#421DCB
Closest named color: Violet Blue (#510AC9). oklch(42.7% 0.238 279), rgb(66, 29, 203).
Aa
White text reads best on this color (9.25:1).
About this color
#421DCB is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.238 and its hue 279°. Its hue sits on the cool side of the wheel. The nearest named color is Violet Blue (#510AC9), ΔE 0.030 away. White text reads best on it, at 9.25:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.238) |
| Temperature | cool |
| Nearest name | Violet Blue (#510AC9) |
| Black text | 2.26:1 |
| White text | 9.25:1 |
Values
| HEX | #421DCB |
| RGB | rgb(66, 29, 203) |
| HSL | hsl(253, 75%, 45%) |
| OKLCH | oklch(42.7% 0.238 279) |
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 #421DCB | 9.25:1 | AAA | Lc -94.2 | Preferred for body text |
| Black text on #421DCB | 2.26:1 | Fails | Lc 14.3 | Not readable |
| #421DCB text on white | 9.25:1 | AAA | Lc 89.7 | Fine for body text |
| #421DCB text on black | 2.26:1 | 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
#F3F5FF
oklch(97.2% 0.013 277.1)
-
Step 100
100
#E5E8FF
oklch(93.6% 0.031 279.9)
-
Step 200
200
#D0D6FF
oklch(88.5% 0.057 278.6)
-
Step 300
300
#B3BAFF
oklch(80.8% 0.098 279.5)
-
Step 400
400
#8D94FF
oklch(70.8% 0.155 278.8)
-
Step 500
500
#7474FF
oklch(63.2% 0.201 278.9)
-
Step 600
600
#5F4DFF
oklch(55.5% 0.25 279)
-
Step 700
700
#5218FC
oklch(49.1% 0.287 278.9)
-
Step 800
800 (this color)
#421DCB
oklch(42.7% 0.238 279)
-
Step 900
900
#35249F
oklch(37.6% 0.185 278.9)
-
Step 950
950
#1E185D
oklch(26.9% 0.117 278.9)
#421DCB 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) | #004DD0 | 0.087 |
| Deuteranopia (no green cones) | #0040C8 | 0.070 |
| Tritanopia (no blue cones) | #005779 | 0.186 |
| Achromatopsia (no color) | #474747 | 0.240 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #421DCB
#421DCB
oklch(42.7% 0.238 279)
- #5B4F00
#5B4F00
oklch(42.7% 0.088 99.2)
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 #421DCB, closest first.
No curated palette has a color within ΔE 0.04 of #421DCB.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Violet Blue #510AC9 ΔE 0.030
- Majorelle Blue #3F37C9 ΔE 0.036
- Indigo Blue #3A18B1 ΔE 0.046
- Purple Blue #5D21D0 ΔE 0.051
- Blurple #5539CC ΔE 0.056
- Blue With A Hint Of Purple #533CC6 ΔE 0.058
- Blue Blue #2242C7 ΔE 0.062
- Imperial Purple #480CA8 ΔE 0.065
Use #421DCB 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.