#40375E
Closest named color: Prussian Blue (#1D3557). oklch(36.5% 0.067 293.4), rgb(64, 55, 94).
Aa
White text reads best on this color (10.90:1).
About this color
#40375E is a dark, muted purple. In OKLCH its lightness is 36%, its chroma 0.067 and its hue 293°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.056 away. White text reads best on it, at 10.90:1.
| Hue family | Purples |
| Lightness | dark (36%) |
| Chroma | muted (0.067) |
| Temperature | in between |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.92:1 |
| White text | 10.90:1 |
Values
| HEX | #40375E |
| RGB | rgb(64, 55, 94) |
| HSL | hsl(254, 26%, 29%) |
| OKLCH | oklch(36.5% 0.067 293.4) |
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 #40375E | 10.90:1 | AAA | Lc -99.1 | Preferred for body text |
| Black text on #40375E | 1.92:1 | Fails | Lc 8.7 | Not readable |
| #40375E text on white | 10.90:1 | AAA | Lc 95.2 | Preferred for body text |
| #40375E text on black | 1.92:1 | Fails | Lc -7.5 | 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 900.
-
Step 50
50
#F5F5FA
oklch(97.2% 0.007 286.3)
-
Step 100
100
#EAE8F3
oklch(93.6% 0.015 294.5)
-
Step 200
200
#D9D6EA
oklch(88.4% 0.027 292.7)
-
Step 300
300
#C1BBDF
oklch(80.9% 0.051 292.9)
-
Step 400
400
#A297CE
oklch(70.6% 0.08 293.4)
-
Step 500
500
#8C7DC2
oklch(63.1% 0.103 293.2)
-
Step 600
600
#7765AE
oklch(55.6% 0.112 293.8)
-
Step 700
700
#645495
oklch(49.1% 0.103 293.6)
-
Step 800
800
#514579
oklch(42.7% 0.085 293.1)
-
Step 900
900 (this color)
#40375E
oklch(36.5% 0.067 293.4)
-
Step 950
950
#272239
oklch(26.9% 0.042 293.3)
#40375E 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) | #2C3D60 | 0.034 |
| Deuteranopia (no green cones) | #2D3C5D | 0.032 |
| Tritanopia (no blue cones) | #393E46 | 0.054 |
| Achromatopsia (no color) | #3D3D3D | 0.067 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40375E
#40375E
oklch(36.5% 0.067 293.4)
- #3E4214
#3E4214
oklch(36.5% 0.066 113.9)
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 #40375E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.056
- Dark Grey Blue #29465B ΔE 0.056
- Dark Blue Grey #1F3B4D ΔE 0.061
- Onyx #343A40 ΔE 0.061
- Charcoal #264653 ΔE 0.065
- Charcoal Grey #3C4142 ΔE 0.066
- Gunmetal #293241 ΔE 0.066
- Space Cadet #2B2D42 ΔE 0.067
Use #40375E 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.