#4271BF
Closest named color: Windows Blue (#3778BF). oklch(55.4% 0.132 260), rgb(66, 113, 191).
Aa
White text reads best on this color (4.83:1).
About this color
#4271BF is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.132 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.020 away. White text reads best on it, at 4.83:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.132) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.34:1 |
| White text | 4.83:1 |
Values
| HEX | #4271BF |
| RGB | rgb(66, 113, 191) |
| HSL | hsl(217, 49%, 50%) |
| OKLCH | oklch(55.4% 0.132 260) |
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 #4271BF | 4.83:1 | AA | Lc -78.7 | Fine for body text |
| Black text on #4271BF | 4.34:1 | AA large text | Lc 30.8 | Non-text elements, placeholder text |
| #4271BF text on white | 4.83:1 | AA | Lc 73.3 | Content text, not long reading |
| #4271BF text on black | 4.34:1 | AA large text | Lc -28.4 | 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
#E3EAF6
oklch(93.5% 0.018 261.3)
-
Step 200
200
#CDDAF0
oklch(88.5% 0.033 261)
-
Step 300
300
#ABC2E8
oklch(81% 0.06 260.4)
-
Step 400
400
#7EA1DC
oklch(70.6% 0.095 260.6)
-
Step 500
500
#5D89D3
oklch(63.1% 0.122 260.3)
-
Step 600
600 (this color)
#4271BF
oklch(55.4% 0.132 260)
-
Step 700
700
#345FA5
oklch(49.1% 0.122 259.7)
-
Step 800
800
#2C4E86
oklch(42.8% 0.101 259.9)
-
Step 900
900
#28416B
oklch(37.7% 0.079 260.2)
-
Step 950
950
#17263F
oklch(26.9% 0.051 260.2)
#4271BF 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) | #4E78C2 | 0.025 |
| Deuteranopia (no green cones) | #3B6CBD | 0.016 |
| Tritanopia (no blue cones) | #00838F | 0.108 |
| Achromatopsia (no color) | #727272 | 0.132 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4271BF
#4271BF
oklch(55.4% 0.132 260)
- #956A00
#956A00
oklch(55.4% 0.115 80.5)
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 #4271BF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.020
- French Blue #436BAD ΔE 0.030
- Mid Blue #276AB3 ΔE 0.037
- Flat Blue #3C73A8 ΔE 0.039
- Nice Blue #107AB0 ΔE 0.047
- Muted Blue #3B719F ΔE 0.052
- Steel Blue #4682B4 ΔE 0.055
- Cool Blue #4984B8 ΔE 0.059
Use #4271BF 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.