#404C58
Closest named color: Dark Slate Gray (#2F4F4F). oklch(41.1% 0.025 248.4), rgb(64, 76, 88).
Aa
White text reads best on this color (8.77:1).
About this color
#404C58 is a dark close to neutral grey. In OKLCH its lightness is 41%, its chroma 0.025. 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 8.77:1.
| Hue family | Neutrals |
| Lightness | dark (41%) |
| Chroma | close to neutral grey (0.025) |
| Temperature | neutral |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.39:1 |
| White text | 8.77:1 |
Values
| HEX | #404C58 |
| RGB | rgb(64, 76, 88) |
| HSL | hsl(210, 16%, 30%) |
| OKLCH | oklch(41.1% 0.025 248.4) |
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 #404C58 | 8.77:1 | AAA | Lc -94.5 | Preferred for body text |
| Black text on #404C58 | 2.39:1 | Fails | Lc 13.9 | Not readable |
| #404C58 text on white | 8.77:1 | AAA | Lc 90.1 | Preferred for body text |
| #404C58 text on black | 2.39:1 | Fails | Lc -12.2 | 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
#E8EAED
oklch(93.6% 0.005 258.3)
-
Step 200
200
#D5DADE
oklch(88.6% 0.008 241.7)
-
Step 300
300
#B9C2CA
oklch(80.9% 0.015 244.8)
-
Step 400
400
#95A2AF
oklch(70.6% 0.024 248.2)
-
Step 500
500
#7C8B9B
oklch(63% 0.03 250)
-
Step 600
600
#657586
oklch(55.5% 0.033 250)
-
Step 700
700
#536372
oklch(49.2% 0.031 246.7)
-
Step 800
800 (this color)
#404C58
oklch(41.1% 0.025 248.4)
-
Step 900
900
#3A434C
oklch(37.8% 0.019 248.3)
-
Step 950
950
#22272C
oklch(27% 0.012 248.3)
#404C58 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) | #474C59 | 0.011 |
| Deuteranopia (no green cones) | #454A58 | 0.009 |
| Tritanopia (no blue cones) | #394F50 | 0.022 |
| Achromatopsia (no color) | #4B4B4B | 0.025 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #404C58
#404C58
oklch(41.1% 0.025 248.4)
- #54483C
#54483C
oklch(41% 0.025 67)
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 #404C58, 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
- Dark Grey Blue #29465B ΔE 0.039
- Charcoal #264653 ΔE 0.042
- Charcoal Grey #3C4142 ΔE 0.045
- Deep Teal #00555A ΔE 0.055
- YInMn Blue #415A77 ΔE 0.058
- Dark Teal #014D4E ΔE 0.061
- Dusty Grape #545775 ΔE 0.063
Use #404C58 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.