#3F3758
Closest named color: Onyx (#343A40). oklch(36% 0.057 294.5), rgb(63, 55, 88).
Aa
White text reads best on this color (11.05:1).
About this color
#3F3758 is a dark, muted purple. In OKLCH its lightness is 36%, its chroma 0.057 and its hue 295°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Onyx (#343A40), ΔE 0.051 away. White text reads best on it, at 11.05:1.
| Hue family | Purples |
| Lightness | dark (36%) |
| Chroma | muted (0.057) |
| Temperature | in between |
| Nearest name | Onyx (#343A40) |
| Black text | 1.89:1 |
| White text | 11.05:1 |
Values
| HEX | #3F3758 |
| RGB | rgb(63, 55, 88) |
| HSL | hsl(255, 23%, 28%) |
| OKLCH | oklch(36% 0.057 294.5) |
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 #3F3758 | 11.05:1 | AAA | Lc -99.4 | Preferred for body text |
| Black text on #3F3758 | 1.89:1 | Fails | Lc 8.4 | Not readable |
| #3F3758 text on white | 11.05:1 | AAA | Lc 95.5 | Preferred for body text |
| #3F3758 text on black | 1.89:1 | 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
#F5F5F9
oklch(97.1% 0.005 286.3)
-
Step 100
100
#EAE8F1
oklch(93.5% 0.012 296.3)
-
Step 200
200
#DAD6E8
oklch(88.5% 0.025 296.1)
-
Step 300
300
#C2BCDA
oklch(81% 0.042 294.6)
-
Step 400
400
#A399C7
oklch(70.8% 0.067 294.6)
-
Step 500
500
#8D7FB9
oklch(63.1% 0.087 294.9)
-
Step 600
600
#7768A5
oklch(55.7% 0.094 294.4)
-
Step 700
700
#64568D
oklch(49.1% 0.087 294.7)
-
Step 800
800
#524773
oklch(42.8% 0.072 294.6)
-
Step 900
900 (this color)
#3F3758
oklch(36% 0.057 294.5)
-
Step 950
950
#272336
oklch(27% 0.035 293.6)
#3F3758 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) | #2E3C59 | 0.029 |
| Deuteranopia (no green cones) | #2F3B57 | 0.028 |
| Tritanopia (no blue cones) | #3A3D43 | 0.048 |
| Achromatopsia (no color) | #3C3C3C | 0.057 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F3758
#3F3758
oklch(36% 0.057 294.5)
- #3C411B
#3C411B
oklch(36.1% 0.058 115.6)
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 #3F3758, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.051
- Prussian Blue #1D3557 ΔE 0.052
- Dark Grey Blue #29465B ΔE 0.053
- Dark Blue Grey #1F3B4D ΔE 0.054
- Charcoal Grey #3C4142 ΔE 0.057
- Gunmetal #293241 ΔE 0.058
- Charcoal #264653 ΔE 0.059
- Space Cadet #2B2D42 ΔE 0.060
Use #3F3758 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.