#40508B
Closest named color: Twilight (#4E518B). oklch(44.7% 0.099 270.6), rgb(64, 80, 139).
Aa
White text reads best on this color (7.66:1).
About this color
#40508B is a dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.099 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.021 away. White text reads best on it, at 7.66:1.
| Hue family | Blues |
| Lightness | dark (45%) |
| Chroma | moderately saturated (0.099) |
| Temperature | cool |
| Nearest name | Twilight (#4E518B) |
| Black text | 2.73:1 |
| White text | 7.66:1 |
Values
| HEX | #40508B |
| RGB | rgb(64, 80, 139) |
| HSL | hsl(227, 37%, 40%) |
| OKLCH | oklch(44.7% 0.099 270.6) |
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 #40508B | 7.66:1 | AAA | Lc -91.3 | Preferred for body text |
| Black text on #40508B | 2.73:1 | Fails | Lc 17.5 | Dividers and decoration only |
| #40508B text on white | 7.66:1 | AAA | Lc 86.5 | Fine for body text |
| #40508B text on black | 2.73:1 | Fails | Lc -15.6 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E5EAF5
oklch(93.6% 0.016 266.3)
-
Step 200
200
#D1D9EF
oklch(88.6% 0.031 269.8)
-
Step 300
300
#B2BFE7
oklch(80.8% 0.058 270.9)
-
Step 400
400
#8B9EDB
oklch(70.8% 0.092 270.6)
-
Step 500
500
#6F85D1
oklch(63.2% 0.117 270.5)
-
Step 600
600
#576DBE
oklch(55.6% 0.128 270.4)
-
Step 700
700
#485BA4
oklch(49.2% 0.119 270.6)
-
Step 800
800 (this color)
#40508B
oklch(44.7% 0.099 270.6)
-
Step 900
900
#323E6A
oklch(37.6% 0.077 270.8)
-
Step 950
950
#1D253E
oklch(27% 0.048 269.5)
#40508B 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) | #38578D | 0.021 |
| Deuteranopia (no green cones) | #30508A | 0.020 |
| Tritanopia (no blue cones) | #1D5D66 | 0.089 |
| Achromatopsia (no color) | #535353 | 0.099 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40508B
#40508B
oklch(44.7% 0.099 270.6)
- #685200
#685200
oklch(44.8% 0.092 90.8)
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 #40508B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.021
- Dusk Blue #26538D ΔE 0.028
- Dusk #4E5481 ΔE 0.030
- Denim Blue #3B5B92 ΔE 0.031
- Light Navy Blue #2E5A88 ΔE 0.035
- Light Navy #155084 ΔE 0.045
- Dusky Blue #475F94 ΔE 0.045
- Blueberry #464196 ΔE 0.047
Use #40508B 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.