#287AC4
Closest named color: Windows Blue (#3778BF). oklch(56.8% 0.138 250), rgb(40, 122, 196).
Aa
Black text reads best on this color (4.67:1).
About this color
#287AC4 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.138 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.012 away. Black text reads best on it, at 4.67:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.138) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.67:1 |
| White text | 4.49:1 |
Values
| HEX | #287AC4 |
| RGB | rgb(40, 122, 196) |
| HSL | hsl(208, 66%, 46%) |
| OKLCH | oklch(56.8% 0.138 250) |
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 #287AC4 | 4.49:1 | AA large text | Lc -76.3 | Fine for body text |
| Black text on #287AC4 | 4.67:1 | AA | Lc 33.3 | Non-text elements, placeholder text |
| #287AC4 text on white | 4.49:1 | AA large text | Lc 70.8 | Content text, not long reading |
| #287AC4 text on black | 4.67:1 | AA | Lc -30.9 | Non-text elements, placeholder text |
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 600.
-
Step 50
50
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF6
oklch(93.6% 0.018 250.6)
-
Step 200
200
#C9DBF0
oklch(88.4% 0.035 252.3)
-
Step 300
300
#A3C4E8
oklch(80.8% 0.062 250.8)
-
Step 400
400
#6FA5DC
oklch(70.6% 0.099 249.8)
-
Step 500
500
#468ED3
oklch(63.2% 0.127 249.7)
-
Step 600
600 (this color)
#287AC4
oklch(56.8% 0.138 250)
-
Step 700
700
#1463A6
oklch(49.1% 0.129 250)
-
Step 800
800
#155186
oklch(42.6% 0.106 249.9)
-
Step 900
900
#1A446C
oklch(37.8% 0.083 250)
-
Step 950
950
#10283F
oklch(27% 0.053 249.5)
#287AC4 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) | #577EC7 | 0.044 |
| Deuteranopia (no green cones) | #3F70C3 | 0.029 |
| Tritanopia (no blue cones) | #008C95 | 0.102 |
| Achromatopsia (no color) | #777777 | 0.138 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #287AC4
#287AC4
oklch(56.8% 0.138 250)
- #A46700
#A46700
oklch(56.7% 0.123 69.5)
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 #287AC4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.012
- Nice Blue #107AB0 ΔE 0.034
- Water Blue #0E87CC ΔE 0.035
- Flat Blue #3C73A8 ΔE 0.044
- Steel Blue #4682B4 ΔE 0.044
- Cool Blue #4984B8 ΔE 0.047
- Mid Blue #276AB3 ΔE 0.049
- French Blue #436BAD ΔE 0.050
Use #287AC4 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.