#403F58
Closest named color: Dark Grey Blue (#29465B). oklch(37.9% 0.042 286), rgb(64, 63, 88).
Aa
White text reads best on this color (10.14:1).
About this color
#403F58 is a dark, muted purple. In OKLCH its lightness is 38%, its chroma 0.042 and its hue 286°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.036 away. White text reads best on it, at 10.14:1.
| Hue family | Purples |
| Lightness | dark (38%) |
| Chroma | muted (0.042) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.06:1 |
| White text | 10.14:1 |
Values
| HEX | #403F58 |
| RGB | rgb(64, 63, 88) |
| HSL | hsl(242, 17%, 30%) |
| OKLCH | oklch(37.9% 0.042 286) |
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 #403F58 | 10.14:1 | AAA | Lc -97.6 | Preferred for body text |
| Black text on #403F58 | 2.06:1 | Fails | Lc 10.4 | Not readable |
| #403F58 text on white | 10.14:1 | AAA | Lc 93.6 | Preferred for body text |
| #403F58 text on black | 2.06:1 | 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
#F5F5F8
oklch(97.1% 0.004 286.3)
-
Step 100
100
#E9E9F0
oklch(93.6% 0.009 286.2)
-
Step 200
200
#D8D8E5
oklch(88.6% 0.018 286)
-
Step 300
300
#BEBED5
oklch(80.9% 0.032 285.7)
-
Step 400
400
#9D9CC0
oklch(70.6% 0.052 286.3)
-
Step 500
500
#8684B0
oklch(63.1% 0.066 286.4)
-
Step 600
600
#6F6D9B
oklch(55.5% 0.071 285.8)
-
Step 700
700
#5D5B85
oklch(49.1% 0.067 285.8)
-
Step 800
800
#4C4B6C
oklch(42.8% 0.054 285.2)
-
Step 900
900 (this color)
#403F58
oklch(37.9% 0.042 286)
-
Step 950
950
#252533
oklch(27.1% 0.026 284.5)
#403F58 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) | #384259 | 0.014 |
| Deuteranopia (no green cones) | #384157 | 0.014 |
| Tritanopia (no blue cones) | #3B4348 | 0.035 |
| Achromatopsia (no color) | #414141 | 0.043 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403F58
#403F58
oklch(37.9% 0.042 286)
- #454429
#454429
oklch(38% 0.042 106.4)
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 #403F58, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.036
- Charcoal Grey #3C4142 ΔE 0.042
- Charcoal #264653 ΔE 0.043
- Onyx #343A40 ΔE 0.047
- Dark Blue Grey #1F3B4D ΔE 0.054
- Dark Slate Gray #2F4F4F ΔE 0.062
- Prussian Blue #1D3557 ΔE 0.063
- Gunmetal #293241 ΔE 0.067
Use #403F58 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.