#3F374B
Closest named color: Onyx (#343A40). oklch(35.3% 0.036 302.9), rgb(63, 55, 75).
Aa
White text reads best on this color (11.29:1).
About this color
#3F374B is a dark, muted purple. In OKLCH its lightness is 35%, its chroma 0.036 and its hue 303°. 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 11.29:1.
| Hue family | Purples |
| Lightness | dark (35%) |
| Chroma | muted (0.036) |
| Temperature | in between |
| Nearest name | Onyx (#343A40) |
| Black text | 1.85:1 |
| White text | 11.29:1 |
Values
| HEX | #3F374B |
| RGB | rgb(63, 55, 75) |
| HSL | hsl(264, 15%, 25%) |
| OKLCH | oklch(35.3% 0.036 302.9) |
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 #3F374B | 11.29:1 | AAA | Lc -99.8 | Preferred for body text |
| Black text on #3F374B | 1.85:1 | Fails | Lc 7.8 | Not readable |
| #3F374B text on white | 11.29:1 | AAA | Lc 96.1 | Preferred for body text |
| #3F374B text on black | 1.85:1 | 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
#C4BDCF
oklch(81% 0.026 303.4)
-
Step 400
400
#A69BB7
oklch(70.8% 0.042 303.2)
-
Step 500
500
#9082A5
oklch(63.1% 0.054 303.1)
-
Step 600
600
#7A6B90
oklch(55.6% 0.059 303.1)
-
Step 700
700
#67597B
oklch(49.1% 0.056 303.2)
-
Step 800
800
#544964
oklch(42.7% 0.046 303.1)
-
Step 900
900 (this color)
#3F374B
oklch(35.3% 0.036 302.9)
-
Step 950
950
#292430
oklch(27.1% 0.023 303.9)
#3F374B 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) | #333A4C | 0.021 |
| Deuteranopia (no green cones) | #353A4A | 0.019 |
| Tritanopia (no blue cones) | #3D3A3E | 0.028 |
| Achromatopsia (no color) | #3A3A3A | 0.036 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F374B
#3F374B
oklch(35.3% 0.036 302.9)
- #383F2A
#383F2A
oklch(35.5% 0.036 123.2)
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 #3F374B, 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 0.041
- Gunmetal #293241 ΔE 0.045
- Dark Blue Grey #1F3B4D ΔE 0.047
- Space Cadet #2B2D42 ΔE 0.051
- Dark Grey Blue #29465B ΔE 0.053
- Charcoal #264653 ΔE 0.054
- Prussian Blue #1D3557 ΔE 0.056
Use #3F374B 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.