#40537A
Closest named color: YInMn Blue (#415A77). oklch(44.4% 0.069 263.9), rgb(64, 83, 122).
Aa
White text reads best on this color (7.67:1).
About this color
#40537A is a dark, muted blue. In OKLCH its lightness is 44%, its chroma 0.069 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is YInMn Blue (#415A77), ΔE 0.024 away. White text reads best on it, at 7.67:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | muted (0.069) |
| Temperature | cool |
| Nearest name | YInMn Blue (#415A77) |
| Black text | 2.73:1 |
| White text | 7.67:1 |
Values
| HEX | #40537A |
| RGB | rgb(64, 83, 122) |
| HSL | hsl(220, 31%, 36%) |
| OKLCH | oklch(44.4% 0.069 263.9) |
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 #40537A | 7.67:1 | AAA | Lc -91.4 | Preferred for body text |
| Black text on #40537A | 2.73:1 | Fails | Lc 17.4 | Dividers and decoration only |
| #40537A text on white | 7.67:1 | AAA | Lc 86.6 | Fine for body text |
| #40537A text on black | 2.73:1 | Fails | Lc -15.5 | 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 800.
-
Step 50
50
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E6EAF2
oklch(93.6% 0.012 264.5)
-
Step 200
200
#D2D9E8
oklch(88.4% 0.022 265.8)
-
Step 300
300
#B3C1DB
oklch(80.9% 0.04 262.9)
-
Step 400
400
#8CA1CA
oklch(70.8% 0.065 263.6)
-
Step 500
500
#7089BC
oklch(63.1% 0.083 264)
-
Step 600
600
#5872A8
oklch(55.5% 0.09 264.1)
-
Step 700
700
#486090
oklch(49.1% 0.083 263.4)
-
Step 800
800 (this color)
#40537A
oklch(44.4% 0.069 263.9)
-
Step 900
900
#33415E
oklch(37.6% 0.053 264.2)
-
Step 950
950
#1E2637
oklch(26.9% 0.034 264.8)
#40537A 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) | #45567C | 0.012 |
| Deuteranopia (no green cones) | #3E5179 | 0.007 |
| Tritanopia (no blue cones) | #2A5B61 | 0.061 |
| Achromatopsia (no color) | #535353 | 0.069 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40537A
#40537A
oklch(44.4% 0.069 263.9)
- #665023
#665023
oklch(44.4% 0.069 83.2)
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 #40537A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- YInMn Blue #415A77 ΔE 0.024
- Dusk #4E5481 ΔE 0.024
- Light Navy Blue #2E5A88 ΔE 0.031
- Dusty Grape #545775 ΔE 0.034
- Twilight #4E518B ΔE 0.037
- Dusk Blue #26538D ΔE 0.041
- Denim Blue #3B5B92 ΔE 0.041
- Light Navy #155084 ΔE 0.047
Use #40537A 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.