#403B9B
Closest named color: Blueberry (#464196). oklch(41.7% 0.151 279.9), rgb(64, 59, 155).
Aa
White text reads best on this color (9.06:1).
About this color
#403B9B is a dark, vivid blue. In OKLCH its lightness is 42%, its chroma 0.151 and its hue 280°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.021 away. White text reads best on it, at 9.06:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | vivid (0.151) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.31:1 |
| White text | 9.06:1 |
Values
| HEX | #403B9B |
| RGB | rgb(64, 59, 155) |
| HSL | hsl(243, 45%, 42%) |
| OKLCH | oklch(41.7% 0.151 279.9) |
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 #403B9B | 9.06:1 | AAA | Lc -94.9 | Preferred for body text |
| Black text on #403B9B | 2.31:1 | Fails | Lc 13.5 | Not readable |
| #403B9B text on white | 9.06:1 | AAA | Lc 90.4 | Preferred for body text |
| #403B9B text on black | 2.31:1 | Fails | Lc -11.9 | 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
#F4F5FE
oklch(97.2% 0.012 281.1)
-
Step 100
100
#E6E8FB
oklch(93.5% 0.026 281.1)
-
Step 200
200
#D2D6FA
oklch(88.4% 0.05 280.3)
-
Step 300
300
#B5BBF9
oklch(80.9% 0.088 279.9)
-
Step 400
400
#9095F7
oklch(70.7% 0.142 279.9)
-
Step 500
500
#7777F3
oklch(63.1% 0.181 279.9)
-
Step 600
600
#625CE2
oklch(55.6% 0.197 279.8)
-
Step 700
700
#524BC4
oklch(49.2% 0.182 279.9)
-
Step 800
800 (this color)
#403B9B
oklch(41.7% 0.151 279.9)
-
Step 900
900
#37367E
oklch(37.6% 0.119 279.7)
-
Step 950
950
#20204A
oklch(26.9% 0.076 280)
#403B9B 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) | #004C9E | 0.062 |
| Deuteranopia (no green cones) | #004599 | 0.058 |
| Tritanopia (no blue cones) | #085265 | 0.130 |
| Achromatopsia (no color) | #494949 | 0.152 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403B9B
#403B9B
oklch(41.7% 0.151 279.9)
- #574D00
#574D00
oklch(41.7% 0.087 100.8)
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 #403B9B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.021
- Dark Slate Blue #483D8B ΔE 0.030
- Sapphire #2138AB ΔE 0.049
- Cobalt #1E488F ΔE 0.053
- Rebecca Purple #663399 ΔE 0.068
- Indigo Blue #3A18B1 ΔE 0.070
- Twilight #4E518B ΔE 0.072
- Imperial Purple #480CA8 ΔE 0.073
Use #403B9B 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.