#4271C8
Closest named color: Windows Blue (#3778BF). oklch(55.9% 0.145 261.6), rgb(66, 113, 200).
Aa
White text reads best on this color (4.74:1).
About this color
#4271C8 is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.145 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.027 away. White text reads best on it, at 4.74:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.145) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.42:1 |
| White text | 4.74:1 |
Values
| HEX | #4271C8 |
| RGB | rgb(66, 113, 200) |
| HSL | hsl(219, 55%, 52%) |
| OKLCH | oklch(55.9% 0.145 261.6) |
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 #4271C8 | 4.74:1 | AA | Lc -78.1 | Fine for body text |
| Black text on #4271C8 | 4.42:1 | AA large text | Lc 31.4 | Non-text elements, placeholder text |
| #4271C8 text on white | 4.74:1 | AA | Lc 72.6 | Content text, not long reading |
| #4271C8 text on black | 4.42:1 | AA large text | Lc -29.0 | Dividers and decoration only |
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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E3EAF7
oklch(93.6% 0.019 263)
-
Step 200
200
#CCDAF2
oklch(88.5% 0.036 261.3)
-
Step 300
300
#AAC2EB
oklch(81% 0.064 261.1)
-
Step 400
400
#7CA1E2
oklch(70.8% 0.104 261.3)
-
Step 500
500
#5B88D9
oklch(63.1% 0.132 261.4)
-
Step 600
600 (this color)
#4271C8
oklch(55.9% 0.145 261.6)
-
Step 700
700
#335DAC
oklch(49.1% 0.135 261.7)
-
Step 800
800
#2B4D8B
oklch(42.8% 0.11 261.3)
-
Step 900
900
#27406F
oklch(37.6% 0.087 261.9)
-
Step 950
950
#172641
oklch(27% 0.055 261.4)
#4271C8 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) | #477ACB | 0.026 |
| Deuteranopia (no green cones) | #316DC6 | 0.020 |
| Tritanopia (no blue cones) | #008593 | 0.117 |
| Achromatopsia (no color) | #737373 | 0.145 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4271C8
#4271C8
oklch(55.9% 0.145 261.6)
- #966C00
#966C00
oklch(55.9% 0.115 81.6)
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 #4271C8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.027
- French Blue #436BAD ΔE 0.043
- Mid Blue #276AB3 ΔE 0.045
- Royal Blue #4169E1 ΔE 0.046
- Flat Blue #3C73A8 ΔE 0.053
- Nice Blue #107AB0 ΔE 0.057
- Water Blue #0E87CC ΔE 0.061
- Dark Periwinkle #665FD1 ΔE 0.062
Use #4271C8 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.