#287DC6
Closest named color: Windows Blue (#3778BF). oklch(57.6% 0.138 248.9), rgb(40, 125, 198).
Aa
Black text reads best on this color (4.83:1).
About this color
#287DC6 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.138 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.017 away. Black text reads best on it, at 4.83:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.138) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.83:1 |
| White text | 4.33:1 |
Values
| HEX | #287DC6 |
| RGB | rgb(40, 125, 198) |
| HSL | hsl(208, 66%, 47%) |
| OKLCH | oklch(57.6% 0.138 248.9) |
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 #287DC6 | 4.33:1 | AA large text | Lc -75.1 | Fine for body text |
| Black text on #287DC6 | 4.83:1 | AA | Lc 34.4 | Non-text elements, placeholder text |
| #287DC6 text on white | 4.33:1 | AA large text | Lc 69.6 | Content text, not long reading |
| #287DC6 text on black | 4.83:1 | AA | Lc -32.0 | 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
#C8DCEF
oklch(88.5% 0.034 246.8)
-
Step 300
300
#A2C5E8
oklch(81% 0.062 248.6)
-
Step 400
400
#6EA6DC
oklch(70.8% 0.099 248.5)
-
Step 500
500
#458ED2
oklch(63.1% 0.126 249)
-
Step 600
600 (this color)
#287DC6
oklch(57.6% 0.138 248.9)
-
Step 700
700
#1064A5
oklch(49.2% 0.127 248.6)
-
Step 800
800
#135286
oklch(42.8% 0.106 248.7)
-
Step 900
900
#18446B
oklch(37.7% 0.082 248.7)
-
Step 950
950
#10283F
oklch(27% 0.053 249.5)
#287DC6 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) | #5A81C9 | 0.046 |
| Deuteranopia (no green cones) | #4373C5 | 0.031 |
| Tritanopia (no blue cones) | #008E98 | 0.099 |
| Achromatopsia (no color) | #797979 | 0.138 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #287DC6
#287DC6
oklch(57.6% 0.138 248.9)
- #A86900
#A86900
oklch(57.6% 0.126 69.1)
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 #287DC6, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.017
- Water Blue #0E87CC ΔE 0.027
- Nice Blue #107AB0 ΔE 0.037
- Steel Blue #4682B4 ΔE 0.041
- Cool Blue #4984B8 ΔE 0.042
- Flat Blue #3C73A8 ΔE 0.049
- Blue NCS #118AB2 ΔE 0.054
- French Blue #436BAD ΔE 0.057
Use #287DC6 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.