#424B58
Closest named color: Dark Slate Gray (#2F4F4F). oklch(41% 0.025 257.5), rgb(66, 75, 88).
Aa
White text reads best on this color (8.82:1).
About this color
#424B58 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 0.035 away. White text reads best on it, at 8.82:1.
| Hue family | Neutrals |
| Lightness | dark (41%) |
| Chroma | close to neutral grey (0.025) |
| Temperature | neutral |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.37:1 |
| White text | 8.82:1 |
Values
| HEX | #424B58 |
| RGB | rgb(66, 75, 88) |
| HSL | hsl(215, 14%, 30%) |
| OKLCH | oklch(41% 0.025 257.5) |
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 #424B58 | 8.82:1 | AAA | Lc -94.7 | Preferred for body text |
| Black text on #424B58 | 2.37:1 | Fails | Lc 13.8 | Not readable |
| #424B58 text on white | 8.82:1 | AAA | Lc 90.2 | Preferred for body text |
| #424B58 text on black | 2.37:1 | Fails | Lc -12.1 | 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
#F5F5F7
oklch(97.1% 0.003 286.4)
-
Step 100
100
#E8EAED
oklch(93.6% 0.005 258.3)
-
Step 200
200
#D6D9DE
oklch(88.4% 0.008 260.7)
-
Step 300
300
#BBC1CA
oklch(80.9% 0.014 258.4)
-
Step 400
400
#98A1AF
oklch(70.6% 0.023 259.2)
-
Step 500
500
#7E8A9C
oklch(63% 0.031 258.4)
-
Step 600
600
#687486
oklch(55.5% 0.032 258.4)
-
Step 700
700
#566272
oklch(49.2% 0.03 255.7)
-
Step 800
800 (this color)
#424B58
oklch(41% 0.025 257.5)
-
Step 900
900
#3B424C
oklch(37.7% 0.02 257.3)
-
Step 950
950
#23272D
oklch(27.1% 0.013 258.4)
#424B58 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) | #474B59 | 0.008 |
| Deuteranopia (no green cones) | #444958 | 0.007 |
| Tritanopia (no blue cones) | #3C4E4F | 0.023 |
| Achromatopsia (no color) | #4A4A4A | 0.025 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #424B58
#424B58
oklch(41% 0.025 257.5)
- #52493B
#52493B
oklch(41% 0.025 78.8)
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 #424B58, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.035
- Dark Grey Blue #29465B ΔE 0.040
- Charcoal #264653 ΔE 0.043
- Charcoal Grey #3C4142 ΔE 0.044
- YInMn Blue #415A77 ΔE 0.059
- Deep Teal #00555A ΔE 0.059
- Dusty Grape #545775 ΔE 0.063
- Dark Teal #014D4E ΔE 0.064
Use #424B58 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.