#51519B
Closest named color: Twilight (#4E518B). oklch(47.2% 0.117 280.9), rgb(81, 81, 155).
Aa
White text reads best on this color (6.99:1).
About this color
#51519B is a medium-dark, moderately saturated purple. In OKLCH its lightness is 47%, its chroma 0.117 and its hue 281°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.027 away. White text reads best on it, at 6.99:1.
| Hue family | Purples |
| Lightness | medium-dark (47%) |
| Chroma | moderately saturated (0.117) |
| Temperature | cool |
| Nearest name | Twilight (#4E518B) |
| Black text | 3.00:1 |
| White text | 6.99:1 |
Values
| HEX | #51519B |
| RGB | rgb(81, 81, 155) |
| HSL | hsl(240, 31%, 46%) |
| OKLCH | oklch(47.2% 0.117 280.9) |
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 #51519B | 6.99:1 | AA | Lc -89.0 | Fine for body text |
| Black text on #51519B | 3.00:1 | AA large text | Lc 19.9 | Dividers and decoration only |
| #51519B text on white | 6.99:1 | AA | Lc 84.1 | Fine for body text |
| #51519B text on black | 3.00:1 | AA large text | Lc -17.9 | 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
#D5D7EE
oklch(88.5% 0.032 281.8)
-
Step 300
300
#B9BDE5
oklch(80.9% 0.056 280.6)
-
Step 400
400
#969AD8
oklch(70.6% 0.09 281)
-
Step 500
500
#7D80CE
oklch(63.1% 0.116 280.8)
-
Step 600
600
#6768BB
oklch(55.5% 0.127 280.9)
-
Step 700
700 (this color)
#51519B
oklch(47.2% 0.117 280.9)
-
Step 800
800
#464782
oklch(42.6% 0.096 280.8)
-
Step 900
900
#3B3C69
oklch(37.8% 0.076 281.1)
-
Step 950
950
#22233D
oklch(26.9% 0.048 281)
#51519B 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) | #325C9E | 0.045 |
| Deuteranopia (no green cones) | #2D5699 | 0.045 |
| Tritanopia (no blue cones) | #37616E | 0.103 |
| Achromatopsia (no color) | #595959 | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51519B
#51519B
oklch(47.2% 0.117 280.9)
- #685C00
#685C00
oklch(47.2% 0.098 100.5)
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 #51519B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.027
- Denim Blue #3B5B92 ΔE 0.043
- Dusky Blue #475F94 ΔE 0.044
- Dusk #4E5481 ΔE 0.046
- Blueberry #464196 ΔE 0.047
- Dusk Blue #26538D ΔE 0.058
- Dark Slate Blue #483D8B ΔE 0.059
- Light Navy Blue #2E5A88 ΔE 0.061
Use #51519B 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.