#424588
Closest named color: Dark Slate Blue (#483D8B). oklch(42.3% 0.109 278.7), rgb(66, 69, 136).
Aa
White text reads best on this color (8.61:1).
About this color
#424588 is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.109 and its hue 279°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.023 away. White text reads best on it, at 8.61:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.109) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.43:1 |
| White text | 8.61:1 |
Values
| HEX | #424588 |
| RGB | rgb(66, 69, 136) |
| HSL | hsl(237, 35%, 40%) |
| OKLCH | oklch(42.3% 0.109 278.7) |
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 #424588 | 8.61:1 | AAA | Lc -93.9 | Preferred for body text |
| Black text on #424588 | 2.43:1 | Fails | Lc 14.6 | Not readable |
| #424588 text on white | 8.61:1 | AAA | Lc 89.4 | Fine for body text |
| #424588 text on black | 2.43:1 | Fails | Lc -12.8 | 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
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E7E9F6
oklch(93.6% 0.018 279.1)
-
Step 200
200
#D3D7F1
oklch(88.4% 0.036 278.7)
-
Step 300
300
#B7BDEA
oklch(80.9% 0.064 278.9)
-
Step 400
400
#929AE0
oklch(70.7% 0.103 278.4)
-
Step 500
500
#797FD7
oklch(63% 0.131 279)
-
Step 600
600
#6367C4
oklch(55.6% 0.142 278.9)
-
Step 700
700
#5255A9
oklch(49% 0.132 278.8)
-
Step 800
800 (this color)
#424588
oklch(42.3% 0.109 278.7)
-
Step 900
900
#383B6E
oklch(37.6% 0.086 278.8)
-
Step 950
950
#212340
oklch(27% 0.054 279.2)
#424588 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) | #274F8A | 0.039 |
| Deuteranopia (no green cones) | #214987 | 0.040 |
| Tritanopia (no blue cones) | #265360 | 0.094 |
| Achromatopsia (no color) | #4C4C4C | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #424588
#424588
oklch(42.3% 0.109 278.7)
- #5A4E00
#5A4E00
oklch(42.3% 0.088 99.1)
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 #424588, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.023
- Blueberry #464196 ΔE 0.027
- Twilight #4E518B ΔE 0.040
- Cobalt #1E488F ΔE 0.043
- Dusk Blue #26538D ΔE 0.047
- Dusk #4E5481 ΔE 0.052
- Light Navy #155084 ΔE 0.054
- Denim Blue #3B5B92 ΔE 0.061
Use #424588 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.