#37637B
Closest named color: YInMn Blue (#415A77). oklch(47.8% 0.062 234), rgb(55, 99, 123).
Aa
White text reads best on this color (6.49:1).
About this color
#37637B is a medium-dark, muted blue. In OKLCH its lightness is 48%, its chroma 0.062 and its hue 234°. Its hue sits on the cool side of the wheel. The nearest named color is YInMn Blue (#415A77), ΔE 0.027 away. White text reads best on it, at 6.49:1.
| Hue family | Blues |
| Lightness | medium-dark (48%) |
| Chroma | muted (0.062) |
| Temperature | cool |
| Nearest name | YInMn Blue (#415A77) |
| Black text | 3.23:1 |
| White text | 6.49:1 |
Values
| HEX | #37637B |
| RGB | rgb(55, 99, 123) |
| HSL | hsl(201, 38%, 35%) |
| OKLCH | oklch(47.8% 0.062 234) |
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 #37637B | 6.49:1 | AA | Lc -87.2 | Fine for body text |
| Black text on #37637B | 3.23:1 | AA large text | Lc 22.0 | Dividers and decoration only |
| #37637B text on white | 6.49:1 | AA | Lc 82.1 | Fine for body text |
| #37637B text on black | 3.23:1 | AA large text | Lc -19.8 | 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
#CFDBE3
oklch(88.5% 0.017 236.7)
-
Step 300
300
#AEC4D1
oklch(80.8% 0.03 233.7)
-
Step 400
400
#84A6BA
oklch(70.7% 0.047 234.1)
-
Step 500
500
#6490A9
oklch(63.1% 0.061 233.9)
-
Step 600
600
#4A7A95
oklch(55.6% 0.067 234.4)
-
Step 700
700 (this color)
#37637B
oklch(47.8% 0.062 234)
-
Step 800
800
#315467
oklch(42.8% 0.051 233.5)
-
Step 900
900
#2C4554
oklch(37.7% 0.04 235.6)
-
Step 950
950
#1A2931
oklch(27.1% 0.025 232.2)
#37637B 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) | #58627C | 0.041 |
| Deuteranopia (no green cones) | #4E5B7B | 0.035 |
| Tritanopia (no blue cones) | #0A696B | 0.047 |
| Achromatopsia (no color) | #5E5E5E | 0.062 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37637B
#37637B
oklch(47.8% 0.062 234)
- #79533B
#79533B
oklch(47.8% 0.063 53)
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 #37637B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- YInMn Blue #415A77 ΔE 0.027
- Denim #3B638C ΔE 0.029
- Slate #516572 ΔE 0.035
- Light Navy Blue #2E5A88 ΔE 0.041
- Dusty Grape #545775 ΔE 0.047
- Peacock Blue #016795 ΔE 0.047
- Petrol #005F6A ΔE 0.048
- Dark Aqua #05696B ΔE 0.048
Use #37637B 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.