1)
#284D9E 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) | #1C57A1 | 0.027 |
| Deuteranopia (no green cones) | #004C9C | 0.024 |
| Tritanopia (no blue cones) | #00606E | 0.109 |
| Achromatopsia (no color) | #515151 | 0.139 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #284D9E
#284D9E
oklch(44.1% 0.139 263.3)
- #6A4D00
#6A4D00
oklch(44% 0.09 83.6)
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 #284D9E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.030
- Dusk Blue #26538D ΔE 0.035
- Blueberry #464196 ΔE 0.045
- Light Navy #155084 ΔE 0.048
- Denim Blue #3B5B92 ΔE 0.053
- Light Navy Blue #2E5A88 ΔE 0.057
- Deep Sea Blue #015482 ΔE 0.058
- Sapphire #2138AB ΔE 0.058
Use #284D9E 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.