#427CE1
Closest named color: Clear Blue (#247AFD). oklch(59.9% 0.165 260.6), rgb(66, 124, 225).
Aa
Black text reads best on this color (5.20:1).
About this color
#427CE1 is a medium-dark, vivid blue. In OKLCH its lightness is 60%, its chroma 0.165 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Clear Blue (#247AFD), ΔE 0.047 away. Black text reads best on it, at 5.20:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | vivid (0.165) |
| Temperature | cool |
| Nearest name | Clear Blue (#247AFD) |
| Black text | 5.20:1 |
| White text | 4.03:1 |
Values
| HEX | #427CE1 |
| RGB | rgb(66, 124, 225) |
| HSL | hsl(218, 73%, 57%) |
| OKLCH | oklch(59.9% 0.165 260.6) |
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 #427CE1 | 4.03:1 | AA large text | Lc -72.8 | Content text, not long reading |
| Black text on #427CE1 | 5.20:1 | AA | Lc 36.8 | Non-text elements, placeholder text |
| #427CE1 text on white | 4.03:1 | AA large text | Lc 67.3 | Content text, not long reading |
| #427CE1 text on black | 5.20:1 | AA | Lc -34.4 | 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
#E1EAFA
oklch(93.5% 0.024 262.1)
-
Step 200
200
#C8DAF8
oklch(88.4% 0.046 260.7)
-
Step 300
300
#A3C2F5
oklch(80.9% 0.08 260.3)
-
Step 400
400
#71A0F1
oklch(70.7% 0.13 260.8)
-
Step 500
500 (this color)
#427CE1
oklch(59.9% 0.165 260.6)
-
Step 600
600
#2E6DDA
oklch(55.6% 0.179 260.6)
-
Step 700
700
#215ABD
oklch(49% 0.167 260.7)
-
Step 800
800
#1D4A99
oklch(42.6% 0.139 260.8)
-
Step 900
900
#1D3F7A
oklch(37.7% 0.108 260.6)
-
Step 950
950
#122547
oklch(26.9% 0.068 261.1)
#427CE1 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) | #4986E5 | 0.028 |
| Deuteranopia (no green cones) | #2978DF | 0.023 |
| Tritanopia (no blue cones) | #0094A3 | 0.133 |
| Achromatopsia (no color) | #7E7E7E | 0.166 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #427CE1
#427CE1
oklch(59.9% 0.165 260.6)
- #A67600
#A67600
oklch(59.9% 0.124 80.2)
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 #427CE1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Clear Blue #247AFD ΔE 0.047
- Dark Sky Blue #448EE4 ΔE 0.048
- Royal Blue #4169E1 ΔE 0.049
- Soft Blue #6488EA ΔE 0.052
- Water Blue #0E87CC ΔE 0.053
- Windows Blue #3778BF ΔE 0.054
- Cornflower #6A79F7 ΔE 0.056
- Cerulean Blue #056EEE ΔE 0.056
Use #427CE1 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.