#42739D
Closest named color: Dull Blue (#49759C). oklch(53.9% 0.085 246.1), rgb(66, 115, 157).
Aa
White text reads best on this color (5.03:1).
About this color
#42739D is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.085 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Dull Blue (#49759C), ΔE 0.010 away. White text reads best on it, at 5.03:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.085) |
| Temperature | cool |
| Nearest name | Dull Blue (#49759C) |
| Black text | 4.17:1 |
| White text | 5.03:1 |
Values
| HEX | #42739D |
| RGB | rgb(66, 115, 157) |
| HSL | hsl(208, 41%, 44%) |
| OKLCH | oklch(53.9% 0.085 246.1) |
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 #42739D | 5.03:1 | AA | Lc -80.0 | Fine for body text |
| Black text on #42739D | 4.17:1 | AA large text | Lc 29.4 | Dividers and decoration only |
| #42739D text on white | 5.03:1 | AA | Lc 74.6 | Content text, not long reading |
| #42739D text on black | 4.17:1 | AA large text | Lc -27.1 | 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 600.
-
Step 50
50
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E4EBF1
oklch(93.6% 0.011 243.7)
-
Step 200
200
#CEDBE7
oklch(88.5% 0.022 245.9)
-
Step 300
300
#ADC4D8
oklch(80.9% 0.038 244.5)
-
Step 400
400
#81A5C5
oklch(70.7% 0.061 245.6)
-
Step 500
500
#618EB6
oklch(63% 0.078 246.3)
-
Step 600
600 (this color)
#42739D
oklch(53.9% 0.085 246.1)
-
Step 700
700
#38658B
oklch(49.2% 0.079 245.8)
-
Step 800
800
#2F5271
oklch(42.6% 0.066 246.8)
-
Step 900
900
#2A445B
oklch(37.6% 0.051 246.3)
-
Step 950
950
#192835
oklch(27% 0.032 245.5)
#42739D 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) | #61749F | 0.037 |
| Deuteranopia (no green cones) | #556B9C | 0.029 |
| Tritanopia (no blue cones) | #007D81 | 0.071 |
| Achromatopsia (no color) | #6F6F6F | 0.085 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42739D
#42739D
oklch(53.9% 0.085 246.1)
- #906435
#906435
oklch(54% 0.085 66.1)
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 #42739D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dull Blue #49759C ΔE 0.010
- Muted Blue #3B719F ΔE 0.010
- Flat Blue #3C73A8 ΔE 0.018
- Cerulean #457B9D ΔE 0.025
- Metallic Blue #4F738E ΔE 0.027
- Stormy Blue #507B9C ΔE 0.030
- Ocean Blue #03719C ΔE 0.037
- French Blue #436BAD ΔE 0.038
Use #42739D 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.