#51509D
Closest named color: Twilight (#4E518B). oklch(47.1% 0.122 281.3), rgb(81, 80, 157).
Aa
White text reads best on this color (7.03:1).
About this color
#51509D is a medium-dark, moderately saturated purple. In OKLCH its lightness is 47%, its chroma 0.122 and its hue 281°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.030 away. White text reads best on it, at 7.03:1.
| Hue family | Purples |
| Lightness | medium-dark (47%) |
| Chroma | moderately saturated (0.122) |
| Temperature | cool |
| Nearest name | Twilight (#4E518B) |
| Black text | 2.98:1 |
| White text | 7.03:1 |
Values
| HEX | #51509D |
| RGB | rgb(81, 80, 157) |
| HSL | hsl(241, 32%, 46%) |
| OKLCH | oklch(47.1% 0.122 281.3) |
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 #51509D | 7.03:1 | AAA | Lc -89.2 | Fine for body text |
| Black text on #51509D | 2.98:1 | Fails | Lc 19.8 | Dividers and decoration only |
| #51509D text on white | 7.03:1 | AAA | Lc 84.2 | Fine for body text |
| #51509D 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
#E7E9F5
oklch(93.6% 0.016 278.5)
-
Step 200
200
#D5D7EF
oklch(88.5% 0.033 281.9)
-
Step 300
300
#B9BDE7
oklch(80.9% 0.059 280.7)
-
Step 400
400
#969ADA
oklch(70.7% 0.093 281)
-
Step 500
500
#7D7FD0
oklch(63% 0.121 281.3)
-
Step 600
600
#6767BD
oklch(55.5% 0.131 281.2)
-
Step 700
700 (this color)
#51509D
oklch(47.1% 0.122 281.3)
-
Step 800
800
#464684
oklch(42.6% 0.101 281.2)
-
Step 900
900
#3B3C6A
oklch(37.8% 0.078 281.1)
-
Step 950
950
#22233E
oklch(26.9% 0.05 280.9)
#51509D 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) | #2F5CA0 | 0.048 |
| Deuteranopia (no green cones) | #29569B | 0.049 |
| Tritanopia (no blue cones) | #36606F | 0.104 |
| Achromatopsia (no color) | #595959 | 0.122 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51509D
#51509D
oklch(47.1% 0.122 281.3)
- #675C00
#675C00
oklch(47.1% 0.098 101.3)
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 #51509D, closest first.
No curated palette has a color within ΔE 0.04 of #51509D.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.030
- Blueberry #464196 ΔE 0.045
- Denim Blue #3B5B92 ΔE 0.046
- Dusky Blue #475F94 ΔE 0.047
- Dusk #4E5481 ΔE 0.050
- Dark Slate Blue #483D8B ΔE 0.058
- Dusk Blue #26538D ΔE 0.060
- Light Navy Blue #2E5A88 ΔE 0.064
Use #51509D 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.