#40374A
Closest named color: Onyx (#343A40). oklch(35.4% 0.034 306.2), rgb(64, 55, 74).
Aa
White text reads best on this color (11.26:1).
About this color
#40374A is a dark, muted purple. In OKLCH its lightness is 35%, its chroma 0.034 and its hue 306°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Onyx (#343A40), ΔE 0.031 away. White text reads best on it, at 11.26:1.
| Hue family | Purples |
| Lightness | dark (35%) |
| Chroma | muted (0.034) |
| Temperature | in between |
| Nearest name | Onyx (#343A40) |
| Black text | 1.86:1 |
| White text | 11.26:1 |
Values
| HEX | #40374A |
| RGB | rgb(64, 55, 74) |
| HSL | hsl(268, 15%, 25%) |
| OKLCH | oklch(35.4% 0.034 306.2) |
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 #40374A | 11.26:1 | AAA | Lc -99.8 | Preferred for body text |
| Black text on #40374A | 1.86:1 | Fails | Lc 7.9 | Not readable |
| #40374A text on white | 11.26:1 | AAA | Lc 96.0 | Preferred for body text |
| #40374A text on black | 1.86:1 | Fails | Lc 0.0 | 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
#F6F5F7
oklch(97.1% 0.003 308.4)
-
Step 100
100
#EBE9EE
oklch(93.7% 0.007 304.2)
-
Step 200
200
#DBD7E1
oklch(88.5% 0.014 304.1)
-
Step 300
300
#C5BDCE
oklch(81% 0.025 306.9)
-
Step 400
400
#A79AB5
oklch(70.6% 0.041 307)
-
Step 500
500
#9182A3
oklch(63.2% 0.052 305.6)
-
Step 600
600
#7C6B8E
oklch(55.7% 0.057 306.7)
-
Step 700
700
#685979
oklch(49.1% 0.053 305.9)
-
Step 800
800
#554962
oklch(42.7% 0.043 306.5)
-
Step 900
900 (this color)
#40374A
oklch(35.4% 0.034 306.2)
-
Step 950
950
#29242F
oklch(27.1% 0.021 305.6)
#40374A 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) | #343A4B | 0.021 |
| Deuteranopia (no green cones) | #353B49 | 0.022 |
| Tritanopia (no blue cones) | #3F3A3E | 0.026 |
| Achromatopsia (no color) | #3B3B3B | 0.034 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40374A
#40374A
oklch(35.4% 0.034 306.2)
- #373F2B
#373F2B
oklch(35.4% 0.035 125.8)
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 #40374A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.031
- Charcoal Grey #3C4142 ΔE 0.040
- Gunmetal #293241 ΔE 0.046
- Dark Blue Grey #1F3B4D ΔE 0.049
- Space Cadet #2B2D42 ΔE 0.052
- Dark Grey Blue #29465B ΔE 0.054
- Charcoal #264653 ΔE 0.055
- Prussian Blue #1D3557 ΔE 0.058
Use #40374A 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.