#3F3744
Closest named color: Onyx (#343A40). oklch(35% 0.025 312.5), rgb(63, 55, 68).
Aa
White text reads best on this color (11.40:1).
About this color
#3F3744 is a dark close to neutral grey. In OKLCH its lightness is 35%, its chroma 0.025. It has too little chroma to lean warm or cool. The nearest named color is Onyx (#343A40), ΔE 0.023 away. White text reads best on it, at 11.40:1.
| Hue family | Neutrals |
| Lightness | dark (35%) |
| Chroma | close to neutral grey (0.025) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.84:1 |
| White text | 11.40:1 |
Values
| HEX | #3F3744 |
| RGB | rgb(63, 55, 68) |
| HSL | hsl(277, 11%, 24%) |
| OKLCH | oklch(35% 0.025 312.5) |
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 #3F3744 | 11.40:1 | AAA | Lc -100.0 | Preferred for body text |
| Black text on #3F3744 | 1.84:1 | Fails | Lc 7.6 | Not readable |
| #3F3744 text on white | 11.40:1 | AAA | Lc 96.3 | Preferred for body text |
| #3F3744 text on black | 1.84:1 | 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
#EBE9EC
oklch(93.6% 0.005 314.8)
-
Step 200
200
#DBD7DE
oklch(88.4% 0.01 311.2)
-
Step 300
300
#C5BDC9
oklch(80.9% 0.019 314.7)
-
Step 400
400
#A79CAE
oklch(70.8% 0.029 312.5)
-
Step 500
500
#91839A
oklch(63% 0.038 312.3)
-
Step 600
600
#7C6D85
oklch(55.7% 0.041 312.8)
-
Step 700
700
#685B71
oklch(49.2% 0.038 311.4)
-
Step 800
800
#554A5C
oklch(42.7% 0.032 312.2)
-
Step 900
900 (this color)
#3F3744
oklch(35% 0.025 312.5)
-
Step 950
950
#29242C
oklch(26.9% 0.016 312.9)
#3F3744 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) | #353945 | 0.017 |
| Deuteranopia (no green cones) | #373A44 | 0.016 |
| Tritanopia (no blue cones) | #3F383B | 0.017 |
| Achromatopsia (no color) | #3A3A3A | 0.025 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F3744
#3F3744
oklch(35% 0.025 312.5)
- #363D30
#363D30
oklch(34.9% 0.024 130.7)
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 #3F3744, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.023
- Charcoal Grey #3C4142 ΔE 0.034
- Gunmetal #293241 ΔE 0.042
- Dark Blue Grey #1F3B4D ΔE 0.048
- Space Cadet #2B2D42 ΔE 0.050
- Charcoal #264653 ΔE 0.055
- Dark Grey Blue #29465B ΔE 0.057
- Prussian Blue #1D3557 ΔE 0.062
Use #3F3744 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.