#42739F
Closest named color: Muted Blue (#3B719F). oklch(54% 0.087 247.3), rgb(66, 115, 159).
Aa
White text reads best on this color (5.01:1).
About this color
#42739F is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.087 and its hue 247°. Its hue sits on the cool side of the wheel. The nearest named color is Muted Blue (#3B719F), ΔE 0.010 away. White text reads best on it, at 5.01:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.087) |
| Temperature | cool |
| Nearest name | Muted Blue (#3B719F) |
| Black text | 4.18:1 |
| White text | 5.01:1 |
Values
| HEX | #42739F |
| RGB | rgb(66, 115, 159) |
| HSL | hsl(208, 41%, 44%) |
| OKLCH | oklch(54% 0.087 247.3) |
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 #42739F | 5.01:1 | AA | Lc -79.9 | Fine for body text |
| Black text on #42739F | 4.18:1 | AA large text | Lc 29.5 | Dividers and decoration only |
| #42739F text on white | 5.01:1 | AA | Lc 74.5 | Content text, not long reading |
| #42739F text on black | 4.18:1 | AA large text | Lc -27.2 | 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
#ADC4D9
oklch(81% 0.039 245.9)
-
Step 400
400
#81A5C6
oklch(70.7% 0.063 246.5)
-
Step 500
500
#618EB8
oklch(63.1% 0.08 247.5)
-
Step 600
600 (this color)
#42739F
oklch(54% 0.087 247.3)
-
Step 700
700
#38648C
oklch(49% 0.081 247.6)
-
Step 800
800
#2F5272
oklch(42.7% 0.067 247.6)
-
Step 900
900
#2A445C
oklch(37.7% 0.052 247.5)
-
Step 950
950
#192836
oklch(27% 0.033 247.4)
#42739F 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) | #6074A1 | 0.036 |
| Deuteranopia (no green cones) | #546B9E | 0.028 |
| Tritanopia (no blue cones) | #007D82 | 0.072 |
| Achromatopsia (no color) | #6F6F6F | 0.088 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42739F
#42739F
oklch(54% 0.087 247.3)
- #916432
#916432
oklch(54% 0.088 66.9)
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 #42739F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Muted Blue #3B719F ΔE 0.010
- Dull Blue #49759C ΔE 0.011
- Flat Blue #3C73A8 ΔE 0.015
- Cerulean #457B9D ΔE 0.025
- Metallic Blue #4F738E ΔE 0.029
- Stormy Blue #507B9C ΔE 0.031
- French Blue #436BAD ΔE 0.036
- Nice Blue #107AB0 ΔE 0.037
Use #42739F 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.