#42455A
Closest named color: Dark Grey Blue (#29465B). oklch(39.6% 0.036 278.3), rgb(66, 69, 90).
Aa
White text reads best on this color (9.41:1).
About this color
#42455A is a dark, muted blue. In OKLCH its lightness is 40%, its chroma 0.036 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.034 away. White text reads best on it, at 9.41:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | muted (0.036) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.23:1 |
| White text | 9.41:1 |
Values
| HEX | #42455A |
| RGB | rgb(66, 69, 90) |
| HSL | hsl(233, 15%, 31%) |
| OKLCH | oklch(39.6% 0.036 278.3) |
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 #42455A | 9.41:1 | AAA | Lc -96.1 | Preferred for body text |
| Black text on #42455A | 2.23:1 | Fails | Lc 12.2 | Not readable |
| #42455A text on white | 9.41:1 | AAA | Lc 91.8 | Preferred for body text |
| #42455A text on black | 2.23:1 | Fails | Lc -10.6 | 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 900.
-
Step 50
50
#F5F5F8
oklch(97.1% 0.004 286.3)
-
Step 100
100
#E8E9EF
oklch(93.5% 0.008 278.6)
-
Step 200
200
#D6D8E3
oklch(88.4% 0.015 277.8)
-
Step 300
300
#BCBFD2
oklch(80.8% 0.027 278.6)
-
Step 400
400
#9A9EBC
oklch(70.6% 0.044 279.2)
-
Step 500
500
#8187AB
oklch(63.2% 0.055 277.3)
-
Step 600
600
#6B7096
oklch(55.6% 0.059 278.5)
-
Step 700
700
#595E80
oklch(49.1% 0.055 277.7)
-
Step 800
800
#494D68
oklch(42.8% 0.045 277.8)
-
Step 900
900 (this color)
#42455A
oklch(39.6% 0.036 278.3)
-
Step 950
950
#242532
oklch(26.9% 0.024 281.2)
#42455A 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) | #3F475B | 0.007 |
| Deuteranopia (no green cones) | #3E4559 | 0.007 |
| Tritanopia (no blue cones) | #3C494C | 0.032 |
| Achromatopsia (no color) | #464646 | 0.036 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42455A
#42455A
oklch(39.6% 0.036 278.3)
- #4C4731
#4C4731
oklch(39.7% 0.035 96.9)
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 #42455A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.034
- Charcoal #264653 ΔE 0.041
- Charcoal Grey #3C4142 ΔE 0.042
- Dark Slate Gray #2F4F4F ΔE 0.049
- Onyx #343A40 ΔE 0.057
- Dark Blue Grey #1F3B4D ΔE 0.065
- YInMn Blue #415A77 ΔE 0.070
- Dark Teal #014D4E ΔE 0.071
Use #42455A 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.