#284EA5
Closest named color: Cobalt (#1E488F). oklch(44.8% 0.147 263.7), rgb(40, 78, 165).
Aa
White text reads best on this color (7.71:1).
About this color
#284EA5 is a dark, vivid blue. In OKLCH its lightness is 45%, its chroma 0.147 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.041 away. White text reads best on it, at 7.71:1.
| Hue family | Blues |
| Lightness | dark (45%) |
| Chroma | vivid (0.147) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.72:1 |
| White text | 7.71:1 |
Values
| HEX | #284EA5 |
| RGB | rgb(40, 78, 165) |
| HSL | hsl(222, 61%, 40%) |
| OKLCH | oklch(44.8% 0.147 263.7) |
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 #284EA5 | 7.71:1 | AAA | Lc -91.1 | Preferred for body text |
| Black text on #284EA5 | 2.72:1 | Fails | Lc 17.7 | Dividers and decoration only |
| #284EA5 text on white | 7.71:1 | AAA | Lc 86.4 | Fine for body text |
| #284EA5 text on black | 2.72:1 | Fails | Lc -15.7 | Dividers and decoration only |
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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EAFB
oklch(93.5% 0.025 263.3)
-
Step 200
200
#C9DAFA
oklch(88.6% 0.048 263.1)
-
Step 300
300
#A4C1F9
oklch(81% 0.086 263.3)
-
Step 400
400
#749EF6
oklch(70.7% 0.137 263.9)
-
Step 500
500
#5083F2
oklch(63.1% 0.175 263.6)
-
Step 600
600
#3669E1
oklch(55.5% 0.191 263.9)
-
Step 700
700
#2957C4
oklch(49.2% 0.178 263.8)
-
Step 800
800 (this color)
#284EA5
oklch(44.8% 0.147 263.7)
-
Step 900
900
#203D7E
oklch(37.7% 0.116 263.7)
-
Step 950
950
#13244A
oklch(26.9% 0.074 264)
#284EA5 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) | #1359A8 | 0.030 |
| Deuteranopia (no green cones) | #004DA3 | 0.023 |
| Tritanopia (no blue cones) | #006372 | 0.116 |
| Achromatopsia (no color) | #535353 | 0.147 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #284EA5
#284EA5
oklch(44.8% 0.147 263.7)
- #6D4F00
#6D4F00
oklch(44.8% 0.092 83.3)
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 #284EA5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.041
- Dusk Blue #26538D ΔE 0.044
- Blueberry #464196 ΔE 0.050
- Sapphire #2138AB ΔE 0.056
- Denim Blue #3B5B92 ΔE 0.056
- Light Navy #155084 ΔE 0.058
- Blue Blue #2242C7 ΔE 0.062
- Light Navy Blue #2E5A88 ΔE 0.063
Use #284EA5 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.