#287CBA
Closest named color: Windows Blue (#3778BF). oklch(56.7% 0.124 245.3), rgb(40, 124, 186).
Aa
Black text reads best on this color (4.68:1).
About this color
#287CBA is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.124 and its hue 245°. 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 4.68:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.124) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.68:1 |
| White text | 4.48:1 |
Values
| HEX | #287CBA |
| RGB | rgb(40, 124, 186) |
| HSL | hsl(205, 65%, 44%) |
| OKLCH | oklch(56.7% 0.124 245.3) |
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 #287CBA | 4.48:1 | AA large text | Lc -76.2 | Fine for body text |
| Black text on #287CBA | 4.68:1 | AA | Lc 33.3 | Non-text elements, placeholder text |
| #287CBA text on white | 4.48:1 | AA large text | Lc 70.8 | Content text, not long reading |
| #287CBA text on black | 4.68:1 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E1EBF4
oklch(93.5% 0.016 245.1)
-
Step 200
200
#C9DCED
oklch(88.6% 0.031 245.1)
-
Step 300
300
#A3C5E3
oklch(80.9% 0.056 245.2)
-
Step 400
400
#70A7D5
oklch(70.8% 0.089 244.8)
-
Step 500
500
#4790CA
oklch(63.2% 0.114 245)
-
Step 600
600 (this color)
#287CBA
oklch(56.7% 0.124 245.3)
-
Step 700
700
#15659D
oklch(49% 0.115 245.5)
-
Step 800
800
#16537F
oklch(42.7% 0.095 245)
-
Step 900
900
#1A4566
oklch(37.7% 0.074 244.9)
-
Step 950
950
#11293C
oklch(27.2% 0.047 244.6)
#287CBA 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) | #5F7EBD | 0.051 |
| Deuteranopia (no green cones) | #4A71B9 | 0.037 |
| Tritanopia (no blue cones) | #008B92 | 0.088 |
| Achromatopsia (no color) | #777777 | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #287CBA
#287CBA
oklch(56.7% 0.124 245.3)
- #A7650A
#A7650A
oklch(56.7% 0.124 65.6)
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 #287CBA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.017
- Nice Blue #107AB0 ΔE 0.020
- Steel Blue #4682B4 ΔE 0.033
- Flat Blue #3C73A8 ΔE 0.034
- Water Blue #0E87CC ΔE 0.036
- Cool Blue #4984B8 ΔE 0.037
- Blue NCS #118AB2 ΔE 0.045
- Muted Blue #3B719F ΔE 0.046
Use #287CBA 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.