#37647B
Closest named color: Denim (#3B638C). oklch(48.1% 0.062 232.3), rgb(55, 100, 123).
Aa
White text reads best on this color (6.41:1).
About this color
#37647B is a medium-dark, muted blue. In OKLCH its lightness is 48%, its chroma 0.062 and its hue 232°. Its hue sits on the cool side of the wheel. The nearest named color is Denim (#3B638C), ΔE 0.030 away. White text reads best on it, at 6.41:1.
| Hue family | Blues |
| Lightness | medium-dark (48%) |
| Chroma | muted (0.062) |
| Temperature | cool |
| Nearest name | Denim (#3B638C) |
| Black text | 3.27:1 |
| White text | 6.41:1 |
Values
| HEX | #37647B |
| RGB | rgb(55, 100, 123) |
| HSL | hsl(200, 38%, 35%) |
| OKLCH | oklch(48.1% 0.062 232.3) |
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 #37647B | 6.41:1 | AA | Lc -86.9 | Fine for body text |
| Black text on #37647B | 3.27:1 | AA large text | Lc 22.3 | Dividers and decoration only |
| #37647B text on white | 6.41:1 | AA | Lc 81.8 | Fine for body text |
| #37647B text on black | 3.27:1 | AA large text | Lc -20.1 | 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
#E4EBEF
oklch(93.6% 0.009 232.4)
-
Step 200
200
#CFDBE2
oklch(88.4% 0.016 233)
-
Step 300
300
#AEC4D1
oklch(80.8% 0.03 233.7)
-
Step 400
400
#83A6BA
oklch(70.6% 0.048 233.4)
-
Step 500
500
#6390A9
oklch(63% 0.062 233.4)
-
Step 600
600
#497A94
oklch(55.5% 0.067 232.9)
-
Step 700
700 (this color)
#37647B
oklch(48.1% 0.062 232.3)
-
Step 800
800
#305466
oklch(42.7% 0.051 231.4)
-
Step 900
900
#2B4553
oklch(37.6% 0.04 232.8)
-
Step 950
950
#1A2931
oklch(27.1% 0.025 232.2)
#37647B 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) | #59637C | 0.042 |
| Deuteranopia (no green cones) | #4F5B7B | 0.037 |
| Tritanopia (no blue cones) | #096A6B | 0.047 |
| Achromatopsia (no color) | #5F5F5F | 0.062 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37647B
#37647B
oklch(48.1% 0.062 232.3)
- #7A543D
#7A543D
oklch(48.1% 0.062 51.9)
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 #37647B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim #3B638C ΔE 0.030
- YInMn Blue #415A77 ΔE 0.030
- Slate #516572 ΔE 0.034
- Light Navy Blue #2E5A88 ΔE 0.043
- Dark Aqua #05696B ΔE 0.046
- Peacock Blue #016795 ΔE 0.047
- Dusty Grape #545775 ΔE 0.048
- Petrol #005F6A ΔE 0.048
Use #37647B 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.