#404A3F
Closest named color: Dark Slate Gray (#2F4F4F). oklch(39.7% 0.022 142.7), rgb(64, 74, 63).
Aa
White text reads best on this color (9.25:1).
About this color
#404A3F is a dark close to neutral grey. In OKLCH its lightness is 40%, its chroma 0.022. It has too little chroma to lean warm or cool. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.031 away. White text reads best on it, at 9.25:1.
| Hue family | Neutrals |
| Lightness | dark (40%) |
| Chroma | close to neutral grey (0.022) |
| Temperature | neutral |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.26:1 |
| White text | 9.25:1 |
Values
| HEX | #404A3F |
| RGB | rgb(64, 74, 63) |
| HSL | hsl(115, 8%, 27%) |
| OKLCH | oklch(39.7% 0.022 142.7) |
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 #404A3F | 9.25:1 | AAA | Lc -95.7 | Preferred for body text |
| Black text on #404A3F | 2.26:1 | Fails | Lc 12.6 | Not readable |
| #404A3F text on white | 9.25:1 | AAA | Lc 91.4 | Preferred for body text |
| #404A3F text on black | 2.26:1 | Fails | Lc -11.0 | 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
#F4F6F4
oklch(97.1% 0.003 145.5)
-
Step 100
100
#E8EBE8
oklch(93.7% 0.005 145.5)
-
Step 200
200
#D6DBD5
oklch(88.6% 0.01 140.5)
-
Step 300
300
#BBC4BA
oklch(81% 0.017 142.5)
-
Step 400
400
#97A596
oklch(70.6% 0.027 143.4)
-
Step 500
500
#7E8F7C
oklch(63.1% 0.034 142.3)
-
Step 600
600
#677965
oklch(55.5% 0.037 142.4)
-
Step 700
700
#566654
oklch(49.1% 0.034 142)
-
Step 800
800
#465345
oklch(42.6% 0.028 143.2)
-
Step 900
900 (this color)
#404A3F
oklch(39.7% 0.022 142.7)
-
Step 950
950
#232822
oklch(27% 0.013 140.5)
#404A3F 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) | #4B483E | 0.018 |
| Deuteranopia (no green cones) | #494740 | 0.017 |
| Tritanopia (no blue cones) | #3F4947 | 0.015 |
| Achromatopsia (no color) | #474747 | 0.022 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #404A3F
#404A3F
oklch(39.7% 0.022 142.7)
- #4D434E
#4D434E
oklch(39.7% 0.022 323.1)
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 #404A3F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.031
- Charcoal Grey #3C4142 ΔE 0.033
- Charcoal #264653 ΔE 0.051
- Dark Blue Green #005249 ΔE 0.055
- Dark Teal #014D4E ΔE 0.057
- Onyx #343A40 ΔE 0.059
- Dark Grey Blue #29465B ΔE 0.060
- Deep Teal #00555A ΔE 0.062
Use #404A3F 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.