#427DCE
Closest named color: Windows Blue (#3778BF). oklch(58.9% 0.139 256.9), rgb(66, 125, 206).
Aa
Black text reads best on this color (5.05:1).
About this color
#427DCE is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.139 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.028 away. Black text reads best on it, at 5.05:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.139) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 5.05:1 |
| White text | 4.15:1 |
Values
| HEX | #427DCE |
| RGB | rgb(66, 125, 206) |
| HSL | hsl(215, 59%, 53%) |
| OKLCH | oklch(58.9% 0.139 256.9) |
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 #427DCE | 4.15:1 | AA large text | Lc -73.8 | Content text, not long reading |
| Black text on #427DCE | 5.05:1 | AA | Lc 35.8 | Non-text elements, placeholder text |
| #427DCE text on white | 4.15:1 | AA large text | Lc 68.3 | Content text, not long reading |
| #427DCE text on black | 5.05:1 | AA | Lc -33.4 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EBF6
oklch(93.7% 0.018 253.3)
-
Step 200
200
#CBDBF1
oklch(88.6% 0.035 256.3)
-
Step 300
300
#A7C3E9
oklch(80.9% 0.062 256.1)
-
Step 400
400
#78A3DF
oklch(70.8% 0.1 256.8)
-
Step 500
500
#548AD6
oklch(63% 0.129 257.1)
-
Step 600
600 (this color)
#427DCE
oklch(58.9% 0.139 256.9)
-
Step 700
700
#2A60A8
oklch(49.1% 0.129 256.7)
-
Step 800
800
#244F88
oklch(42.8% 0.106 256.4)
-
Step 900
900
#22426D
oklch(37.7% 0.083 256.4)
-
Step 950
950
#152740
oklch(27.1% 0.053 256.9)
#427DCE 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) | #5883D1 | 0.029 |
| Deuteranopia (no green cones) | #4376CC | 0.019 |
| Tritanopia (no blue cones) | #00909B | 0.112 |
| Achromatopsia (no color) | #7C7C7C | 0.139 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #427DCE
#427DCE
oklch(58.9% 0.139 256.9)
- #A67100
#A67100
oklch(58.9% 0.124 76.3)
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 #427DCE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.028
- Water Blue #0E87CC ΔE 0.036
- Cool Blue #4984B8 ΔE 0.044
- Steel Blue #4682B4 ΔE 0.046
- Dark Sky Blue #448EE4 ΔE 0.053
- Nice Blue #107AB0 ΔE 0.058
- Off Blue #5684AE ΔE 0.061
- Flat Blue #3C73A8 ΔE 0.062
Use #427DCE 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.