#424F66
Closest named color: YInMn Blue (#415A77). oklch(42.6% 0.042 261.7), rgb(66, 79, 102).
Aa
White text reads best on this color (8.26:1).
About this color
#424F66 is a dark, muted blue. In OKLCH its lightness is 43%, its chroma 0.042 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is YInMn Blue (#415A77), ΔE 0.038 away. White text reads best on it, at 8.26:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | muted (0.042) |
| Temperature | cool |
| Nearest name | YInMn Blue (#415A77) |
| Black text | 2.54:1 |
| White text | 8.26:1 |
Values
| HEX | #424F66 |
| RGB | rgb(66, 79, 102) |
| HSL | hsl(218, 21%, 33%) |
| OKLCH | oklch(42.6% 0.042 261.7) |
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 #424F66 | 8.26:1 | AAA | Lc -93.1 | Preferred for body text |
| Black text on #424F66 | 2.54:1 | Fails | Lc 15.5 | Dividers and decoration only |
| #424F66 text on white | 8.26:1 | AAA | Lc 88.5 | Fine for body text |
| #424F66 text on black | 2.54:1 | Fails | Lc -13.7 | 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
#F4F5F8
oklch(97% 0.004 271.4)
-
Step 100
100
#E7EAEF
oklch(93.6% 0.007 260.7)
-
Step 200
200
#D4D9E2
oklch(88.4% 0.013 262.4)
-
Step 300
300
#B8C1D1
oklch(80.9% 0.025 262.1)
-
Step 400
400
#93A1BA
oklch(70.6% 0.04 262.1)
-
Step 500
500
#798AA8
oklch(63.1% 0.049 261.7)
-
Step 600
600
#627494
oklch(55.7% 0.054 261.8)
-
Step 700
700
#51617E
oklch(49.1% 0.051 262.1)
-
Step 800
800 (this color)
#424F66
oklch(42.6% 0.042 261.7)
-
Step 900
900
#384253
oklch(37.7% 0.032 261)
-
Step 950
950
#212731
oklch(27.1% 0.021 260.6)
#424F66 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) | #475067 | 0.008 |
| Deuteranopia (no green cones) | #444D65 | 0.006 |
| Tritanopia (no blue cones) | #375457 | 0.037 |
| Achromatopsia (no color) | #4E4E4E | 0.042 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #424F66
#424F66
oklch(42.6% 0.042 261.7)
- #5A4D34
#5A4D34
oklch(42.7% 0.042 83.3)
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 #424F66, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- YInMn Blue #415A77 ΔE 0.038
- Dusty Grape #545775 ΔE 0.043
- Dark Grey Blue #29465B ΔE 0.049
- Dark Slate Gray #2F4F4F ΔE 0.049
- Dusk #4E5481 ΔE 0.049
- Charcoal #264653 ΔE 0.057
- Light Navy Blue #2E5A88 ΔE 0.059
- Deep Teal #00555A ΔE 0.063
Use #424F66 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.