#424B66
Closest named color: Dark Grey Blue (#29465B). oklch(41.6% 0.047 270), rgb(66, 75, 102).
Aa
White text reads best on this color (8.64:1).
About this color
#424B66 is a dark, muted blue. In OKLCH its lightness is 42%, its chroma 0.047 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.043 away. White text reads best on it, at 8.64:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | muted (0.047) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.42:1 |
| White text | 8.64:1 |
Values
| HEX | #424B66 |
| RGB | rgb(66, 75, 102) |
| HSL | hsl(225, 21%, 33%) |
| OKLCH | oklch(41.6% 0.047 270) |
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 #424B66 | 8.64:1 | AAA | Lc -94.2 | Preferred for body text |
| Black text on #424B66 | 2.42:1 | Fails | Lc 14.3 | Not readable |
| #424B66 text on white | 8.64:1 | AAA | Lc 89.7 | Fine for body text |
| #424B66 text on black | 2.42:1 | Fails | Lc -12.6 | 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
#F4F5F8
oklch(97% 0.004 271.4)
-
Step 100
100
#E8EAEF
oklch(93.7% 0.007 268.5)
-
Step 200
200
#D5D9E4
oklch(88.5% 0.016 270)
-
Step 300
300
#B9C0D3
oklch(80.8% 0.028 269.6)
-
Step 400
400
#96A0BD
oklch(70.8% 0.044 270.3)
-
Step 500
500
#7C88AC
oklch(63% 0.056 270.4)
-
Step 600
600
#657298
oklch(55.6% 0.061 269.7)
-
Step 700
700
#545F81
oklch(49% 0.056 270.4)
-
Step 800
800 (this color)
#424B66
oklch(41.6% 0.047 270)
-
Step 900
900
#3A4155
oklch(37.7% 0.036 269.6)
-
Step 950
950
#222632
oklch(27% 0.023 270.4)
#424B66 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) | #424D67 | 0.006 |
| Deuteranopia (no green cones) | #3F4A65 | 0.006 |
| Tritanopia (no blue cones) | #385054 | 0.042 |
| Achromatopsia (no color) | #4C4C4C | 0.047 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #424B66
#424B66
oklch(41.6% 0.047 270)
- #564B2E
#564B2E
oklch(41.6% 0.046 89.5)
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 #424B66, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.043
- YInMn Blue #415A77 ΔE 0.047
- Dusty Grape #545775 ΔE 0.051
- Dusk #4E5481 ΔE 0.052
- Charcoal #264653 ΔE 0.053
- Dark Slate Gray #2F4F4F ΔE 0.053
- Charcoal Grey #3C4142 ΔE 0.063
- Light Navy #155084 ΔE 0.063
Use #424B66 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.