#51399E
Closest named color: Blueberry (#464196). oklch(43% 0.156 289.1), rgb(81, 57, 158).
Aa
White text reads best on this color (8.64:1).
About this color
#51399E is a dark, vivid purple. In OKLCH its lightness is 43%, its chroma 0.156 and its hue 289°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.028 away. White text reads best on it, at 8.64:1.
| Hue family | Purples |
| Lightness | dark (43%) |
| Chroma | vivid (0.156) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.42:1 |
| White text | 8.64:1 |
Values
| HEX | #51399E |
| RGB | rgb(81, 57, 158) |
| HSL | hsl(254, 47%, 42%) |
| OKLCH | oklch(43% 0.156 289.1) |
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 #51399E | 8.64:1 | AAA | Lc -93.8 | Preferred for body text |
| Black text on #51399E | 2.42:1 | Fails | Lc 14.7 | Not readable |
| #51399E text on white | 8.64:1 | AAA | Lc 89.2 | Fine for body text |
| #51399E text on black | 2.42:1 | Fails | Lc -13.0 | 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
#F5F4FD
oklch(97% 0.012 291.3)
-
Step 100
100
#E9E7FB
oklch(93.5% 0.027 290.5)
-
Step 200
200
#D7D4F9
oklch(88.4% 0.051 289)
-
Step 300
300
#BEB7F8
oklch(80.8% 0.091 289.1)
-
Step 400
400
#9F8FF5
oklch(70.7% 0.146 289.3)
-
Step 500
500
#8970F1
oklch(63.2% 0.186 288.8)
-
Step 600
600
#7553DF
oklch(55.5% 0.203 289.3)
-
Step 700
700
#6343C2
oklch(49.2% 0.188 289.2)
-
Step 800
800 (this color)
#51399E
oklch(43% 0.156 289.1)
-
Step 900
900
#42327D
oklch(37.8% 0.122 289)
-
Step 950
950
#261E49
oklch(27% 0.077 288.7)
#51399E 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) | #004EA1 | 0.087 |
| Deuteranopia (no green cones) | #00499C | 0.085 |
| Tritanopia (no blue cones) | #385166 | 0.127 |
| Achromatopsia (no color) | #4C4C4C | 0.157 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51399E
#51399E
oklch(43% 0.156 289.1)
- #545300
#545300
oklch(42.9% 0.093 109)
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 #51399E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.028
- Dark Slate Blue #483D8B ΔE 0.036
- Rebecca Purple #663399 ΔE 0.041
- Blue With A Hint Of Purple #533CC6 ΔE 0.065
- Chrysanthemum #560BAD ΔE 0.067
- Twilight #4E518B ΔE 0.072
- Imperial Purple #480CA8 ΔE 0.072
- Sapphire #2138AB ΔE 0.073
Use #51399E 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.