#287EC8
Closest named color: Windows Blue (#3778BF). oklch(57.9% 0.139 249), rgb(40, 126, 200).
Aa
Black text reads best on this color (4.90:1).
About this color
#287EC8 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.139 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.020 away. Black text reads best on it, at 4.90:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.139) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.90:1 |
| White text | 4.27:1 |
Values
| HEX | #287EC8 |
| RGB | rgb(40, 126, 200) |
| HSL | hsl(208, 67%, 47%) |
| OKLCH | oklch(57.9% 0.139 249) |
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 #287EC8 | 4.27:1 | AA large text | Lc -74.7 | Content text, not long reading |
| Black text on #287EC8 | 4.90:1 | AA | Lc 34.9 | Non-text elements, placeholder text |
| #287EC8 text on white | 4.27:1 | AA large text | Lc 69.2 | Content text, not long reading |
| #287EC8 text on black | 4.90:1 | AA | Lc -32.5 | 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
#C8DCF0
oklch(88.6% 0.035 248.2)
-
Step 300
300
#A2C5E8
oklch(81% 0.062 248.6)
-
Step 400
400
#6EA6DC
oklch(70.8% 0.099 248.5)
-
Step 500
500
#448ED3
oklch(63.1% 0.128 249.1)
-
Step 600
600 (this color)
#287EC8
oklch(57.9% 0.139 249)
-
Step 700
700
#0E64A6
oklch(49.2% 0.129 248.8)
-
Step 800
800
#125186
oklch(42.6% 0.107 249.3)
-
Step 900
900
#18446C
oklch(37.8% 0.084 249.3)
-
Step 950
950
#0F283F
oklch(27% 0.053 248.7)
#287EC8 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) | #5B82CB | 0.047 |
| Deuteranopia (no green cones) | #4374C7 | 0.031 |
| Tritanopia (no blue cones) | #009099 | 0.102 |
| Achromatopsia (no color) | #7A7A7A | 0.139 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #287EC8
#287EC8
oklch(57.9% 0.139 249)
- #A96A00
#A96A00
oklch(57.9% 0.126 69.3)
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 #287EC8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.020
- Water Blue #0E87CC ΔE 0.024
- Nice Blue #107AB0 ΔE 0.040
- Steel Blue #4682B4 ΔE 0.041
- Cool Blue #4984B8 ΔE 0.042
- Flat Blue #3C73A8 ΔE 0.053
- Blue NCS #118AB2 ΔE 0.055
- Off Blue #5684AE ΔE 0.060
Use #287EC8 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.