#39404F
Closest named color: Charcoal Grey (#3C4142). oklch(37.1% 0.028 265.4), rgb(57, 64, 79).
Aa
White text reads best on this color (10.39:1).
About this color
#39404F is a dark close to neutral grey. In OKLCH its lightness is 37%, its chroma 0.028. It has too little chroma to lean warm or cool. The nearest named color is Charcoal Grey (#3C4142), ΔE 0.024 away. White text reads best on it, at 10.39:1.
| Hue family | Neutrals |
| Lightness | dark (37%) |
| Chroma | close to neutral grey (0.028) |
| Temperature | neutral |
| Nearest name | Charcoal Grey (#3C4142) |
| Black text | 2.02:1 |
| White text | 10.39:1 |
Values
| HEX | #39404F |
| RGB | rgb(57, 64, 79) |
| HSL | hsl(221, 16%, 27%) |
| OKLCH | oklch(37.1% 0.028 265.4) |
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 #39404F | 10.39:1 | AAA | Lc -98.1 | Preferred for body text |
| Black text on #39404F | 2.02:1 | Fails | Lc 9.8 | Not readable |
| #39404F text on white | 10.39:1 | AAA | Lc 94.1 | Preferred for body text |
| #39404F text on black | 2.02:1 | Fails | Lc -8.4 | 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
#F4F5F7
oklch(97% 0.003 264.5)
-
Step 100
100
#E8EAEE
oklch(93.7% 0.006 264.5)
-
Step 200
200
#D5D9E1
oklch(88.5% 0.012 264.5)
-
Step 300
300
#BAC1CE
oklch(80.9% 0.02 263)
-
Step 400
400
#97A1B6
oklch(70.8% 0.033 265.2)
-
Step 500
500
#7D89A4
oklch(63% 0.043 266.3)
-
Step 600
600
#66738F
oklch(55.5% 0.046 265.4)
-
Step 700
700
#55617A
oklch(49.2% 0.043 264.8)
-
Step 800
800
#464F63
oklch(42.8% 0.035 265.9)
-
Step 900
900 (this color)
#39404F
oklch(37.1% 0.028 265.4)
-
Step 950
950
#22262F
oklch(26.9% 0.018 266.3)
#39404F 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) | #3B4150 | 0.005 |
| Deuteranopia (no green cones) | #393F4F | 0.003 |
| Tritanopia (no blue cones) | #334345 | 0.025 |
| Achromatopsia (no color) | #404040 | 0.028 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #39404F
#39404F
oklch(37.1% 0.028 265.4)
- #473F2F
#473F2F
oklch(37.1% 0.028 84.4)
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 #39404F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal Grey #3C4142 ΔE 0.024
- Charcoal #264653 ΔE 0.029
- Dark Grey Blue #29465B ΔE 0.029
- Onyx #343A40 ΔE 0.030
- Dark Blue Grey #1F3B4D ΔE 0.041
- Dark Slate Gray #2F4F4F ΔE 0.050
- Gunmetal #293241 ΔE 0.056
- Midnight Green #073B4C ΔE 0.059
Use #39404F 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.