#40739A
Closest named color: Dull Blue (#49759C). oklch(53.7% 0.083 243.3), rgb(64, 115, 154).
Aa
White text reads best on this color (5.07:1).
About this color
#40739A is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.083 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Dull Blue (#49759C), ΔE 0.012 away. White text reads best on it, at 5.07:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.083) |
| Temperature | cool |
| Nearest name | Dull Blue (#49759C) |
| Black text | 4.13:1 |
| White text | 5.07:1 |
Values
| HEX | #40739A |
| RGB | rgb(64, 115, 154) |
| HSL | hsl(206, 41%, 43%) |
| OKLCH | oklch(53.7% 0.083 243.3) |
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 #40739A | 5.07:1 | AA | Lc -80.3 | Fine for body text |
| Black text on #40739A | 4.13:1 | AA large text | Lc 29.2 | Dividers and decoration only |
| #40739A text on white | 5.07:1 | AA | Lc 74.9 | Content text, not long reading |
| #40739A text on black | 4.13:1 | AA large text | Lc -26.8 | 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 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
#CEDBE6
oklch(88.5% 0.021 243.4)
-
Step 300
300
#ADC4D7
oklch(80.9% 0.037 243.1)
-
Step 400
400
#81A5C3
oklch(70.6% 0.059 243.9)
-
Step 500
500
#608FB4
oklch(63.1% 0.076 243.1)
-
Step 600
600 (this color)
#40739A
oklch(53.7% 0.083 243.3)
-
Step 700
700
#376589
oklch(49% 0.077 243.9)
-
Step 800
800
#2E536F
oklch(42.7% 0.063 242.8)
-
Step 900
900
#29455A
oklch(37.8% 0.05 242.1)
-
Step 950
950
#192835
oklch(27% 0.032 245.5)
#40739A 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) | #62739C | 0.040 |
| Deuteranopia (no green cones) | #566A99 | 0.033 |
| Tritanopia (no blue cones) | #007C80 | 0.066 |
| Achromatopsia (no color) | #6E6E6E | 0.083 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40739A
#40739A
oklch(53.7% 0.083 243.3)
- #906338
#906338
oklch(53.8% 0.083 63.2)
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 #40739A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dull Blue #49759C ΔE 0.012
- Muted Blue #3B719F ΔE 0.012
- Flat Blue #3C73A8 ΔE 0.022
- Metallic Blue #4F738E ΔE 0.024
- Cerulean #457B9D ΔE 0.025
- Stormy Blue #507B9C ΔE 0.031
- Sea Blue #047495 ΔE 0.035
- Ocean Blue #03719C ΔE 0.035
Use #40739A 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.