#427BAE
Closest named color: Steel Blue (#4682B4). oklch(56.7% 0.1 247.5), rgb(66, 123, 174).
Aa
Black text reads best on this color (4.67:1).
About this color
#427BAE is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.100 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Steel Blue (#4682B4), ΔE 0.021 away. Black text reads best on it, at 4.67:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.100) |
| Temperature | cool |
| Nearest name | Steel Blue (#4682B4) |
| Black text | 4.67:1 |
| White text | 4.49:1 |
Values
| HEX | #427BAE |
| RGB | rgb(66, 123, 174) |
| HSL | hsl(208, 45%, 47%) |
| OKLCH | oklch(56.7% 0.1 247.5) |
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 #427BAE | 4.49:1 | AA large text | Lc -76.5 | Fine for body text |
| Black text on #427BAE | 4.67:1 | AA | Lc 33.1 | Non-text elements, placeholder text |
| #427BAE text on white | 4.49:1 | AA large text | Lc 71.0 | Content text, not long reading |
| #427BAE text on black | 4.67:1 | AA | Lc -30.7 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E3EBF2
oklch(93.6% 0.013 244.3)
-
Step 200
200
#CDDBE9
oklch(88.5% 0.025 248.1)
-
Step 300
300
#AAC4DD
oklch(80.9% 0.045 247.3)
-
Step 400
400
#7DA5CC
oklch(70.7% 0.072 248.2)
-
Step 500
500
#5A8EBE
oklch(63% 0.092 247.6)
-
Step 600
600 (this color)
#427BAE
oklch(56.7% 0.1 247.5)
-
Step 700
700
#306592
oklch(49.2% 0.092 246.7)
-
Step 800
800
#295277
oklch(42.7% 0.077 247.9)
-
Step 900
900
#264460
oklch(37.7% 0.06 248.1)
-
Step 950
950
#172838
oklch(27% 0.038 247.9)
#427BAE 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) | #657DB0 | 0.040 |
| Deuteranopia (no green cones) | #5672AD | 0.030 |
| Tritanopia (no blue cones) | #00878D | 0.079 |
| Achromatopsia (no color) | #777777 | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #427BAE
#427BAE
oklch(56.7% 0.1 247.5)
- #9D6A2E
#9D6A2E
oklch(56.7% 0.1 67.5)
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 #427BAE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Steel Blue #4682B4 ΔE 0.021
- Flat Blue #3C73A8 ΔE 0.025
- Cerulean #457B9D ΔE 0.027
- Dull Blue #49759C ΔE 0.029
- Cool Blue #4984B8 ΔE 0.029
- Nice Blue #107AB0 ΔE 0.030
- Stormy Blue #507B9C ΔE 0.030
- Windows Blue #3778BF ΔE 0.031
Use #427BAE 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.