#42688F
Closest named color: Denim (#3B638C). oklch(50.6% 0.076 250.1), rgb(66, 104, 143).
Aa
White text reads best on this color (5.81:1).
About this color
#42688F is a medium-dark, moderately saturated blue. In OKLCH its lightness is 51%, its chroma 0.076 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Denim (#3B638C), ΔE 0.018 away. White text reads best on it, at 5.81:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.076) |
| Temperature | cool |
| Nearest name | Denim (#3B638C) |
| Black text | 3.60:1 |
| White text | 5.81:1 |
Values
| HEX | #42688F |
| RGB | rgb(66, 104, 143) |
| HSL | hsl(210, 37%, 41%) |
| OKLCH | oklch(50.6% 0.076 250.1) |
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 #42688F | 5.81:1 | AA | Lc -84.2 | Fine for body text |
| Black text on #42688F | 3.60:1 | AA large text | Lc 25.1 | Dividers and decoration only |
| #42688F text on white | 5.81:1 | AA | Lc 79.0 | Fine for body text |
| #42688F text on black | 3.60:1 | AA large text | Lc -22.8 | 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
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E5EBF1
oklch(93.7% 0.01 247.9)
-
Step 200
200
#CFDAE6
oklch(88.4% 0.02 250.4)
-
Step 300
300
#AFC3D8
oklch(80.9% 0.037 249.6)
-
Step 400
400
#85A4C5
oklch(70.7% 0.059 250.3)
-
Step 500
500
#668DB6
oklch(63.1% 0.076 250.3)
-
Step 600
600
#4D77A2
oklch(55.7% 0.082 250)
-
Step 700
700 (this color)
#42688F
oklch(50.6% 0.076 250.1)
-
Step 800
800
#335170
oklch(42.6% 0.063 250.3)
-
Step 900
900
#2D445B
oklch(37.8% 0.049 249.2)
-
Step 950
950
#1B2835
oklch(27.1% 0.03 249)
#42688F 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) | #586991 | 0.028 |
| Deuteranopia (no green cones) | #4E628E | 0.021 |
| Tritanopia (no blue cones) | #177175 | 0.067 |
| Achromatopsia (no color) | #656565 | 0.076 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42688F
#42688F
oklch(50.6% 0.076 250.1)
- #815D31
#815D31
oklch(50.6% 0.076 70.1)
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 #42688F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim #3B638C ΔE 0.018
- Dusky Blue #475F94 ΔE 0.030
- Muted Blue #3B719F ΔE 0.032
- Metallic Blue #4F738E ΔE 0.039
- Peacock Blue #016795 ΔE 0.041
- Dull Blue #49759C ΔE 0.041
- Ocean Blue #03719C ΔE 0.042
- Denim Blue #3B5B92 ΔE 0.042
Use #42688F 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.