#427AE3
Closest named color: Clear Blue (#247AFD). oklch(59.6% 0.17 261.6), rgb(66, 122, 227).
Aa
Black text reads best on this color (5.12:1).
About this color
#427AE3 is a medium-dark, vivid blue. In OKLCH its lightness is 60%, its chroma 0.170 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Clear Blue (#247AFD), ΔE 0.043 away. Black text reads best on it, at 5.12:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | vivid (0.170) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 5.12:1 |
| White text | 4.09:1 |
Values
| HEX | #427AE3 |
| RGB | rgb(66, 122, 227) |
| HSL | hsl(219, 74%, 57%) |
| OKLCH | oklch(59.6% 0.17 261.6) |
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 #427AE3 | 4.09:1 | AA large text | Lc -73.3 | Content text, not long reading |
| Black text on #427AE3 | 5.12:1 | AA | Lc 36.3 | Non-text elements, placeholder text |
| #427AE3 text on white | 4.09:1 | AA large text | Lc 67.8 | Content text, not long reading |
| #427AE3 text on black | 5.12:1 | AA | Lc -33.9 | 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 500.
-
Step 50
50
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EAFB
oklch(93.5% 0.025 263.3)
-
Step 200
200
#C9DAF9
oklch(88.5% 0.047 262.5)
-
Step 300
300
#A3C1F7
oklch(80.8% 0.084 262)
-
Step 400
400
#719FF3
oklch(70.6% 0.134 261.7)
-
Step 500
500 (this color)
#427AE3
oklch(59.6% 0.17 261.6)
-
Step 600
600
#306CDE
oklch(55.7% 0.185 261.6)
-
Step 700
700
#2359C0
oklch(49.1% 0.172 261.7)
-
Step 800
800
#1E499C
oklch(42.6% 0.144 261.8)
-
Step 900
900
#1E3E7C
oklch(37.7% 0.112 262)
-
Step 950
950
#122548
oklch(27% 0.07 261.5)
#427AE3 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) | #4385E7 | 0.029 |
| Deuteranopia (no green cones) | #1D76E1 | 0.029 |
| Tritanopia (no blue cones) | #0093A3 | 0.137 |
| Achromatopsia (no color) | #7D7D7D | 0.170 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #427AE3
#427AE3
oklch(59.6% 0.17 261.6)
- #A47600
#A47600
oklch(59.6% 0.123 81.3)
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 #427AE3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Clear Blue #247AFD ΔE 0.043
- Royal Blue #4169E1 ΔE 0.043
- Cerulean Blue #056EEE ΔE 0.051
- Dark Sky Blue #448EE4 ΔE 0.054
- Cornflower #6A79F7 ΔE 0.054
- Soft Blue #6488EA ΔE 0.055
- Windows Blue #3778BF ΔE 0.057
- Water Blue #0E87CC ΔE 0.059
Use #427AE3 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.