#4B71C9
Closest named color: Windows Blue (#3778BF). oklch(56.4% 0.143 264.7), rgb(75, 113, 201).
Aa
White text reads best on this color (4.66:1).
About this color
#4B71C9 is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.143 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.031 away. White text reads best on it, at 4.66:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.143) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.50:1 |
| White text | 4.66:1 |
Values
| HEX | #4B71C9 |
| RGB | rgb(75, 113, 201) |
| HSL | hsl(222, 54%, 54%) |
| OKLCH | oklch(56.4% 0.143 264.7) |
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 #4B71C9 | 4.66:1 | AA | Lc -77.6 | Fine for body text |
| Black text on #4B71C9 | 4.50:1 | AA | Lc 31.9 | Non-text elements, placeholder text |
| #4B71C9 text on white | 4.66:1 | AA | Lc 72.1 | Content text, not long reading |
| #4B71C9 text on black | 4.50:1 | AA | Lc -29.5 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E4EAF7
oklch(93.6% 0.019 266)
-
Step 200
200
#CED9F2
oklch(88.5% 0.036 266.7)
-
Step 300
300
#ACC1EB
oklch(80.9% 0.064 264.1)
-
Step 400
400
#819FE1
oklch(70.6% 0.103 265.1)
-
Step 500
500
#6186D9
oklch(63% 0.132 264.7)
-
Step 600
600 (this color)
#4B71C9
oklch(56.4% 0.143 264.7)
-
Step 700
700
#3A5CAB
oklch(49.1% 0.132 264.5)
-
Step 800
800
#304B8B
oklch(42.6% 0.111 264.9)
-
Step 900
900
#2A3F6F
oklch(37.6% 0.087 264.8)
-
Step 950
950
#192541
oklch(26.9% 0.055 265.3)
#4B71C9 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) | #487ACC | 0.024 |
| Deuteranopia (no green cones) | #346FC7 | 0.024 |
| Tritanopia (no blue cones) | #008593 | 0.121 |
| Achromatopsia (no color) | #747474 | 0.143 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4B71C9
#4B71C9
oklch(56.4% 0.143 264.7)
- #956F00
#956F00
oklch(56.4% 0.116 84.7)
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 #4B71C9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.031
- Royal Blue #4169E1 ΔE 0.046
- French Blue #436BAD ΔE 0.046
- Mid Blue #276AB3 ΔE 0.053
- Dark Periwinkle #665FD1 ΔE 0.056
- Flat Blue #3C73A8 ΔE 0.056
- Steel Blue #4682B4 ΔE 0.063
- Nice Blue #107AB0 ΔE 0.064
Use #4B71C9 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.