#427CB0
Closest named color: Steel Blue (#4682B4). oklch(57% 0.101 247.6), rgb(66, 124, 176).
Aa
Black text reads best on this color (4.74:1).
About this color
#427CB0 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.101 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Steel Blue (#4682B4), ΔE 0.018 away. Black text reads best on it, at 4.74:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.101) |
| Temperature | cool |
| Nearest name | Steel Blue (#4682B4) |
| Black text | 4.74:1 |
| White text | 4.42:1 |
Values
| HEX | #427CB0 |
| RGB | rgb(66, 124, 176) |
| HSL | hsl(208, 45%, 47%) |
| OKLCH | oklch(57% 0.101 247.6) |
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 #427CB0 | 4.42:1 | AA large text | Lc -76.0 | Fine for body text |
| Black text on #427CB0 | 4.74:1 | AA | Lc 33.6 | Non-text elements, placeholder text |
| #427CB0 text on white | 4.42:1 | AA large text | Lc 70.5 | Content text, not long reading |
| #427CB0 text on black | 4.74:1 | AA | Lc -31.1 | 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
#CCDBE9
oklch(88.4% 0.025 246.2)
-
Step 300
300
#AAC4DD
oklch(80.9% 0.045 247.3)
-
Step 400
400
#7CA5CC
oklch(70.7% 0.073 247.6)
-
Step 500
500
#598EBF
oklch(63% 0.093 247.7)
-
Step 600
600 (this color)
#427CB0
oklch(57% 0.101 247.6)
-
Step 700
700
#2F6593
oklch(49.2% 0.094 246.9)
-
Step 800
800
#285277
oklch(42.6% 0.078 247.4)
-
Step 900
900
#254460
oklch(37.6% 0.061 247.4)
-
Step 950
950
#162838
oklch(26.9% 0.038 246.6)
#427CB0 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) | #667EB2 | 0.041 |
| Deuteranopia (no green cones) | #5773AF | 0.031 |
| Tritanopia (no blue cones) | #00888E | 0.080 |
| Achromatopsia (no color) | #787878 | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #427CB0
#427CB0
oklch(57% 0.101 247.6)
- #9F6B2D
#9F6B2D
oklch(57.1% 0.102 67.7)
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 #427CB0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Steel Blue #4682B4 ΔE 0.018
- Cool Blue #4984B8 ΔE 0.026
- Flat Blue #3C73A8 ΔE 0.028
- Cerulean #457B9D ΔE 0.029
- Windows Blue #3778BF ΔE 0.030
- Nice Blue #107AB0 ΔE 0.031
- Stormy Blue #507B9C ΔE 0.033
- Dull Blue #49759C ΔE 0.033
Use #427CB0 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.