#37657E
Closest named color: Denim (#3B638C). oklch(48.5% 0.065 234), rgb(55, 101, 126).
Aa
White text reads best on this color (6.31:1).
About this color
#37657E is a medium-dark, muted blue. In OKLCH its lightness is 48%, its chroma 0.065 and its hue 234°. 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 6.31:1.
| Hue family | Blues |
| Lightness | medium-dark (48%) |
| Chroma | muted (0.065) |
| Temperature | cool |
| Nearest name | Denim (#3B638C) |
| Black text | 3.32:1 |
| White text | 6.31:1 |
Values
| HEX | #37657E |
| RGB | rgb(55, 101, 126) |
| HSL | hsl(201, 39%, 35%) |
| OKLCH | oklch(48.5% 0.065 234) |
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 #37657E | 6.31:1 | AA | Lc -86.4 | Fine for body text |
| Black text on #37657E | 3.32:1 | AA large text | Lc 22.7 | Dividers and decoration only |
| #37657E text on white | 6.31:1 | AA | Lc 81.3 | Fine for body text |
| #37657E text on black | 3.32:1 | AA large text | Lc -20.6 | 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 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
#AEC4D2
oklch(80.8% 0.031 235.7)
-
Step 400
400
#82A6BB
oklch(70.6% 0.05 234)
-
Step 500
500
#6290AB
oklch(63.1% 0.064 234.9)
-
Step 600
600
#487A96
oklch(55.6% 0.069 234.5)
-
Step 700
700 (this color)
#37657E
oklch(48.5% 0.065 234)
-
Step 800
800
#305468
oklch(42.7% 0.053 234.2)
-
Step 900
900
#2B4554
oklch(37.6% 0.041 234.7)
-
Step 950
950
#192931
oklch(27% 0.026 230.6)
#37657E 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) | #59647F | 0.042 |
| Deuteranopia (no green cones) | #4F5C7E | 0.037 |
| Tritanopia (no blue cones) | #026C6D | 0.050 |
| Achromatopsia (no color) | #606060 | 0.065 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37657E
#37657E
oklch(48.5% 0.065 234)
- #7C553B
#7C553B
oklch(48.5% 0.065 54.3)
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 #37657E, 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 0.033
- Slate #516572 ΔE 0.034
- Light Navy Blue #2E5A88 ΔE 0.043
- Peacock Blue #016795 ΔE 0.043
- Dusky Blue #475F94 ΔE 0.048
- Dark Aqua #05696B ΔE 0.049
- Dusty Grape #545775 ΔE 0.050
Use #37657E 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.