#4B51A0
Closest named color: Twilight (#4E518B). oklch(47.1% 0.126 277.1), rgb(75, 81, 160).
Aa
White text reads best on this color (7.03:1).
About this color
#4B51A0 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 47%, its chroma 0.126 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.034 away. White text reads best on it, at 7.03:1.
| Hue family | Blues |
| Lightness | medium-dark (47%) |
| Chroma | moderately saturated (0.126) |
| Temperature | cool |
| Nearest name | Twilight (#4E518B) |
| Black text | 2.98:1 |
| White text | 7.03:1 |
Values
| HEX | #4B51A0 |
| RGB | rgb(75, 81, 160) |
| HSL | hsl(236, 36%, 46%) |
| OKLCH | oklch(47.1% 0.126 277.1) |
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 #4B51A0 | 7.03:1 | AAA | Lc -89.1 | Fine for body text |
| Black text on #4B51A0 | 2.98:1 | Fails | Lc 19.8 | Dividers and decoration only |
| #4B51A0 text on white | 7.03:1 | AAA | Lc 84.2 | Fine for body text |
| #4B51A0 text on black | 2.98:1 | Fails | Lc -17.8 | 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
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E7E9F6
oklch(93.6% 0.018 279.1)
-
Step 200
200
#D3D8F0
oklch(88.6% 0.033 276.3)
-
Step 300
300
#B6BEE8
oklch(80.9% 0.06 276.5)
-
Step 400
400
#919BDD
oklch(70.7% 0.097 277)
-
Step 500
500
#7781D4
oklch(63.1% 0.125 277)
-
Step 600
600
#6169C1
oklch(55.7% 0.135 277.1)
-
Step 700
700 (this color)
#4B51A0
oklch(47.1% 0.126 277.1)
-
Step 800
800
#424787
oklch(42.7% 0.105 277.6)
-
Step 900
900
#373C6C
oklch(37.6% 0.082 277.2)
-
Step 950
950
#20243F
oklch(27.1% 0.05 276.1)
#4B51A0 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) | #2C5CA3 | 0.042 |
| Deuteranopia (no green cones) | #23559E | 0.045 |
| Tritanopia (no blue cones) | #266271 | 0.109 |
| Achromatopsia (no color) | #595959 | 0.126 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4B51A0
#4B51A0
oklch(47.1% 0.126 277.1)
- #6A5A00
#6A5A00
oklch(46.9% 0.097 97.1)
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 #4B51A0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.034
- Denim Blue #3B5B92 ΔE 0.043
- Blueberry #464196 ΔE 0.045
- Dusky Blue #475F94 ΔE 0.047
- Dusk #4E5481 ΔE 0.053
- Dusk Blue #26538D ΔE 0.055
- Dark Slate Blue #483D8B ΔE 0.060
- Light Navy Blue #2E5A88 ΔE 0.061
Use #4B51A0 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.