#404B43
Closest named color: Dark Slate Gray (#2F4F4F). oklch(40% 0.019 153.9), rgb(64, 75, 67).
Aa
White text reads best on this color (9.10:1).
About this color
#404B43 is a dark close to neutral grey. In OKLCH its lightness is 40%, its chroma 0.019. It has too little chroma to lean warm or cool. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.027 away. White text reads best on it, at 9.10:1.
| Hue family | Neutrals |
| Lightness | dark (40%) |
| Chroma | close to neutral grey (0.019) |
| Temperature | neutral |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.30:1 |
| White text | 9.10:1 |
Values
| HEX | #404B43 |
| RGB | rgb(64, 75, 67) |
| HSL | hsl(136, 8%, 27%) |
| OKLCH | oklch(40% 0.019 153.9) |
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 #404B43 | 9.10:1 | AAA | Lc -95.3 | Preferred for body text |
| Black text on #404B43 | 2.30:1 | Fails | Lc 13.0 | Not readable |
| #404B43 text on white | 9.10:1 | AAA | Lc 91.0 | Preferred for body text |
| #404B43 text on black | 2.30:1 | Fails | Lc -11.4 | 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
#F4F6F5
oklch(97.1% 0.002 165.1)
-
Step 100
100
#E8EBE8
oklch(93.7% 0.005 145.5)
-
Step 200
200
#D5DBD7
oklch(88.6% 0.008 157.1)
-
Step 300
300
#BAC3BC
oklch(80.8% 0.014 152.5)
-
Step 400
400
#96A59A
oklch(70.7% 0.023 153.9)
-
Step 500
500
#7C8F81
oklch(63.1% 0.03 153.5)
-
Step 600
600
#65796B
oklch(55.6% 0.032 154.7)
-
Step 700
700
#546659
oklch(49.1% 0.03 153.8)
-
Step 800
800
#455349
oklch(42.7% 0.024 154.2)
-
Step 900
900 (this color)
#404B43
oklch(40% 0.019 153.9)
-
Step 950
950
#222824
oklch(26.9% 0.011 156.4)
#404B43 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) | #4B4943 | 0.018 |
| Deuteranopia (no green cones) | #494843 | 0.016 |
| Tritanopia (no blue cones) | #3E4B49 | 0.010 |
| Achromatopsia (no color) | #484848 | 0.019 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #404B43
#404B43
oklch(40% 0.019 153.9)
- #4F444C
#4F444C
oklch(40.1% 0.02 335.6)
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 #404B43, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.027
- Charcoal Grey #3C4142 ΔE 0.034
- Charcoal #264653 ΔE 0.049
- Dark Blue Green #005249 ΔE 0.055
- Dark Teal #014D4E ΔE 0.055
- Dark Grey Blue #29465B ΔE 0.056
- Deep Teal #00555A ΔE 0.059
- Onyx #343A40 ΔE 0.060
Use #404B43 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.