#404639
Closest named color: Charcoal Grey (#3C4142). oklch(38.4% 0.023 127.7), rgb(64, 70, 57).
Aa
White text reads best on this color (9.75:1).
About this color
#404639 is a dark close to neutral grey. In OKLCH its lightness is 38%, its chroma 0.023. It has too little chroma to lean warm or cool. The nearest named color is Charcoal Grey (#3C4142), ΔE 0.027 away. White text reads best on it, at 9.75:1.
| Hue family | Neutrals |
| Lightness | dark (38%) |
| Chroma | close to neutral grey (0.023) |
| Temperature | neutral |
| Nearest name | Charcoal Grey (#3C4142) |
| Black text | 2.15:1 |
| White text | 9.75:1 |
Values
| HEX | #404639 |
| RGB | rgb(64, 70, 57) |
| HSL | hsl(88, 10%, 25%) |
| OKLCH | oklch(38.4% 0.023 127.7) |
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 #404639 | 9.75:1 | AAA | Lc -96.8 | Preferred for body text |
| Black text on #404639 | 2.15:1 | Fails | Lc 11.3 | Not readable |
| #404639 text on white | 9.75:1 | AAA | Lc 92.6 | Preferred for body text |
| #404639 text on black | 2.15:1 | Fails | Lc -9.8 | 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
#F5F6F4
oklch(97.2% 0.003 128.5)
-
Step 100
100
#E9EAE7
oklch(93.5% 0.004 121.6)
-
Step 200
200
#D7DAD4
oklch(88.4% 0.009 128.6)
-
Step 300
300
#BDC3B7
oklch(80.9% 0.018 128.7)
-
Step 400
400
#9CA492
oklch(70.7% 0.027 126.7)
-
Step 500
500
#838E77
oklch(63.1% 0.036 128.3)
-
Step 600
600
#6D7860
oklch(55.6% 0.038 127.7)
-
Step 700
700
#5B654F
oklch(49.2% 0.036 127.6)
-
Step 800
800
#4A5241
oklch(42.6% 0.029 128.1)
-
Step 900
900 (this color)
#404639
oklch(38.4% 0.023 127.7)
-
Step 950
950
#242820
oklch(27% 0.016 129.1)
#404639 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) | #474438 | 0.012 |
| Deuteranopia (no green cones) | #47443A | 0.013 |
| Tritanopia (no blue cones) | #414542 | 0.017 |
| Achromatopsia (no color) | #444444 | 0.023 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #404639
#404639
oklch(38.4% 0.023 127.7)
- #47404D
#47404D
oklch(38.4% 0.024 309.4)
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 #404639, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal Grey #3C4142 ΔE 0.027
- Dark Slate Gray #2F4F4F ΔE 0.041
- Onyx #343A40 ΔE 0.050
- Charcoal #264653 ΔE 0.053
- Dark Teal #014D4E ΔE 0.060
- Dark Blue Green #005249 ΔE 0.061
- Dark Grey Blue #29465B ΔE 0.063
- Dark Olive #373E02 ΔE 0.068
Use #404639 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.