#427AD8
Closest named color: Windows Blue (#3778BF). oklch(58.9% 0.156 260.1), rgb(66, 122, 216).
Aa
Black text reads best on this color (5.00:1).
About this color
#427AD8 is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.156 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.040 away. Black text reads best on it, at 5.00:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.156) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 5.00:1 |
| White text | 4.19:1 |
Values
| HEX | #427AD8 |
| RGB | rgb(66, 122, 216) |
| HSL | hsl(218, 66%, 55%) |
| OKLCH | oklch(58.9% 0.156 260.1) |
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 #427AD8 | 4.19:1 | AA large text | Lc -74.1 | Content text, not long reading |
| Black text on #427AD8 | 5.00:1 | AA | Lc 35.5 | Non-text elements, placeholder text |
| #427AD8 text on white | 4.19:1 | AA large text | Lc 68.6 | Content text, not long reading |
| #427AD8 text on black | 5.00:1 | AA | Lc -33.1 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E2EAF8
oklch(93.5% 0.021 261.8)
-
Step 200
200
#CBDAF4
oklch(88.5% 0.039 261.5)
-
Step 300
300
#A7C2EF
oklch(81% 0.07 260.6)
-
Step 400
400
#77A1E6
oklch(70.7% 0.112 260)
-
Step 500
500
#5488DF
oklch(63.1% 0.143 260.1)
-
Step 600
600 (this color)
#427AD8
oklch(58.9% 0.156 260.1)
-
Step 700
700
#2B5DB1
oklch(49.1% 0.144 260.2)
-
Step 800
800
#244C90
oklch(42.6% 0.121 260.3)
-
Step 900
900
#224073
oklch(37.7% 0.095 260.3)
-
Step 950
950
#152643
oklch(27% 0.059 260.5)
#427AD8 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) | #4C83DC | 0.027 |
| Deuteranopia (no green cones) | #3175D6 | 0.021 |
| Tritanopia (no blue cones) | #00909E | 0.125 |
| Achromatopsia (no color) | #7C7C7C | 0.156 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #427AD8
#427AD8
oklch(58.9% 0.156 260.1)
- #A27300
#A27300
oklch(58.8% 0.122 80.1)
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 #427AD8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.040
- Royal Blue #4169E1 ΔE 0.048
- Water Blue #0E87CC ΔE 0.048
- Dark Sky Blue #448EE4 ΔE 0.054
- Clear Blue #247AFD ΔE 0.058
- Cerulean Blue #056EEE ΔE 0.060
- Soft Blue #6488EA ΔE 0.060
- Cool Blue #4984B8 ΔE 0.062
Use #427AD8 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.