#40637C
Closest named color: Denim (#3B638C). oklch(48.4% 0.057 240.5), rgb(64, 99, 124).
Aa
White text reads best on this color (6.37:1).
About this color
#40637C is a medium-dark, muted blue. In OKLCH its lightness is 48%, its chroma 0.057 and its hue 241°. Its hue sits on the cool side of the wheel. The nearest named color is Denim (#3B638C), ΔE 0.026 away. White text reads best on it, at 6.37:1.
| Hue family | Blues |
| Lightness | medium-dark (48%) |
| Chroma | muted (0.057) |
| Temperature | cool |
| Nearest name | Denim (#3B638C) |
| Black text | 3.29:1 |
| White text | 6.37:1 |
Values
| HEX | #40637C |
| RGB | rgb(64, 99, 124) |
| HSL | hsl(205, 32%, 37%) |
| OKLCH | oklch(48.4% 0.057 240.5) |
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 #40637C | 6.37:1 | AA | Lc -86.7 | Fine for body text |
| Black text on #40637C | 3.29:1 | AA large text | Lc 22.4 | Dividers and decoration only |
| #40637C text on white | 6.37:1 | AA | Lc 81.6 | Fine for body text |
| #40637C text on black | 3.29:1 | AA large text | Lc -20.3 | 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 700.
-
Step 50
50
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E5EBEF
oklch(93.7% 0.008 236.6)
-
Step 200
200
#D1DBE2
oklch(88.6% 0.015 238)
-
Step 300
300
#B1C3D1
oklch(80.8% 0.028 241.2)
-
Step 400
400
#88A5BA
oklch(70.7% 0.045 239.7)
-
Step 500
500
#6A8EA9
oklch(63% 0.057 241.2)
-
Step 600
600
#527894
oklch(55.5% 0.061 241.1)
-
Step 700
700 (this color)
#40637C
oklch(48.4% 0.057 240.5)
-
Step 800
800
#375367
oklch(42.9% 0.047 240.3)
-
Step 900
900
#304453
oklch(37.6% 0.036 241.3)
-
Step 950
950
#1C2831
oklch(27% 0.024 241.1)
#40637C 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) | #58637D | 0.031 |
| Deuteranopia (no green cones) | #505C7C | 0.028 |
| Tritanopia (no blue cones) | #25696B | 0.046 |
| Achromatopsia (no color) | #5F5F5F | 0.057 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40637C
#40637C
oklch(48.4% 0.057 240.5)
- #77573D
#77573D
oklch(48.4% 0.057 59.9)
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 #40637C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim #3B638C ΔE 0.026
- YInMn Blue #415A77 ΔE 0.027
- Slate #516572 ΔE 0.028
- Dusty Grape #545775 ΔE 0.040
- Light Navy Blue #2E5A88 ΔE 0.043
- Dusky Blue #475F94 ΔE 0.045
- Denim Blue #3B5B92 ΔE 0.049
- Dusk #4E5481 ΔE 0.050
Use #40637C 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.