#284CA3
Closest named color: Cobalt (#1E488F). oklch(44.2% 0.147 264.3), rgb(40, 76, 163).
Aa
White text reads best on this color (7.91:1).
About this color
#284CA3 is a dark, vivid blue. In OKLCH its lightness is 44%, 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 0.036 away. White text reads best on it, at 7.91:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | vivid (0.147) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.65:1 |
| White text | 7.91:1 |
Values
| HEX | #284CA3 |
| RGB | rgb(40, 76, 163) |
| HSL | hsl(222, 61%, 40%) |
| OKLCH | oklch(44.2% 0.147 264.3) |
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 #284CA3 | 7.91:1 | AAA | Lc -91.8 | Preferred for body text |
| Black text on #284CA3 | 2.65:1 | Fails | Lc 17.0 | Dividers and decoration only |
| #284CA3 text on white | 7.91:1 | AAA | Lc 87.0 | Fine for body text |
| #284CA3 text on black | 2.65:1 | Fails | Lc -15.1 | 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
#F2F6FD
oklch(97.2% 0.01 261.8)
-
Step 100
100
#E2EAFB
oklch(93.6% 0.025 265.6)
-
Step 200
200
#C9DAFA
oklch(88.6% 0.048 263.1)
-
Step 300
300
#A5C0F9
oklch(80.8% 0.086 264.8)
-
Step 400
400
#759EF6
oklch(70.7% 0.137 264.3)
-
Step 500
500
#5283F2
oklch(63.2% 0.175 264.1)
-
Step 600
600
#3869E1
oklch(55.6% 0.191 264.3)
-
Step 700
700
#2B57C3
oklch(49.2% 0.176 264.2)
-
Step 800
800 (this color)
#284CA3
oklch(44.2% 0.147 264.3)
-
Step 900
900
#223D7E
oklch(37.8% 0.115 264.5)
-
Step 950
950
#142449
oklch(26.9% 0.072 264.5)
#284CA3 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) | #0E57A6 | 0.030 |
| Deuteranopia (no green cones) | #004CA1 | 0.023 |
| Tritanopia (no blue cones) | #006170 | 0.116 |
| Achromatopsia (no color) | #515151 | 0.147 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #284CA3
#284CA3
oklch(44.2% 0.147 264.3)
- #6A4E00
#6A4E00
oklch(44.2% 0.091 84.7)
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 #284CA3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.036
- Dusk Blue #26538D ΔE 0.043
- Blueberry #464196 ΔE 0.046
- Sapphire #2138AB ΔE 0.052
- Light Navy #155084 ΔE 0.056
- Denim Blue #3B5B92 ΔE 0.059
- Dark Slate Blue #483D8B ΔE 0.062
- Blue Blue #2242C7 ΔE 0.063
Use #284CA3 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.