#424554
Closest named color: Charcoal Grey (#3C4142). oklch(39.4% 0.026 276.3), rgb(66, 69, 84).
Aa
White text reads best on this color (9.49:1).
About this color
#424554 is a dark close to neutral grey. In OKLCH its lightness is 39%, its chroma 0.026. It has too little chroma to lean warm or cool. The nearest named color is Charcoal Grey (#3C4142), ΔE 0.033 away. White text reads best on it, at 9.49:1.
| Hue family | Neutrals |
| Lightness | dark (39%) |
| Chroma | close to neutral grey (0.026) |
| Temperature | neutral |
| Nearest name | Charcoal Grey (#3C4142) |
| Black text | 2.21:1 |
| White text | 9.49:1 |
Values
| HEX | #424554 |
| RGB | rgb(66, 69, 84) |
| HSL | hsl(230, 12%, 29%) |
| OKLCH | oklch(39.4% 0.026 276.3) |
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 #424554 | 9.49:1 | AAA | Lc -96.3 | Preferred for body text |
| Black text on #424554 | 2.21:1 | Fails | Lc 12.0 | Not readable |
| #424554 text on white | 9.49:1 | AAA | Lc 92.0 | Preferred for body text |
| #424554 text on black | 2.21:1 | Fails | Lc -10.4 | 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
#E9E9EE
oklch(93.5% 0.007 286.3)
-
Step 200
200
#D7D9E0
oklch(88.6% 0.01 273.3)
-
Step 300
300
#BDC0CD
oklch(80.9% 0.018 275.6)
-
Step 400
400
#9B9FB4
oklch(70.6% 0.031 277)
-
Step 500
500
#8388A2
oklch(63.2% 0.039 276.6)
-
Step 600
600
#6C728D
oklch(55.7% 0.043 275.1)
-
Step 700
700
#5A5F78
oklch(49.1% 0.041 276)
-
Step 800
800
#4A4E61
oklch(42.8% 0.032 275.7)
-
Step 900
900 (this color)
#424554
oklch(39.4% 0.026 276.3)
-
Step 950
950
#24262F
oklch(27% 0.017 275.4)
#424554 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) | #414655 | 0.003 |
| Deuteranopia (no green cones) | #404554 | 0.003 |
| Tritanopia (no blue cones) | #3E484A | 0.023 |
| Achromatopsia (no color) | #464646 | 0.026 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #424554
#424554
oklch(39.4% 0.026 276.3)
- #4A4637
#4A4637
oklch(39.4% 0.025 94.9)
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 #424554, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal Grey #3C4142 ΔE 0.033
- Dark Grey Blue #29465B ΔE 0.035
- Charcoal #264653 ΔE 0.038
- Dark Slate Gray #2F4F4F ΔE 0.043
- Onyx #343A40 ΔE 0.051
- Dark Blue Grey #1F3B4D ΔE 0.063
- Dark Teal #014D4E ΔE 0.066
- Deep Teal #00555A ΔE 0.069
Use #424554 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.