#284BA1
Closest named color: Cobalt (#1E488F). oklch(43.9% 0.145 264.5), rgb(40, 75, 161).
Aa
White text reads best on this color (8.04:1).
About this color
#284BA1 is a dark, vivid blue. In OKLCH its lightness is 44%, its chroma 0.145 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.032 away. White text reads best on it, at 8.04:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | vivid (0.145) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.61:1 |
| White text | 8.04:1 |
Values
| HEX | #284BA1 |
| RGB | rgb(40, 75, 161) |
| HSL | hsl(223, 60%, 39%) |
| OKLCH | oklch(43.9% 0.145 264.5) |
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 #284BA1 | 8.04:1 | AAA | Lc -92.1 | Preferred for body text |
| Black text on #284BA1 | 2.61:1 | Fails | Lc 16.6 | Dividers and decoration only |
| #284BA1 text on white | 8.04:1 | AAA | Lc 87.4 | Fine for body text |
| #284BA1 text on black | 2.61:1 | Fails | Lc -14.7 | 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
#E2EAFB
oklch(93.6% 0.025 265.6)
-
Step 200
200
#CAD9F9
oklch(88.4% 0.047 265.5)
-
Step 300
300
#A5C0F8
oklch(80.8% 0.085 264.6)
-
Step 400
400
#769EF5
oklch(70.7% 0.135 264.5)
-
Step 500
500
#5383F1
oklch(63.1% 0.173 264.3)
-
Step 600
600
#3969E0
oklch(55.6% 0.189 264.5)
-
Step 700
700
#2C57C3
oklch(49.2% 0.176 264.4)
-
Step 800
800 (this color)
#284BA1
oklch(43.9% 0.145 264.5)
-
Step 900
900
#223D7D
oklch(37.7% 0.114 264.4)
-
Step 950
950
#142449
oklch(26.9% 0.072 264.5)
#284BA1 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) | #0E56A4 | 0.031 |
| Deuteranopia (no green cones) | #004B9F | 0.023 |
| Tritanopia (no blue cones) | #00606E | 0.116 |
| Achromatopsia (no color) | #505050 | 0.146 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #284BA1
#284BA1
oklch(43.9% 0.145 264.5)
- #694D00
#694D00
oklch(43.8% 0.09 84.4)
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 #284BA1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.032
- Dusk Blue #26538D ΔE 0.042
- Blueberry #464196 ΔE 0.044
- Sapphire #2138AB ΔE 0.051
- Light Navy #155084 ΔE 0.054
- Dark Slate Blue #483D8B ΔE 0.060
- Denim Blue #3B5B92 ΔE 0.060
- Twilight #4E518B ΔE 0.064
Use #284BA1 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.