#551DBB
Closest named color: Violet Blue (#510AC9). oklch(42.7% 0.219 289.4), rgb(85, 29, 187).
Aa
White text reads best on this color (9.21:1).
About this color
#551DBB is a dark, vivid purple. In OKLCH its lightness is 43%, its chroma 0.219 and its hue 289°. Its hue sits on the cool side of the wheel. The nearest named color is Violet Blue (#510AC9), ΔE 0.027 away. White text reads best on it, at 9.21:1.
| Hue family | Purples |
| Lightness | dark (43%) |
| Chroma | vivid (0.219) |
| Temperature | cool |
| Nearest name | Violet Blue (#510AC9) |
| Black text | 2.27:1 |
| White text | 9.21:1 |
Values
| HEX | #551DBB |
| RGB | rgb(85, 29, 187) |
| HSL | hsl(261, 73%, 42%) |
| OKLCH | oklch(42.7% 0.219 289.4) |
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 #551DBB | 9.21:1 | AAA | Lc -94.3 | Preferred for body text |
| Black text on #551DBB | 2.27:1 | Fails | Lc 14.1 | Not readable |
| #551DBB text on white | 9.21:1 | AAA | Lc 89.8 | Fine for body text |
| #551DBB text on black | 2.27:1 | 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
#BFB6FF
oklch(81% 0.102 289.6)
-
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
#691AE8
oklch(49.1% 0.265 289.3)
-
Step 800
800 (this color)
#551DBB
oklch(42.7% 0.219 289.4)
-
Step 900
900
#452393
oklch(37.7% 0.17 289.5)
-
Step 950
950
#281756
oklch(27% 0.107 289.6)
#551DBB 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) | #004ABF | 0.107 |
| Deuteranopia (no green cones) | #0044B8 | 0.103 |
| Tritanopia (no blue cones) | #2B4F6F | 0.175 |
| Achromatopsia (no color) | #484848 | 0.220 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #551DBB
#551DBB
oklch(42.7% 0.219 289.4)
- #535300
#535300
oklch(42.8% 0.093 109.8)
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 #551DBB, closest first.
No curated palette has a color within ΔE 0.04 of #551DBB.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Violet Blue #510AC9 ΔE 0.027
- Chrysanthemum #560BAD ΔE 0.031
- Purple Blue #5D21D0 ΔE 0.038
- Imperial Purple #480CA8 ΔE 0.046
- Blurple #5539CC ΔE 0.052
- Blue With A Hint Of Purple #533CC6 ΔE 0.052
- Indigo Blue #3A18B1 ΔE 0.055
- Majorelle Blue #3F37C9 ΔE 0.057
Use #551DBB 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.