#511BC1
Closest named color: Violet Blue (#510AC9). oklch(42.8% 0.227 286.6), rgb(81, 27, 193).
Aa
White text reads best on this color (9.22:1).
About this color
#511BC1 is a dark, vivid purple. In OKLCH its lightness is 43%, its chroma 0.227 and its hue 287°. Its hue sits on the cool side of the wheel. The nearest named color is Violet Blue (#510AC9), ΔE 0.016 away. White text reads best on it, at 9.22:1.
| Hue family | Purples |
| Lightness | dark (43%) |
| Chroma | vivid (0.227) |
| Temperature | cool |
| Nearest name | Violet Blue (#510AC9) |
| Black text | 2.27:1 |
| White text | 9.22:1 |
Values
| HEX | #511BC1 |
| RGB | rgb(81, 27, 193) |
| HSL | hsl(260, 75%, 43%) |
| OKLCH | oklch(42.8% 0.227 286.6) |
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 #511BC1 | 9.22:1 | AAA | Lc -94.2 | Preferred for body text |
| Black text on #511BC1 | 2.27:1 | Fails | Lc 14.2 | Not readable |
| #511BC1 text on white | 9.22:1 | AAA | Lc 89.7 | Fine for body text |
| #511BC1 text on black | 2.27:1 | Fails | Lc -12.5 | Not readable |
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 800.
-
Step 50
50
#F4F4FF
oklch(97% 0.015 286.1)
-
Step 100
100
#E8E7FF
oklch(93.6% 0.032 287.7)
-
Step 200
200
#D5D4FF
oklch(88.5% 0.059 286.2)
-
Step 300
300
#BBB7FF
oklch(80.9% 0.101 286.5)
-
Step 400
400
#9B8EFF
oklch(70.7% 0.161 286.8)
-
Step 500
500
#856CFF
oklch(63.1% 0.209 286.6)
-
Step 600
600
#7341FF
oklch(55.6% 0.259 286.6)
-
Step 700
700
#6415EF
oklch(49.1% 0.274 286.6)
-
Step 800
800 (this color)
#511BC1
oklch(42.8% 0.227 286.6)
-
Step 900
900
#422298
oklch(37.8% 0.177 286.9)
-
Step 950
950
#261759
oklch(27.1% 0.112 286.8)
#511BC1 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) | #004BC5 | 0.103 |
| Deuteranopia (no green cones) | #0043BE | 0.095 |
| Tritanopia (no blue cones) | #145173 | 0.183 |
| Achromatopsia (no color) | #474747 | 0.228 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #511BC1
#511BC1
oklch(42.8% 0.227 286.6)
- #565200
#565200
oklch(42.9% 0.092 106.4)
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 #511BC1, closest first.
No curated palette has a color within ΔE 0.04 of #511BC1.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Violet Blue #510AC9 ΔE 0.016
- Purple Blue #5D21D0 ΔE 0.035
- Chrysanthemum #560BAD ΔE 0.040
- Imperial Purple #480CA8 ΔE 0.049
- Majorelle Blue #3F37C9 ΔE 0.049
- Blurple #5539CC ΔE 0.050
- Indigo Blue #3A18B1 ΔE 0.050
- Blue With A Hint Of Purple #533CC6 ΔE 0.051
Use #511BC1 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.