#404138
Closest named color: Charcoal Grey (#3C4142). oklch(37.1% 0.015 112.3), rgb(64, 65, 56).
Aa
White text reads best on this color (10.33:1).
About this color
#404138 is a dark close to neutral grey. In OKLCH its lightness is 37%, its chroma 0.015. It has too little chroma to lean warm or cool. The nearest named color is Charcoal Grey (#3C4142), ΔE 0.017 away. White text reads best on it, at 10.33:1.
| Hue family | Neutrals |
| Lightness | dark (37%) |
| Chroma | close to neutral grey (0.015) |
| Temperature | neutral |
| Nearest name | Charcoal Grey (#3C4142) |
| Black text | 2.03:1 |
| White text | 10.33:1 |
Values
| HEX | #404138 |
| RGB | rgb(64, 65, 56) |
| HSL | hsl(67, 7%, 24%) |
| OKLCH | oklch(37.1% 0.015 112.3) |
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 #404138 | 10.33:1 | AAA | Lc -98.0 | Preferred for body text |
| Black text on #404138 | 2.03:1 | Fails | Lc 9.9 | Not readable |
| #404138 text on white | 10.33:1 | AAA | Lc 94.0 | Preferred for body text |
| #404138 text on black | 2.03:1 | Fails | Lc -8.5 | 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
#F5F5F4
oklch(97% 0.001 106.4)
-
Step 100
100
#EAEAE8
oklch(93.6% 0.003 106.5)
-
Step 200
200
#D9D9D5
oklch(88.4% 0.005 106.5)
-
Step 300
300
#C0C1B9
oklch(80.8% 0.011 112.4)
-
Step 400
400
#A0A295
oklch(70.7% 0.019 114)
-
Step 500
500
#898B7B
oklch(63% 0.023 112.9)
-
Step 600
600
#737564
oklch(55.6% 0.026 112.7)
-
Step 700
700
#616253
oklch(49.1% 0.023 110.3)
-
Step 800
800
#4F5044
oklch(42.7% 0.019 111.1)
-
Step 900
900 (this color)
#404138
oklch(37.1% 0.015 112.3)
-
Step 950
950
#262722
oklch(27% 0.009 116.2)
#404138 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) | #434037 | 0.005 |
| Deuteranopia (no green cones) | #434038 | 0.006 |
| Tritanopia (no blue cones) | #41403E | 0.012 |
| Achromatopsia (no color) | #404040 | 0.015 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #404138
#404138
oklch(37.1% 0.015 112.3)
- #403F48
#403F48
oklch(37.2% 0.015 290.7)
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 #404138, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal Grey #3C4142 ΔE 0.017
- Onyx #343A40 ΔE 0.037
- Dark Slate Gray #2F4F4F ΔE 0.050
- Charcoal #264653 ΔE 0.052
- Dark Grey Blue #29465B ΔE 0.062
- Dark Blue Grey #1F3B4D ΔE 0.065
- Dark Teal #014D4E ΔE 0.065
- Dark Olive #373E02 ΔE 0.068
Use #404138 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.