#421B9F
Closest named color: Imperial Purple (#480CA8). oklch(37.7% 0.191 286.3), rgb(66, 27, 159).
Aa
White text reads best on this color (11.11:1).
About this color
#421B9F is a dark, vivid purple. In OKLCH its lightness is 38%, its chroma 0.191 and its hue 286°. Its hue sits on the cool side of the wheel. The nearest named color is Imperial Purple (#480CA8), ΔE 0.020 away. White text reads best on it, at 11.11:1.
| Hue family | Purples |
| Lightness | dark (38%) |
| Chroma | vivid (0.191) |
| Temperature | cool |
| Nearest name | Imperial Purple (#480CA8) |
| Black text | 1.88:1 |
| White text | 11.11:1 |
Values
| HEX | #421B9F |
| RGB | rgb(66, 27, 159) |
| HSL | hsl(258, 71%, 36%) |
| OKLCH | oklch(37.7% 0.191 286.3) |
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 #421B9F | 11.11:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #421B9F | 1.88:1 | Fails | Lc 9.4 | Not readable |
| #421B9F text on white | 11.11:1 | AAA | Lc 94.5 | Preferred for body text |
| #421B9F text on black | 1.88:1 | Fails | Lc -8.1 | 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 900.
-
Step 50
50
#F4F4FF
oklch(97% 0.015 286.1)
-
Step 100
100
#E8E7FF
oklch(93.6% 0.032 287.7)
-
Step 200
200
#D5D4FF
oklch(88.5% 0.059 286.2)
-
Step 300
300
#BBB7FF
oklch(80.9% 0.101 286.5)
-
Step 400
400
#9A8EFF
oklch(70.6% 0.161 286.3)
-
Step 500
500
#846CFF
oklch(63% 0.209 286.2)
-
Step 600
600
#7241FF
oklch(55.5% 0.259 286.2)
-
Step 700
700
#6400F5
oklch(49.1% 0.285 286.2)
-
Step 800
800
#5203CA
oklch(42.7% 0.245 286.5)
-
Step 900
900 (this color)
#421B9F
oklch(37.7% 0.191 286.3)
-
Step 950
950
#26145D
oklch(27% 0.121 286.5)
#421B9F 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) | #003FA3 | 0.087 |
| Deuteranopia (no green cones) | #00389D | 0.081 |
| Tritanopia (no blue cones) | #11445F | 0.156 |
| Achromatopsia (no color) | #3B3B3B | 0.193 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #421B9F
#421B9F
oklch(37.7% 0.191 286.3)
- #474400
#474400
oklch(37.7% 0.081 106.8)
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 #421B9F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Imperial Purple #480CA8 ΔE 0.020
- Indigo Blue #3A18B1 ΔE 0.034
- Chrysanthemum #560BAD ΔE 0.044
- Indigo #4B0082 ΔE 0.064
- Sapphire #2138AB ΔE 0.068
- Violet Blue #510AC9 ΔE 0.071
- Ultramarine #2000B1 ΔE 0.073
- Dark Slate Blue #483D8B ΔE 0.076
Use #421B9F 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.