#402F90
Closest named color: Dark Slate Blue (#483D8B). oklch(38.7% 0.152 284.8), rgb(64, 47, 144).
Aa
White text reads best on this color (10.35:1).
About this color
#402F90 is a dark, vivid purple. In OKLCH its lightness is 39%, its chroma 0.152 and its hue 285°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.039 away. White text reads best on it, at 10.35:1.
| Hue family | Purples |
| Lightness | dark (39%) |
| Chroma | vivid (0.152) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.02:1 |
| White text | 10.35:1 |
Values
| HEX | #402F90 |
| RGB | rgb(64, 47, 144) |
| HSL | hsl(251, 51%, 37%) |
| OKLCH | oklch(38.7% 0.152 284.8) |
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 #402F90 | 10.35:1 | AAA | Lc -97.6 | Preferred for body text |
| Black text on #402F90 | 2.02:1 | Fails | Lc 10.4 | Not readable |
| #402F90 text on white | 10.35:1 | AAA | Lc 93.5 | Preferred for body text |
| #402F90 text on black | 2.02:1 | Fails | Lc -9.0 | 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
#E7E7FF
oklch(93.5% 0.032 285.8)
-
Step 200
200
#D4D5FF
oklch(88.6% 0.058 284.1)
-
Step 300
300
#B9B8FF
oklch(80.9% 0.1 284.6)
-
Step 400
400
#978FFF
oklch(70.6% 0.16 284.8)
-
Step 500
500
#816EFF
oklch(63.1% 0.207 284.7)
-
Step 600
600
#6E46FD
oklch(55.6% 0.253 284.7)
-
Step 700
700
#5D34DD
oklch(49.1% 0.236 284.8)
-
Step 800
800
#4B2EB2
oklch(42.6% 0.195 284.6)
-
Step 900
900 (this color)
#402F90
oklch(38.7% 0.152 284.8)
-
Step 950
950
#241B52
oklch(26.9% 0.096 285.5)
#402F90 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) | #004393 | 0.071 |
| Deuteranopia (no green cones) | #003D8E | 0.068 |
| Tritanopia (no blue cones) | #1D475B | 0.127 |
| Achromatopsia (no color) | #404040 | 0.153 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #402F90
#402F90
oklch(38.7% 0.152 284.8)
- #4B4600
#4B4600
oklch(38.7% 0.082 105)
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 #402F90, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.039
- Blueberry #464196 ΔE 0.046
- Imperial Purple #480CA8 ΔE 0.059
- Sapphire #2138AB ΔE 0.063
- Indigo Blue #3A18B1 ΔE 0.064
- Cobalt #1E488F ΔE 0.070
- Chrysanthemum #560BAD ΔE 0.071
- Indigo #4B0082 ΔE 0.073
Use #402F90 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.