#40739D
Closest named color: Muted Blue (#3B719F). oklch(53.8% 0.086 245.2), rgb(64, 115, 157).
Aa
White text reads best on this color (5.05:1).
About this color
#40739D is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.086 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Muted Blue (#3B719F), ΔE 0.009 away. White text reads best on it, at 5.05:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.086) |
| Temperature | cool |
| Nearest name | Muted Blue (#3B719F) |
| Black text | 4.15:1 |
| White text | 5.05:1 |
Values
| HEX | #40739D |
| RGB | rgb(64, 115, 157) |
| HSL | hsl(207, 42%, 43%) |
| OKLCH | oklch(53.8% 0.086 245.2) |
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 #40739D | 5.05:1 | AA | Lc -80.1 | Fine for body text |
| Black text on #40739D | 4.15:1 | AA large text | Lc 29.3 | Dividers and decoration only |
| #40739D text on white | 5.05:1 | AA | Lc 74.7 | Content text, not long reading |
| #40739D text on black | 4.15:1 | AA large text | Lc -27.0 | 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 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
#80A5C5
oklch(70.6% 0.062 244.9)
-
Step 500
500
#608FB7
oklch(63.2% 0.079 245.2)
-
Step 600
600 (this color)
#40739D
oklch(53.8% 0.086 245.2)
-
Step 700
700
#36658B
oklch(49.1% 0.08 244.9)
-
Step 800
800
#2E5371
oklch(42.8% 0.066 244.7)
-
Step 900
900
#29445B
oklch(37.6% 0.052 245.5)
-
Step 950
950
#192835
oklch(27% 0.032 245.5)
#40739D 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 | 0.039 |
| Deuteranopia (no green cones) | #546B9C | 0.030 |
| Tritanopia (no blue cones) | #007D81 | 0.070 |
| Achromatopsia (no color) | #6F6F6F | 0.086 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40739D
#40739D
oklch(53.8% 0.086 245.2)
- #906334
#906334
oklch(53.7% 0.086 65.4)
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 #40739D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Muted Blue #3B719F ΔE 0.009
- Dull Blue #49759C ΔE 0.012
- Flat Blue #3C73A8 ΔE 0.018
- Cerulean #457B9D ΔE 0.025
- Metallic Blue #4F738E ΔE 0.027
- Stormy Blue #507B9C ΔE 0.031
- Ocean Blue #03719C ΔE 0.035
- Sea Blue #047495 ΔE 0.037
Use #40739D 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.