#4B5BB1
Closest named color: French Blue (#436BAD). oklch(50.3% 0.137 272.6), rgb(75, 91, 177).
Aa
White text reads best on this color (6.12:1).
About this color
#4B5BB1 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 50%, its chroma 0.137 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.045 away. White text reads best on it, at 6.12:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | moderately saturated (0.137) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 3.43:1 |
| White text | 6.12:1 |
Values
| HEX | #4B5BB1 |
| RGB | rgb(75, 91, 177) |
| HSL | hsl(231, 40%, 49%) |
| OKLCH | oklch(50.3% 0.137 272.6) |
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 #4B5BB1 | 6.12:1 | AA | Lc -85.5 | Fine for body text |
| Black text on #4B5BB1 | 3.43:1 | AA large text | Lc 23.7 | Dividers and decoration only |
| #4B5BB1 text on white | 6.12:1 | AA | Lc 80.3 | Fine for body text |
| #4B5BB1 text on black | 3.43:1 | AA large text | Lc -21.5 | 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 700.
-
Step 50
50
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E5E9F7
oklch(93.5% 0.019 273.2)
-
Step 200
200
#D1D8F2
oklch(88.5% 0.037 273.7)
-
Step 300
300
#B2BFEC
oklch(81% 0.065 272.3)
-
Step 400
400
#8A9CE3
oklch(70.7% 0.106 272.6)
-
Step 500
500
#6E82DB
oklch(63.1% 0.136 272.4)
-
Step 600
600
#586AC8
oklch(55.7% 0.146 272.7)
-
Step 700
700 (this color)
#4B5BB1
oklch(50.3% 0.137 272.6)
-
Step 800
800
#3B488C
oklch(42.7% 0.113 272.6)
-
Step 900
900
#323D70
oklch(37.7% 0.088 272.4)
-
Step 950
950
#1D2442
oklch(27% 0.057 272.2)
#4B5BB1 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) | #3166B4 | 0.036 |
| Deuteranopia (no green cones) | #225EAF | 0.041 |
| Tritanopia (no blue cones) | #066E7D | 0.122 |
| Achromatopsia (no color) | #626262 | 0.137 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4B5BB1
#4B5BB1
oklch(50.3% 0.137 272.6)
- #796200
#796200
oklch(50.4% 0.103 92.8)
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 #4B5BB1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.045
- Iris #6258C4 ΔE 0.045
- Mid Blue #276AB3 ΔE 0.048
- Dusky Blue #475F94 ΔE 0.050
- Denim Blue #3B5B92 ΔE 0.055
- Twilight #4E518B ΔE 0.063
- Slate Blue #6A5ACD ΔE 0.063
- Dark Periwinkle #665FD1 ΔE 0.064
Use #4B5BB1 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.