#404B56
Closest named color: Dark Slate Gray (#2F4F4F). oklch(40.7% 0.023 248.4), rgb(64, 75, 86).
Aa
White text reads best on this color (8.90:1).
About this color
#404B56 is a dark close to neutral grey. In OKLCH its lightness is 41%, its chroma 0.023. It has too little chroma to lean warm or cool. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.030 away. White text reads best on it, at 8.90:1.
| Hue family | Neutrals |
| Lightness | dark (41%) |
| Chroma | close to neutral grey (0.023) |
| Temperature | neutral |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.35:1 |
| White text | 8.90:1 |
Values
| HEX | #404B56 |
| RGB | rgb(64, 75, 86) |
| HSL | hsl(210, 15%, 29%) |
| OKLCH | oklch(40.7% 0.023 248.4) |
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 #404B56 | 8.90:1 | AAA | Lc -94.8 | Preferred for body text |
| Black text on #404B56 | 2.35:1 | Fails | Lc 13.6 | Not readable |
| #404B56 text on white | 8.90:1 | AAA | Lc 90.4 | Preferred for body text |
| #404B56 text on black | 2.35:1 | Fails | Lc -11.9 | 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 800.
-
Step 50
50
#F4F5F7
oklch(97% 0.003 264.5)
-
Step 100
100
#E8EAEC
oklch(93.6% 0.003 247.9)
-
Step 200
200
#D5DADE
oklch(88.6% 0.008 241.7)
-
Step 300
300
#BAC2C9
oklch(81% 0.013 244.3)
-
Step 400
400
#96A2AE
oklch(70.7% 0.022 248.1)
-
Step 500
500
#7D8B9A
oklch(63.1% 0.028 250.1)
-
Step 600
600
#667585
oklch(55.6% 0.031 250.1)
-
Step 700
700
#546270
oklch(49% 0.028 248.4)
-
Step 800
800 (this color)
#404B56
oklch(40.7% 0.023 248.4)
-
Step 900
900
#3A434B
oklch(37.8% 0.018 245.1)
-
Step 950
950
#22272C
oklch(27% 0.012 248.3)
#404B56 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) | #474B57 | 0.011 |
| Deuteranopia (no green cones) | #444956 | 0.008 |
| Tritanopia (no blue cones) | #3A4E4E | 0.021 |
| Achromatopsia (no color) | #4A4A4A | 0.023 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #404B56
#404B56
oklch(40.7% 0.023 248.4)
- #52483C
#52483C
oklch(40.8% 0.024 72.2)
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 #404B56, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.030
- Dark Grey Blue #29465B ΔE 0.038
- Charcoal #264653 ΔE 0.040
- Charcoal Grey #3C4142 ΔE 0.041
- Deep Teal #00555A ΔE 0.056
- Dark Teal #014D4E ΔE 0.060
- YInMn Blue #415A77 ΔE 0.062
- Onyx #343A40 ΔE 0.063
Use #404B56 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.