#42455D
Closest named color: Dark Grey Blue (#29465B). oklch(39.8% 0.041 278.8), rgb(66, 69, 93).
Aa
White text reads best on this color (9.37:1).
About this color
#42455D is a dark, muted blue. In OKLCH its lightness is 40%, its chroma 0.041 and its hue 279°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.035 away. White text reads best on it, at 9.37:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | muted (0.041) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.24:1 |
| White text | 9.37:1 |
Values
| HEX | #42455D |
| RGB | rgb(66, 69, 93) |
| HSL | hsl(233, 17%, 31%) |
| OKLCH | oklch(39.8% 0.041 278.8) |
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 #42455D | 9.37:1 | AAA | Lc -95.9 | Preferred for body text |
| Black text on #42455D | 2.24:1 | Fails | Lc 12.3 | Not readable |
| #42455D text on white | 9.37:1 | AAA | Lc 91.7 | Preferred for body text |
| #42455D text on black | 2.24:1 | Fails | Lc -10.7 | 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 900.
-
Step 50
50
#F5F5F8
oklch(97.1% 0.004 286.3)
-
Step 100
100
#E8E9F0
oklch(93.5% 0.009 279.7)
-
Step 200
200
#D6D8E5
oklch(88.5% 0.018 279)
-
Step 300
300
#BCBFD5
oklch(80.9% 0.031 279.5)
-
Step 400
400
#999EBF
oklch(70.7% 0.048 278.3)
-
Step 500
500
#8186AF
oklch(63.1% 0.062 279.1)
-
Step 600
600
#6A6F9B
oklch(55.5% 0.069 278.9)
-
Step 700
700
#595D84
oklch(49.1% 0.063 279.3)
-
Step 800
800
#484C6B
oklch(42.6% 0.052 278.3)
-
Step 900
900 (this color)
#42455D
oklch(39.8% 0.041 278.8)
-
Step 950
950
#232533
oklch(26.9% 0.026 278.2)
#42455D 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) | #3E475E | 0.008 |
| Deuteranopia (no green cones) | #3D465C | 0.008 |
| Tritanopia (no blue cones) | #3B494D | 0.036 |
| Achromatopsia (no color) | #464646 | 0.041 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42455D
#42455D
oklch(39.8% 0.041 278.8)
- #4C482E
#4C482E
oklch(39.8% 0.041 100.5)
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 #42455D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.035
- Charcoal #264653 ΔE 0.044
- Charcoal Grey #3C4142 ΔE 0.047
- Dark Slate Gray #2F4F4F ΔE 0.052
- Onyx #343A40 ΔE 0.061
- Dark Blue Grey #1F3B4D ΔE 0.066
- YInMn Blue #415A77 ΔE 0.068
- Dusty Grape #545775 ΔE 0.069
Use #42455D 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.