#427AA4
Closest named color: Cerulean (#457B9D). oklch(55.9% 0.088 242.9), rgb(66, 122, 164).
Aa
White text reads best on this color (4.61:1).
About this color
#427AA4 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.088 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean (#457B9D), ΔE 0.012 away. White text reads best on it, at 4.61:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.088) |
| Temperature | cool |
| Nearest name | Cerulean (#457B9D) |
| Black text | 4.55:1 |
| White text | 4.61:1 |
Values
| HEX | #427AA4 |
| RGB | rgb(66, 122, 164) |
| HSL | hsl(206, 43%, 45%) |
| OKLCH | oklch(55.9% 0.088 242.9) |
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 #427AA4 | 4.61:1 | AA | Lc -77.3 | Fine for body text |
| Black text on #427AA4 | 4.55:1 | AA | Lc 32.2 | Non-text elements, placeholder text |
| #427AA4 text on white | 4.61:1 | AA | Lc 71.9 | Content text, not long reading |
| #427AA4 text on black | 4.55:1 | AA | Lc -29.8 | Dividers and decoration only |
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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E4EBF1
oklch(93.6% 0.011 243.7)
-
Step 200
200
#CDDBE7
oklch(88.4% 0.022 243.8)
-
Step 300
300
#ABC4D9
oklch(80.8% 0.04 243.6)
-
Step 400
400
#7EA6C6
oklch(70.8% 0.064 242.9)
-
Step 500
500
#5C8FB7
oklch(63% 0.082 243.2)
-
Step 600
600 (this color)
#427AA4
oklch(55.9% 0.088 242.9)
-
Step 700
700
#32668C
oklch(49.2% 0.083 242.7)
-
Step 800
800
#2B5371
oklch(42.7% 0.067 242.9)
-
Step 900
900
#27455C
oklch(37.8% 0.053 243)
-
Step 950
950
#172836
oklch(26.9% 0.035 244.4)
#427AA4 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) | #687AA6 | 0.044 |
| Deuteranopia (no green cones) | #5A71A3 | 0.034 |
| Tritanopia (no blue cones) | #008488 | 0.069 |
| Achromatopsia (no color) | #757575 | 0.088 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #427AA4
#427AA4
oklch(55.9% 0.088 242.9)
- #99683A
#99683A
oklch(55.9% 0.088 62.5)
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 #427AA4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean #457B9D ΔE 0.012
- Dull Blue #49759C ΔE 0.017
- Stormy Blue #507B9C ΔE 0.019
- Flat Blue #3C73A8 ΔE 0.024
- Muted Blue #3B719F ΔE 0.028
- Steel Blue #4682B4 ΔE 0.031
- Nice Blue #107AB0 ΔE 0.033
- Metallic Blue #4F738E ΔE 0.036
Use #427AA4 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.