#4271AF
Closest named color: Flat Blue (#3C73A8). oklch(54.4% 0.11 255.9), rgb(66, 113, 175).
Aa
White text reads best on this color (4.98:1).
About this color
#4271AF is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.110 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Flat Blue (#3C73A8), ΔE 0.015 away. White text reads best on it, at 4.98:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.110) |
| Temperature | cool |
| Nearest name | Flat Blue (#3C73A8) |
| Black text | 4.21:1 |
| White text | 4.98:1 |
Values
| HEX | #4271AF |
| RGB | rgb(66, 113, 175) |
| HSL | hsl(214, 45%, 47%) |
| OKLCH | oklch(54.4% 0.11 255.9) |
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 #4271AF | 4.98:1 | AA | Lc -79.7 | Fine for body text |
| Black text on #4271AF | 4.21:1 | AA large text | Lc 29.8 | Dividers and decoration only |
| #4271AF text on white | 4.98:1 | AA | Lc 74.3 | Content text, not long reading |
| #4271AF text on black | 4.21:1 | AA large text | Lc -27.4 | 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
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E4EAF4
oklch(93.5% 0.015 260.7)
-
Step 200
200
#CEDAEC
oklch(88.5% 0.028 258.4)
-
Step 300
300
#ACC3E1
oklch(81% 0.049 255.1)
-
Step 400
400
#80A3D2
oklch(70.7% 0.079 255.9)
-
Step 500
500
#5F8BC6
oklch(63% 0.102 256)
-
Step 600
600 (this color)
#4271AF
oklch(54.4% 0.11 255.9)
-
Step 700
700
#37629A
oklch(49.2% 0.102 255.7)
-
Step 800
800
#2E507D
oklch(42.8% 0.085 256)
-
Step 900
900
#294264
oklch(37.6% 0.066 256.4)
-
Step 950
950
#18273B
oklch(27% 0.043 255.9)
#4271AF 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) | #5775B2 | 0.028 |
| Deuteranopia (no green cones) | #486BAE | 0.017 |
| Tritanopia (no blue cones) | #007F88 | 0.091 |
| Achromatopsia (no color) | #707070 | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4271AF
#4271AF
oklch(54.4% 0.11 255.9)
- #94650D
#94650D
oklch(54.3% 0.11 75.6)
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 #4271AF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Flat Blue #3C73A8 ΔE 0.015
- French Blue #436BAD ΔE 0.017
- Muted Blue #3B719F ΔE 0.027
- Windows Blue #3778BF ΔE 0.028
- Mid Blue #276AB3 ΔE 0.034
- Dull Blue #49759C ΔE 0.036
- Nice Blue #107AB0 ΔE 0.036
- Cerulean #457B9D ΔE 0.046
Use #4271AF 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.