#42457E
Closest named color: Dark Slate Blue (#483D8B). oklch(41.6% 0.094 279.2), rgb(66, 69, 126).
Aa
White text reads best on this color (8.80:1).
About this color
#42457E is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.094 and its hue 279°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.033 away. White text reads best on it, at 8.80:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.094) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.38:1 |
| White text | 8.80:1 |
Values
| HEX | #42457E |
| RGB | rgb(66, 69, 126) |
| HSL | hsl(237, 31%, 38%) |
| OKLCH | oklch(41.6% 0.094 279.2) |
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 #42457E | 8.80:1 | AAA | Lc -94.5 | Preferred for body text |
| Black text on #42457E | 2.38:1 | Fails | Lc 14.0 | Not readable |
| #42457E text on white | 8.80:1 | AAA | Lc 90.0 | Preferred for body text |
| #42457E text on black | 2.38:1 | Fails | Lc -12.3 | 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
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E7E9F5
oklch(93.6% 0.016 278.5)
-
Step 200
200
#D4D8EE
oklch(88.6% 0.03 277.6)
-
Step 300
300
#B8BEE4
oklch(80.9% 0.054 278.1)
-
Step 400
400
#959BD7
oklch(70.7% 0.088 279.5)
-
Step 500
500
#7B81CC
oklch(63% 0.112 279.2)
-
Step 600
600
#656AB9
oklch(55.7% 0.121 278.9)
-
Step 700
700
#54589F
oklch(49.1% 0.112 279)
-
Step 800
800 (this color)
#42457E
oklch(41.6% 0.094 279.2)
-
Step 900
900
#3A3D68
oklch(37.8% 0.073 279.3)
-
Step 950
950
#22243D
oklch(27.1% 0.046 279.3)
#42457E 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) | #2F4D80 | 0.031 |
| Deuteranopia (no green cones) | #2B487D | 0.031 |
| Tritanopia (no blue cones) | #2D515B | 0.083 |
| Achromatopsia (no color) | #4A4A4A | 0.094 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42457E
#42457E
oklch(41.6% 0.094 279.2)
- #584C00
#584C00
oklch(41.6% 0.086 98.8)
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 #42457E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.033
- Blueberry #464196 ΔE 0.043
- Twilight #4E518B ΔE 0.043
- Cobalt #1E488F ΔE 0.049
- Dusk #4E5481 ΔE 0.049
- Dusk Blue #26538D ΔE 0.050
- Light Navy #155084 ΔE 0.052
- Twilight Blue #0A437A ΔE 0.060
Use #42457E 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.