#284CBB
Closest named color: Blue Blue (#2242C7). oklch(46.2% 0.18 265.8), rgb(40, 76, 187).
Aa
White text reads best on this color (7.39:1).
About this color
#284CBB is a medium-dark, vivid blue. In OKLCH its lightness is 46%, its chroma 0.180 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Blue (#2242C7), ΔE 0.030 away. White text reads best on it, at 7.39:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.180) |
| Temperature | cool |
| Nearest name | Blue Blue (#2242C7) |
| Black text | 2.84:1 |
| White text | 7.39:1 |
Values
| HEX | #284CBB |
| RGB | rgb(40, 76, 187) |
| HSL | hsl(225, 65%, 45%) |
| OKLCH | oklch(46.2% 0.18 265.8) |
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 #284CBB | 7.39:1 | AAA | Lc -90.0 | Fine for body text |
| Black text on #284CBB | 2.84:1 | Fails | Lc 19.0 | Dividers and decoration only |
| #284CBB text on white | 7.39:1 | AAA | Lc 85.1 | Fine for body text |
| #284CBB text on black | 2.84:1 | Fails | Lc -16.9 | 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 700.
-
Step 50
50
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E2EAFB
oklch(93.6% 0.025 265.6)
-
Step 200
200
#CAD9FA
oklch(88.5% 0.048 266)
-
Step 300
300
#A6C0FA
oklch(80.9% 0.087 265.8)
-
Step 400
400
#779DF7
oklch(70.7% 0.139 265.7)
-
Step 500
500
#5681F4
oklch(63.1% 0.178 266)
-
Step 600
600
#3D67E2
oklch(55.5% 0.193 266)
-
Step 700
700 (this color)
#284CBB
oklch(46.2% 0.18 265.8)
-
Step 800
800
#27469F
oklch(42.6% 0.149 265.8)
-
Step 900
900
#243C7E
oklch(37.6% 0.116 266)
-
Step 950
950
#15244A
oklch(27% 0.073 265.6)
#284CBB 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) | #005DBF | 0.043 |
| Deuteranopia (no green cones) | #004FB9 | 0.021 |
| Tritanopia (no blue cones) | #00687C | 0.140 |
| Achromatopsia (no color) | #565656 | 0.180 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #284CBB
#284CBB
oklch(46.2% 0.18 265.8)
- #705400
#705400
oklch(46.2% 0.095 86.2)
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 #284CBB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Blue #2242C7 ΔE 0.030
- Majorelle Blue #3F37C9 ΔE 0.051
- Sapphire #2138AB ΔE 0.055
- Blue With A Hint Of Purple #533CC6 ΔE 0.062
- Blurple #5539CC ΔE 0.069
- Blueberry #464196 ΔE 0.071
- Warm Blue #4B57DB ΔE 0.072
- Cobalt #1E488F ΔE 0.073
Use #284CBB 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.