#404A51
Closest named color: Dark Slate Gray (#2F4F4F). oklch(40.3% 0.018 238.5), rgb(64, 74, 81).
Aa
White text reads best on this color (9.06:1).
About this color
#404A51 is a dark close to neutral grey. In OKLCH its lightness is 40%, its chroma 0.018. It has too little chroma to lean warm or cool. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.028 away. White text reads best on it, at 9.06:1.
| Hue family | Neutrals |
| Lightness | dark (40%) |
| Chroma | close to neutral grey (0.018) |
| Temperature | neutral |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.31:1 |
| White text | 9.06:1 |
Values
| HEX | #404A51 |
| RGB | rgb(64, 74, 81) |
| HSL | hsl(205, 12%, 28%) |
| OKLCH | oklch(40.3% 0.018 238.5) |
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 #404A51 | 9.06:1 | AAA | Lc -95.2 | Preferred for body text |
| Black text on #404A51 | 2.31:1 | Fails | Lc 13.1 | Not readable |
| #404A51 text on white | 9.06:1 | AAA | Lc 90.9 | Preferred for body text |
| #404A51 text on black | 2.31:1 | Fails | Lc -11.5 | 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
#F5F5F6
oklch(97% 0.001 286.4)
-
Step 100
100
#E8EAEB
oklch(93.6% 0.003 228.8)
-
Step 200
200
#D6DADC
oklch(88.6% 0.005 228.8)
-
Step 300
300
#BBC2C6
oklch(81% 0.01 232.4)
-
Step 400
400
#98A2AA
oklch(70.7% 0.016 241.9)
-
Step 500
500
#7E8C95
oklch(63.2% 0.021 235.9)
-
Step 600
600
#67767F
oklch(55.7% 0.023 234.2)
-
Step 700
700
#56636C
oklch(49.2% 0.022 238.2)
-
Step 800
800 (this color)
#404A51
oklch(40.3% 0.018 238.5)
-
Step 900
900
#3B4348
oklch(37.7% 0.014 235.2)
-
Step 950
950
#23272A
oklch(27% 0.008 240.2)
#404A51 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) | #474A51 | 0.011 |
| Deuteranopia (no green cones) | #454851 | 0.009 |
| Tritanopia (no blue cones) | #3B4C4C | 0.014 |
| Achromatopsia (no color) | #494949 | 0.018 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #404A51
#404A51
oklch(40.3% 0.018 238.5)
- #50463F
#50463F
oklch(40.2% 0.018 57.2)
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 #404A51, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.028
- Charcoal Grey #3C4142 ΔE 0.034
- Charcoal #264653 ΔE 0.039
- Dark Grey Blue #29465B ΔE 0.039
- Deep Teal #00555A ΔE 0.057
- Dark Teal #014D4E ΔE 0.057
- Onyx #343A40 ΔE 0.058
- Dark Blue Green #005249 ΔE 0.063
Use #404A51 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.