#424D5B
Closest named color: Dark Slate Gray (#2F4F4F). oklch(41.6% 0.027 254.6), rgb(66, 77, 91).
Aa
White text reads best on this color (8.59:1).
About this color
#424D5B is a dark close to neutral grey. In OKLCH its lightness is 42%, its chroma 0.027. It has too little chroma to lean warm or cool. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.036 away. White text reads best on it, at 8.59:1.
| Hue family | Neutrals |
| Lightness | dark (42%) |
| Chroma | close to neutral grey (0.027) |
| Temperature | neutral |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.44:1 |
| White text | 8.59:1 |
Values
| HEX | #424D5B |
| RGB | rgb(66, 77, 91) |
| HSL | hsl(214, 16%, 31%) |
| OKLCH | oklch(41.6% 0.027 254.6) |
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 #424D5B | 8.59:1 | AAA | Lc -94.0 | Preferred for body text |
| Black text on #424D5B | 2.44:1 | Fails | Lc 14.5 | Not readable |
| #424D5B text on white | 8.59:1 | AAA | Lc 89.5 | Fine for body text |
| #424D5B text on black | 2.44:1 | Fails | Lc -12.7 | 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
#D5D9DF
oklch(88.4% 0.009 258.3)
-
Step 300
300
#BAC1CB
oklch(80.8% 0.016 257.2)
-
Step 400
400
#96A2B1
oklch(70.8% 0.026 254)
-
Step 500
500
#7C8B9D
oklch(63.1% 0.032 253.1)
-
Step 600
600
#657588
oklch(55.6% 0.035 252.9)
-
Step 700
700
#546274
oklch(49.1% 0.034 254.8)
-
Step 800
800 (this color)
#424D5B
oklch(41.6% 0.027 254.6)
-
Step 900
900
#3A424D
oklch(37.6% 0.022 256.4)
-
Step 950
950
#22272D
oklch(27% 0.013 253)
#424D5B 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) | #484D5C | 0.009 |
| Deuteranopia (no green cones) | #454B5B | 0.007 |
| Tritanopia (no blue cones) | #3B5052 | 0.023 |
| Achromatopsia (no color) | #4C4C4C | 0.027 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #424D5B
#424D5B
oklch(41.6% 0.027 254.6)
- #554A3C
#554A3C
oklch(41.6% 0.027 73.6)
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 #424D5B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.036
- Dark Grey Blue #29465B ΔE 0.043
- Charcoal #264653 ΔE 0.047
- Charcoal Grey #3C4142 ΔE 0.051
- YInMn Blue #415A77 ΔE 0.053
- Dusty Grape #545775 ΔE 0.057
- Deep Teal #00555A ΔE 0.058
- Dark Teal #014D4E ΔE 0.065
Use #424D5B 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.