#424551
Closest named color: Charcoal Grey (#3C4142). oklch(39.2% 0.021 274.3), rgb(66, 69, 81).
Aa
White text reads best on this color (9.53:1).
About this color
#424551 is a dark close to neutral grey. In OKLCH its lightness is 39%, its chroma 0.021. It has too little chroma to lean warm or cool. The nearest named color is Charcoal Grey (#3C4142), ΔE 0.028 away. White text reads best on it, at 9.53:1.
| Hue family | Neutrals |
| Lightness | dark (39%) |
| Chroma | close to neutral grey (0.021) |
| Temperature | neutral |
| Nearest name | Charcoal Grey (#3C4142) |
| Black text | 2.20:1 |
| White text | 9.53:1 |
Values
| HEX | #424551 |
| RGB | rgb(66, 69, 81) |
| HSL | hsl(228, 10%, 29%) |
| OKLCH | oklch(39.2% 0.021 274.3) |
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 #424551 | 9.53:1 | AAA | Lc -96.3 | Preferred for body text |
| Black text on #424551 | 2.20:1 | Fails | Lc 11.9 | Not readable |
| #424551 text on white | 9.53:1 | AAA | Lc 92.1 | Preferred for body text |
| #424551 text on black | 2.20:1 | Fails | Lc -10.3 | 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
#F5F5F7
oklch(97.1% 0.003 286.4)
-
Step 100
100
#E9EAED
oklch(93.7% 0.004 271.4)
-
Step 200
200
#D7D9DF
oklch(88.6% 0.008 271.3)
-
Step 300
300
#BDC0CB
oklch(80.9% 0.016 273.8)
-
Step 400
400
#9CA0B1
oklch(70.8% 0.025 275.2)
-
Step 500
500
#83889D
oklch(63% 0.032 274.9)
-
Step 600
600
#6D7288
oklch(55.6% 0.035 275.1)
-
Step 700
700
#5B6073
oklch(49.2% 0.031 273.6)
-
Step 800
800
#4A4E5E
oklch(42.6% 0.027 274.2)
-
Step 900
900 (this color)
#424551
oklch(39.2% 0.021 274.3)
-
Step 950
950
#24262D
oklch(27% 0.013 272.9)
#424551 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) | #424652 | 0.003 |
| Deuteranopia (no green cones) | #414551 | 0.002 |
| Tritanopia (no blue cones) | #3F4749 | 0.018 |
| Achromatopsia (no color) | #454545 | 0.021 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #424551
#424551
oklch(39.2% 0.021 274.3)
- #494639
#494639
oklch(39.3% 0.021 96.5)
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 #424551, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal Grey #3C4142 ΔE 0.028
- Dark Grey Blue #29465B ΔE 0.037
- Charcoal #264653 ΔE 0.038
- Dark Slate Gray #2F4F4F ΔE 0.041
- Onyx #343A40 ΔE 0.048
- Dark Blue Grey #1F3B4D ΔE 0.062
- Dark Teal #014D4E ΔE 0.065
- Deep Teal #00555A ΔE 0.069
Use #424551 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.