#42599B
Closest named color: Denim Blue (#3B5B92). oklch(47.8% 0.11 267.7), rgb(66, 89, 155).
Aa
White text reads best on this color (6.70:1).
About this color
#42599B is a medium-dark, moderately saturated blue. In OKLCH its lightness is 48%, its chroma 0.110 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Denim Blue (#3B5B92), ΔE 0.019 away. White text reads best on it, at 6.70:1.
| Hue family | Blues |
| Lightness | medium-dark (48%) |
| Chroma | moderately saturated (0.110) |
| Temperature | cool |
| Nearest name | Denim Blue (#3B5B92) |
| Black text | 3.13:1 |
| White text | 6.70:1 |
Values
| HEX | #42599B |
| RGB | rgb(66, 89, 155) |
| HSL | hsl(224, 40%, 43%) |
| OKLCH | oklch(47.8% 0.11 267.7) |
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 #42599B | 6.70:1 | AA | Lc -87.9 | Fine for body text |
| Black text on #42599B | 3.13:1 | AA large text | Lc 21.1 | Dividers and decoration only |
| #42599B text on white | 6.70:1 | AA | Lc 82.9 | Fine for body text |
| #42599B text on black | 3.13:1 | AA large text | Lc -19.0 | Dividers and decoration only |
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 700.
-
Step 50
50
#F3F5FA
oklch(97% 0.007 268.5)
-
Step 100
100
#E5EAF5
oklch(93.6% 0.016 266.3)
-
Step 200
200
#D0D9ED
oklch(88.5% 0.029 266.4)
-
Step 300
300
#B1C0E4
oklch(80.8% 0.054 267.4)
-
Step 400
400
#899FD7
oklch(70.7% 0.086 267.6)
-
Step 500
500
#6D86CC
oklch(63.1% 0.11 268.2)
-
Step 600
600
#556FB9
oklch(55.6% 0.119 267.8)
-
Step 700
700 (this color)
#42599B
oklch(47.8% 0.11 267.7)
-
Step 800
800
#394C81
oklch(42.7% 0.091 267.6)
-
Step 900
900
#314067
oklch(37.8% 0.07 267.1)
-
Step 950
950
#1D253D
oklch(26.9% 0.046 269.1)
#42599B 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) | #3D609E | 0.019 |
| Deuteranopia (no green cones) | #31589A | 0.020 |
| Tritanopia (no blue cones) | #076872 | 0.100 |
| Achromatopsia (no color) | #5C5C5C | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42599B
#42599B
oklch(47.8% 0.11 267.7)
- #745900
#745900
oklch(47.8% 0.098 88.1)
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 #42599B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim Blue #3B5B92 ΔE 0.019
- Dusky Blue #475F94 ΔE 0.024
- Twilight #4E518B ΔE 0.033
- Light Navy Blue #2E5A88 ΔE 0.040
- Denim #3B638C ΔE 0.042
- Dusk Blue #26538D ΔE 0.043
- Dusk #4E5481 ΔE 0.043
- French Blue #436BAD ΔE 0.054
Use #42599B 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.