#551BBC
Closest named color: Violet Blue (#510AC9). oklch(42.7% 0.221 289.3), rgb(85, 27, 188).
Aa
White text reads best on this color (9.25:1).
About this color
#551BBC is a dark, vivid purple. In OKLCH its lightness is 43%, its chroma 0.221 and its hue 289°. Its hue sits on the cool side of the wheel. The nearest named color is Violet Blue (#510AC9), ΔE 0.025 away. White text reads best on it, at 9.25:1.
| Hue family | Purples |
| Lightness | dark (43%) |
| Chroma | vivid (0.221) |
| Temperature | cool |
| Nearest name | Violet Blue (#510AC9) |
| Black text | 2.26:1 |
| White text | 9.25:1 |
Values
| HEX | #551BBC |
| RGB | rgb(85, 27, 188) |
| HSL | hsl(262, 75%, 42%) |
| OKLCH | oklch(42.7% 0.221 289.3) |
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 #551BBC | 9.25:1 | AAA | Lc -94.4 | Preferred for body text |
| Black text on #551BBC | 2.26:1 | Fails | Lc 14.1 | Not readable |
| #551BBC text on white | 9.25:1 | AAA | Lc 89.9 | Fine for body text |
| #551BBC text on black | 2.26:1 | Fails | Lc -12.4 | 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
#F5F4FF
oklch(97.1% 0.015 290.3)
-
Step 100
100
#E9E7FF
oklch(93.7% 0.032 289.6)
-
Step 200
200
#D7D3FF
oklch(88.4% 0.06 289.3)
-
Step 300
300
#BEB6FF
oklch(80.9% 0.102 288.9)
-
Step 400
400
#A08CFF
oklch(70.8% 0.164 289.5)
-
Step 500
500
#8B69FF
oklch(63.1% 0.213 289.3)
-
Step 600
600
#7A3BFF
oklch(55.6% 0.264 289.4)
-
Step 700
700
#6916E9
oklch(49% 0.267 289.3)
-
Step 800
800 (this color)
#551BBC
oklch(42.7% 0.221 289.3)
-
Step 900
900
#452294
oklch(37.7% 0.172 289.4)
-
Step 950
950
#281757
oklch(27.1% 0.109 289.3)
#551BBC 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) | #004AC0 | 0.108 |
| Deuteranopia (no green cones) | #0043B9 | 0.103 |
| Tritanopia (no blue cones) | #2A4F70 | 0.176 |
| Achromatopsia (no color) | #474747 | 0.223 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #551BBC
#551BBC
oklch(42.7% 0.221 289.3)
- #535200
#535200
oklch(42.6% 0.092 108.9)
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 #551BBC, closest first.
No curated palette has a color within ΔE 0.04 of #551BBC.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Violet Blue #510AC9 ΔE 0.025
- Chrysanthemum #560BAD ΔE 0.031
- Purple Blue #5D21D0 ΔE 0.037
- Imperial Purple #480CA8 ΔE 0.046
- Blurple #5539CC ΔE 0.053
- Blue With A Hint Of Purple #533CC6 ΔE 0.054
- Indigo Blue #3A18B1 ΔE 0.054
- Majorelle Blue #3F37C9 ΔE 0.057
Use #551BBC 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.